ERROR: (device loop3): dbUpdatePMap: blocks are outside the map blkno = 6161616161, nblocks = 616161 ERROR: (device loop3): dbUpdatePMap: blocks are outside the map blkno = 6c00003065, nblocks = 69662f ERROR: (device loop3): dbUpdatePMap: blocks are outside the map ================================================================== BUG: KASAN: slab-use-after-free in txAllocPMap+0x47f/0x6b0 fs/jfs/jfs_txnmgr.c:2412 Read of size 1 at addr ffff88805d465000 by task jfsCommit/114 CPU: 0 PID: 114 Comm: jfsCommit Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 txAllocPMap+0x47f/0x6b0 fs/jfs/jfs_txnmgr.c:2412 txUpdateMap+0x2b7/0x8b0 fs/jfs/jfs_txnmgr.c:2309 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline] jfs_lazycommit+0x439/0xaa0 fs/jfs/jfs_txnmgr.c:2733 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Allocated by task 49: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] kmem_cache_alloc_node+0x1af/0x310 mm/slub.c:3540 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643 alloc_skb include/linux/skbuff.h:1316 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline] nsim_dev_trap_report_work+0x253/0xa90 drivers/net/netdevsim/dev.c:851 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Freed by task 49: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] kmem_cache_free+0xf8/0x290 mm/slub.c:3852 nsim_dev_trap_report drivers/net/netdevsim/dev.c:821 [inline] nsim_dev_trap_report_work+0x723/0xa90 drivers/net/netdevsim/dev.c:851 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 The buggy address belongs to the object at ffff88805d465000 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 0 bytes inside of freed 240-byte region [ffff88805d465000, ffff88805d4650f0) The buggy address belongs to the physical page: page:ffffea0001751940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5d465 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888141a65640 ffffea0001751900 0000000000000006 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 3485, tgid 3485 (kworker/u4:10), ts 85547291107, free_ts 29734613213 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582 prep_new_page mm/page_alloc.c:1589 [inline] get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501 alloc_slab_page+0x5d/0x180 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] kmem_cache_alloc_node+0x12e/0x310 mm/slub.c:3540 __alloc_skb+0x103/0x2c0 net/core/skbuff.c:643 alloc_skb include/linux/skbuff.h:1316 [inline] nlmsg_new include/net/netlink.h:1010 [inline] inet6_rt_notify+0xb4/0x240 net/ipv6/route.c:6250 fib6_add_rt2node net/ipv6/ip6_fib.c:1274 [inline] fib6_add+0x1e1a/0x49d0 net/ipv6/ip6_fib.c:1503 __ip6_ins_rt net/ipv6/route.c:1356 [inline] ip6_ins_rt+0xd7/0x130 net/ipv6/route.c:1366 __ipv6_ifa_notify+0x662/0xb40 net/ipv6/addrconf.c:6279 ipv6_ifa_notify net/ipv6/addrconf.c:6318 [inline] addrconf_dad_completed+0x1a2/0xd90 net/ipv6/addrconf.c:4307 addrconf_dad_work+0xc9e/0x1550 net/ipv6/addrconf.c:-1 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459 free_contig_range+0xa1/0x150 mm/page_alloc.c:6421 destroy_args+0x7d/0x840 mm/debug_vm_pgtable.c:1015 debug_vm_pgtable+0x411/0x440 mm/debug_vm_pgtable.c:1400 do_one_initcall+0x242/0x790 init/main.c:1249 do_initcall_level+0x13d/0x1f0 init/main.c:1311 do_initcalls+0x69/0xd0 init/main.c:1327 kernel_init_freeable+0x3d9/0x560 init/main.c:1564 kernel_init+0x1d/0x1c0 init/main.c:1454 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Memory state around the buggy address: ffff88805d464f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805d464f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805d465000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805d465080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff88805d465100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================