BUG: Bad page state in process syz.3.1623  pfn:57cbb
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888057cbba00 pfn:0x57cbb
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: ffff888057cbba00 3fffffffffffffff 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499861566, free_ts 275267548206
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmems net/core/page_pool.c:663 [inline]
 page_pool_alloc_frag_netmem+0x421/0x9b0 net/core/page_pool.c:1072
 page_pool_alloc_netmem include/net/page_pool/helpers.h:131 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb69/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:2fe03
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802fe03140 pfn:0x2fe03
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: ffff88802fe03140 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499841380, free_ts 275267615109
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:583ce
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880583ce140 pfn:0x583ce
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: ffff8880583ce140 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499822020, free_ts 275267682210
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:59726
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888059726b40 pfn:0x59726
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: ffff888059726b40 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499802609, free_ts 275267749100
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:774a2
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880774a2dc0 pfn:0x774a2
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: ffff8880774a2dc0 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499783461, free_ts 275267818426
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:2e1ab
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888000000000 pfn:0x2e1ab
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: ffff888000000000 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499764225, free_ts 275267885687
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:7ef1a
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x345 pfn:0x7ef1a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: 0000000000000345 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499744949, free_ts 275267952488
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:213a3
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x200000000 pfn:0x213a3
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: 0000000200000000 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499725437, free_ts 275268019219
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:57ce4
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x57ce4
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: 0000000000000000 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499706117, free_ts 275268085960
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:326fa
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x326fa
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: 0000000000000000 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499687052, free_ts 275268152424
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:78a4a
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888000000000 pfn:0x78a4a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: ffff888000000000 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499668059, free_ts 275268219832
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>
BUG: Bad page state in process syz.3.1623  pfn:59e31
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x59e31
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000040 ffff8880212a3000 0000000000000000
raw: 0000000000000000 0000000000000001 00000000ffffffff 0000000000000000
page dumped because: page_pool leak
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2820(GFP_ATOMIC|__GFP_NOWARN), pid 11478, tgid 11477 (syz.3.1623), ts 275499648732, free_ts 275268287906
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1845
 prep_new_page mm/page_alloc.c:1853 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3879
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5178
 __alloc_pages_noprof mm/page_alloc.c:5212 [inline]
 alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5132
 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline]
 __page_pool_alloc_netmems_slow+0x14c/0x710 net/core/page_pool.c:612
 page_pool_alloc_netmem include/net/page_pool/helpers.h:128 [inline]
 page_pool_alloc include/net/page_pool/helpers.h:167 [inline]
 page_pool_dev_alloc include/net/page_pool/helpers.h:188 [inline]
 skb_pp_cow_data+0xb47/0x13e0 net/core/skbuff.c:952
 netif_skb_check_for_xdp net/core/dev.c:5429 [inline]
 netif_receive_generic_xdp net/core/dev.c:5470 [inline]
 do_xdp_generic+0x699/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 7286 tgid 7286 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901
 vfree+0x25a/0x400 mm/vmalloc.c:3440
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Modules linked in:
CPU: 1 UID: 0 PID: 11478 Comm: syz.3.1623 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 bad_page+0x180/0x1c0 mm/page_alloc.c:649
 free_page_is_bad mm/page_alloc.c:1082 [inline]
 free_pages_prepare mm/page_alloc.c:1386 [inline]
 __free_frozen_pages+0xce2/0xd30 mm/page_alloc.c:2901
 bpf_xdp_shrink_data net/core/filter.c:4191 [inline]
 bpf_xdp_frags_shrink_tail+0x4f7/0x7f0 net/core/filter.c:4215
 ____bpf_xdp_adjust_tail net/core/filter.c:4237 [inline]
 bpf_xdp_adjust_tail+0x1d6/0x220 net/core/filter.c:4230
 bpf_prog_5d7dc57dfd7f985a+0x1e/0x24
 __bpf_prog_run include/linux/filter.h:721 [inline]
 bpf_prog_run_xdp include/net/xdp.h:696 [inline]
 bpf_prog_run_generic_xdp+0x606/0x13d0 net/core/dev.c:5360
 netif_receive_generic_xdp net/core/dev.c:5476 [inline]
 do_xdp_generic+0x9f7/0x11a0 net/core/dev.c:5538
 tun_get_user+0x2527/0x3e90 drivers/net/tun.c:1872
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2d878e1ff
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fa2d95b2000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa2d89e5fa0 RCX: 00007fa2d878e1ff
RDX: 000000000000fdef RSI: 00002000000003c0 RDI: 00000000000000c8
RBP: 00007fa2d8813f91 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000
R13: 00007fa2d89e6038 R14: 00007fa2d89e5fa0 R15: 00007ffcb1f1fe18
 </TASK>