[v6.6] KASAN: slab-use-after-free Read in xfrm_state_find
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syzbot
Aug 28, 2025, 2:56:30 PM8/28/25
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: cc1a1c5b404a Linux 6.6.103
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13363c62580000
kernel config: https://syzkaller.appspot.com/x/.config?x=412020841cf033b0
dashboard link: https://syzkaller.appspot.com/bug?extid=28994dee2bd7c56dd1e0
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/46c06862a545/disk-cc1a1c5b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/38ddabb6fc8b/vmlinux-cc1a1c5b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b130b7d031b5/bzImage-cc1a1c5b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+28994d...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __xfrm_state_lookup_all net/xfrm/xfrm_state.c:-1 [inline]
BUG: KASAN: slab-use-after-free in xfrm_state_find+0x2635/0x4510 net/xfrm/xfrm_state.c:1284
Read of size 1 at addr ffff88802d4b12f8 by task syz.1.4358/16762
CPU: 1 PID: 16762 Comm: syz.1.4358 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
<TASK>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xac/0x220 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
__xfrm_state_lookup_all net/xfrm/xfrm_state.c:-1 [inline]
xfrm_state_find+0x2635/0x4510 net/xfrm/xfrm_state.c:1284
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2502 [inline]
xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2547 [inline]
xfrm_resolve_and_create_bundle+0x727/0x2c20 net/xfrm/xfrm_policy.c:2841
xfrm_bundle_lookup net/xfrm/xfrm_policy.c:3076 [inline]
xfrm_lookup_with_ifid+0x556/0x19c0 net/xfrm/xfrm_policy.c:3207
xfrm_lookup net/xfrm/xfrm_policy.c:3304 [inline]
xfrm_lookup_route+0x3c/0x1b0 net/xfrm/xfrm_policy.c:3315
vti_xmit net/ipv4/ip_vti.c:214 [inline]
vti_tunnel_xmit+0x424/0x1770 net/ipv4/ip_vti.c:304
__netdev_start_xmit include/linux/netdevice.h:4943 [inline]
netdev_start_xmit include/linux/netdevice.h:4957 [inline]
xmit_one net/core/dev.c:3619 [inline]
dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3635
__dev_queue_xmit+0x1a64/0x35a0 net/core/dev.c:4425
dev_queue_xmit include/linux/netdevice.h:3113 [inline]
__bpf_tx_skb+0x189/0x250 net/core/filter.c:2145
____bpf_clone_redirect net/core/filter.c:2471 [inline]
bpf_clone_redirect+0x270/0x3d0 net/core/filter.c:2441
bpf_prog_c9d58f5b8698340d+0x5e/0x63
bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline]
__bpf_prog_run include/linux/filter.h:612 [inline]
bpf_prog_run include/linux/filter.h:619 [inline]
bpf_test_run+0x2c7/0x810 net/bpf/test_run.c:424
bpf_prog_test_run_skb+0xa67/0x11c0 net/bpf/test_run.c:1050
bpf_prog_test_run+0x321/0x390 kernel/bpf/syscall.c:4123
__sys_bpf+0x440/0x800 kernel/bpf/syscall.c:5485
__do_sys_bpf kernel/bpf/syscall.c:5571 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5569 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f70ca18ebe9
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:00007f70cafd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f70ca3b5fa0 RCX: 00007f70ca18ebe9
RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a
RBP: 00007f70ca211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70ca3b6038 R14: 00007f70ca3b5fa0 R15: 00007ffd798cf018
</TASK>
Allocated by task 14457:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
xfrm_alloc_userspi+0x57a/0xa90 net/xfrm/xfrm_user.c:1613
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff88802d4b1000
which belongs to the cache xfrm_state of size 848
The buggy address is located 760 bytes inside of
freed 848-byte region [ffff88802d4b1000, ffff88802d4b1350)
The buggy address belongs to the physical page:
page:ffffea0000b52c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802d4b0800 pfn:0x2d4b0
head:ffffea0000b52c00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888141a56dc0 dead000000000122 0000000000000000
raw: ffff88802d4b0800 000000008010000c 00000001ffffffff 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 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 10232, tgid 10231 (syz.3.1754), ts 293669492800, free_ts 293520530189
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
prep_new_page mm/page_alloc.c:1561 [inline]
get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
__alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
alloc_slab_page+0x5d/0x170 mm/slub.c:1876
allocate_slab mm/slub.c:2023 [inline]
new_slab+0x87/0x2e0 mm/slub.c:2076
___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
__slab_alloc mm/slub.c:3329 [inline]
__slab_alloc_node mm/slub.c:3382 [inline]
slab_alloc_node mm/slub.c:3475 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x1b7/0x2e0 mm/slub.c:3509
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
xfrm_state_construct net/xfrm/xfrm_user.c:689 [inline]
xfrm_add_sa+0xfe5/0x30a0 net/xfrm/xfrm_user.c:799
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1154 [inline]
free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
free_large_kmalloc+0x101/0x1a0 mm/slab_common.c:984
bpf_check+0x62c6/0xe970 kernel/bpf/verifier.c:20555
bpf_prog_load+0x11cb/0x16d0 kernel/bpf/syscall.c:2744
__sys_bpf+0x55a/0x800 kernel/bpf/syscall.c:5467
__do_sys_bpf kernel/bpf/syscall.c:5571 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5569 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff88802d4b1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802d4b1200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802d4b1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802d4b1300: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
ffff88802d4b1380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: cc1a1c5b404a Linux 6.6.103
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=13363c62580000
kernel config: https://syzkaller.appspot.com/x/.config?x=412020841cf033b0
dashboard link: https://syzkaller.appspot.com/bug?extid=28994dee2bd7c56dd1e0
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/46c06862a545/disk-cc1a1c5b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/38ddabb6fc8b/vmlinux-cc1a1c5b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b130b7d031b5/bzImage-cc1a1c5b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+28994d...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __xfrm_state_lookup_all net/xfrm/xfrm_state.c:-1 [inline]
BUG: KASAN: slab-use-after-free in xfrm_state_find+0x2635/0x4510 net/xfrm/xfrm_state.c:1284
Read of size 1 at addr ffff88802d4b12f8 by task syz.1.4358/16762
CPU: 1 PID: 16762 Comm: syz.1.4358 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
<TASK>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xac/0x220 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
__xfrm_state_lookup_all net/xfrm/xfrm_state.c:-1 [inline]
xfrm_state_find+0x2635/0x4510 net/xfrm/xfrm_state.c:1284
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2502 [inline]
xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2547 [inline]
xfrm_resolve_and_create_bundle+0x727/0x2c20 net/xfrm/xfrm_policy.c:2841
xfrm_bundle_lookup net/xfrm/xfrm_policy.c:3076 [inline]
xfrm_lookup_with_ifid+0x556/0x19c0 net/xfrm/xfrm_policy.c:3207
xfrm_lookup net/xfrm/xfrm_policy.c:3304 [inline]
xfrm_lookup_route+0x3c/0x1b0 net/xfrm/xfrm_policy.c:3315
vti_xmit net/ipv4/ip_vti.c:214 [inline]
vti_tunnel_xmit+0x424/0x1770 net/ipv4/ip_vti.c:304
__netdev_start_xmit include/linux/netdevice.h:4943 [inline]
netdev_start_xmit include/linux/netdevice.h:4957 [inline]
xmit_one net/core/dev.c:3619 [inline]
dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3635
__dev_queue_xmit+0x1a64/0x35a0 net/core/dev.c:4425
dev_queue_xmit include/linux/netdevice.h:3113 [inline]
__bpf_tx_skb+0x189/0x250 net/core/filter.c:2145
____bpf_clone_redirect net/core/filter.c:2471 [inline]
bpf_clone_redirect+0x270/0x3d0 net/core/filter.c:2441
bpf_prog_c9d58f5b8698340d+0x5e/0x63
bpf_dispatcher_nop_func include/linux/bpf.h:1213 [inline]
__bpf_prog_run include/linux/filter.h:612 [inline]
bpf_prog_run include/linux/filter.h:619 [inline]
bpf_test_run+0x2c7/0x810 net/bpf/test_run.c:424
bpf_prog_test_run_skb+0xa67/0x11c0 net/bpf/test_run.c:1050
bpf_prog_test_run+0x321/0x390 kernel/bpf/syscall.c:4123
__sys_bpf+0x440/0x800 kernel/bpf/syscall.c:5485
__do_sys_bpf kernel/bpf/syscall.c:5571 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5569 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f70ca18ebe9
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:00007f70cafd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f70ca3b5fa0 RCX: 00007f70ca18ebe9
RDX: 000000000000002c RSI: 0000200000000080 RDI: 000000000000000a
RBP: 00007f70ca211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f70ca3b6038 R14: 00007f70ca3b5fa0 R15: 00007ffd798cf018
</TASK>
Allocated by task 14457:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
xfrm_alloc_userspi+0x57a/0xa90 net/xfrm/xfrm_user.c:1613
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff88802d4b1000
which belongs to the cache xfrm_state of size 848
The buggy address is located 760 bytes inside of
freed 848-byte region [ffff88802d4b1000, ffff88802d4b1350)
The buggy address belongs to the physical page:
page:ffffea0000b52c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802d4b0800 pfn:0x2d4b0
head:ffffea0000b52c00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888141a56dc0 dead000000000122 0000000000000000
raw: ffff88802d4b0800 000000008010000c 00000001ffffffff 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 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 10232, tgid 10231 (syz.3.1754), ts 293669492800, free_ts 293520530189
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
prep_new_page mm/page_alloc.c:1561 [inline]
get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
__alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
alloc_slab_page+0x5d/0x170 mm/slub.c:1876
allocate_slab mm/slub.c:2023 [inline]
new_slab+0x87/0x2e0 mm/slub.c:2076
___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
__slab_alloc mm/slub.c:3329 [inline]
__slab_alloc_node mm/slub.c:3382 [inline]
slab_alloc_node mm/slub.c:3475 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x1b7/0x2e0 mm/slub.c:3509
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
xfrm_state_construct net/xfrm/xfrm_user.c:689 [inline]
xfrm_add_sa+0xfe5/0x30a0 net/xfrm/xfrm_user.c:799
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1154 [inline]
free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
free_large_kmalloc+0x101/0x1a0 mm/slab_common.c:984
bpf_check+0x62c6/0xe970 kernel/bpf/verifier.c:20555
bpf_prog_load+0x11cb/0x16d0 kernel/bpf/syscall.c:2744
__sys_bpf+0x55a/0x800 kernel/bpf/syscall.c:5467
__do_sys_bpf kernel/bpf/syscall.c:5571 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5569 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5569
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff88802d4b1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802d4b1200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802d4b1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802d4b1300: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
ffff88802d4b1380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
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syzbot
Dec 10, 2025, 12:12:17 PM12/10/25
to syzkaller...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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