Illegal XDP return value 38 on prog  (id 41) dev N/A, expect packet loss!
==================================================================
BUG: KASAN: slab-use-after-free in ipv6_addr_equal include/net/ipv6.h:673 [inline]
BUG: KASAN: slab-use-after-free in ip6gre_xmit_ipv6 net/ipv6/ip6_gre.c:862 [inline]
BUG: KASAN: slab-use-after-free in ip6gre_tunnel_xmit+0x6e8/0x15b0 net/ipv6/ip6_gre.c:925
Read of size 8 at addr ffff88807cd0f3dc by task syz.0.118/6329

CPU: 0 UID: 0 PID: 6329 Comm: syz.0.118 Not tainted 6.14.0-rc2-syzkaller-00159-g07b598c0e6f0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:489
 kasan_report+0x143/0x180 mm/kasan/report.c:602
 ipv6_addr_equal include/net/ipv6.h:673 [inline]
 ip6gre_xmit_ipv6 net/ipv6/ip6_gre.c:862 [inline]
 ip6gre_tunnel_xmit+0x6e8/0x15b0 net/ipv6/ip6_gre.c:925
 __netdev_start_xmit include/linux/netdevice.h:5150 [inline]
 netdev_start_xmit include/linux/netdevice.h:5159 [inline]
 xmit_one net/core/dev.c:3735 [inline]
 dev_hard_start_xmit+0x27a/0x7d0 net/core/dev.c:3751
 sch_direct_xmit+0x29c/0x5d0 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:3974 [inline]
 __dev_queue_xmit+0x1a8f/0x3f50 net/core/dev.c:4550
 packet_snd net/packet/af_packet.c:3132 [inline]
 packet_sendmsg+0x4ed5/0x6c30 net/packet/af_packet.c:3164
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:733
 __sys_sendto+0x363/0x4c0 net/socket.c:2187
 __do_sys_sendto net/socket.c:2194 [inline]
 __se_sys_sendto net/socket.c:2190 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2190
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f511598cde9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f511684b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f5115ba6080 RCX: 00007f511598cde9
RDX: 0000000000000028 RSI: 0000400000000180 RDI: 0000000000000003
RBP: 00007f5115a0e2a0 R08: 0000400000000140 R09: 0000000000000014
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5115ba6080 R15: 00007fffde1cdd28
 </TASK>

Allocated by task 6329:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4115 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_node_noprof+0x1d9/0x380 mm/slub.c:4216
 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:587
 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678
 alloc_skb include/linux/skbuff.h:1331 [inline]
 alloc_skb_with_frags+0xc3/0x820 net/core/skbuff.c:6612
 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2897
 packet_alloc_skb net/packet/af_packet.c:2981 [inline]
 packet_snd net/packet/af_packet.c:3075 [inline]
 packet_sendmsg+0x4080/0x6c30 net/packet/af_packet.c:3164
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:733
 __sys_sendto+0x363/0x4c0 net/socket.c:2187
 __do_sys_sendto net/socket.c:2194 [inline]
 __se_sys_sendto net/socket.c:2190 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2190
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 6329:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2353 [inline]
 slab_free mm/slub.c:4609 [inline]
 kmem_cache_free+0x195/0x410 mm/slub.c:4711
 skb_kfree_head net/core/skbuff.c:1084 [inline]
 skb_free_head net/core/skbuff.c:1098 [inline]
 skb_release_data+0x677/0x8a0 net/core/skbuff.c:1125
 skb_release_all net/core/skbuff.c:1190 [inline]
 __kfree_skb net/core/skbuff.c:1204 [inline]
 sk_skb_reason_drop+0x1c9/0x380 net/core/skbuff.c:1242
 packet_rcv+0x16f/0x14b0 net/packet/af_packet.c:2277
 dev_queue_xmit_nit+0xb6e/0xca0 net/core/dev.c:2492
 xmit_one net/core/dev.c:3731 [inline]
 dev_hard_start_xmit+0x15f/0x7d0 net/core/dev.c:3751
 sch_direct_xmit+0x29c/0x5d0 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:3974 [inline]
 __dev_queue_xmit+0x1a8f/0x3f50 net/core/dev.c:4550
 packet_snd net/packet/af_packet.c:3132 [inline]
 packet_sendmsg+0x4ed5/0x6c30 net/packet/af_packet.c:3164
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:733
 __sys_sendto+0x363/0x4c0 net/socket.c:2187
 __do_sys_sendto net/socket.c:2194 [inline]
 __se_sys_sendto net/socket.c:2190 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2190
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88807cd0f300
 which belongs to the cache skbuff_small_head of size 640
The buggy address is located 220 bytes inside of
 freed 640-byte region [ffff88807cd0f300, ffff88807cd0f580)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7cd0c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801f6d6280 ffffea0000b36600 dead000000000002
raw: 0000000000000000 0000000080150015 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801f6d6280 ffffea0000b36600 dead000000000002
head: 0000000000000000 0000000080150015 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001f34301 ffffffffffffffff 0000000000000000
head: ffff888000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5206, tgid 5206 (udevd), ts 32135872098, free_ts 27312643794
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739
 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab+0x8f/0x3a0 mm/slub.c:2587
 new_slab mm/slub.c:2640 [inline]
 ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826
 __slab_alloc+0x58/0xa0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 kmem_cache_alloc_node_noprof+0x269/0x380 mm/slub.c:4216
 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:587
 __alloc_skb+0x1f3/0x440 net/core/skbuff.c:678
 netlink_sendmsg+0x634/0xcb0 net/netlink/af_netlink.c:1867
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:733
 ____sys_sendmsg+0x53a/0x860 net/socket.c:2573
 ___sys_sendmsg net/socket.c:2627 [inline]
 __sys_sendmsg+0x269/0x350 net/socket.c:2659
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 16 tgid 16 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660
 pagetable_free include/linux/mm.h:2917 [inline]
 pagetable_dtor_free include/linux/mm.h:3015 [inline]
 __tlb_remove_table+0x33c/0x420 include/asm-generic/tlb.h:216
 __tlb_remove_table_free mm/mmu_gather.c:227 [inline]
 tlb_remove_table_rcu+0x76/0xf0 mm/mmu_gather.c:282
 rcu_do_batch kernel/rcu/tree.c:2546 [inline]
 rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2802
 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
 run_ksoftirqd+0xca/0x130 kernel/softirq.c:950
 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff88807cd0f280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807cd0f300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807cd0f380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff88807cd0f400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807cd0f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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