syzbot
general protection fault in p9_client_destroy
Status:
premoderation: reported on 2026/09/13 23:42
Reported-by: syzbot+b1c08e630e344746cc7e@syzkaller.appspotmail.com
First crash: 8d10h, last: 8d10h
Sample crash report:
general protection fault, probably for non-canonical address 0xe0ffff8881205622: 0000 [#1] PREEMPT SMP KASAN
KASAN: maybe wild-memory-access in range [0x08001c440902b110-0x08001c440902b117]
CPU: 1 PID: 1495 Comm: syz-executor Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:qlist_move_cache mm/kasan/quarantine.c:299 [inline]
RIP: 0010:kasan_quarantine_remove_cache+0xe6/0x1f0 mm/kasan/quarantine.c:348
Code: 00 00 80 7f 77 00 00 eb 21 8b 7f 18 49 89 10 48 89 51 08 48 c7 02 00 00 00 00 48 01 79 10 48 89 f2 48 85 f6 0f 84 68 ff ff ff <48> 8b 32 4c 89 d7 4c 39 ca 76 07 48 8b 3d 68 25 b8 04 48 01 d7 48
RSP: 0018:ffffc90000a37c08 EFLAGS: 00010086
RAX: 0000000000000a02 RBX: ffff88810fda2180 RCX: ffffffff87102050
RDX: e0ffff8881205622 RSI: e0ffff8881205622 RDI: 0000000000001100
RBP: ffffc90000a37c30 R08: ffff8881075aa000 R09: ffffffff7fffffff
R10: 0000777f80000000 R11: fffff52000146f6c R12: ffffea0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000010e
FS: 0000555589a5a500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555589a7d948 CR3: 000000012c55d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kasan_cache_shutdown+0x19/0x20 mm/kasan/generic.c:207
shutdown_cache mm/slab_common.c:464 [inline]
kmem_cache_destroy+0x48/0x140 mm/slab_common.c:512
p9_client_destroy+0x3bc/0x410 net/9p/client.c:1112
v9fs_session_close+0x4e/0x1c0 fs/9p/v9fs.c:501
v9fs_kill_super+0x5c/0x90 fs/9p/vfs_super.c:226
deactivate_locked_super+0xa0/0x100 fs/super.c:335
deactivate_super+0xaf/0xe0 fs/super.c:366
cleanup_mnt+0x44f/0x500 fs/namespace.c:1149
__cleanup_mnt+0x19/0x20 fs/namespace.c:1156
task_work_run+0x127/0x190 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f8246667397
Code: a2 c7 05 5c 43 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffcc0478298 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f8246667397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcc0478350
RBP: 00007ffcc0478350 R08: 00007ffcc0479350 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcc04793e0
R13: 00007f82466fc48b R14: 000000000001e1b9 R15: 00007ffcc0479420
</TASK>
Modules linked in:
---[ end trace c4673ad2eeda4ee4 ]---
RIP: 0010:qlist_move_cache mm/kasan/quarantine.c:299 [inline]
RIP: 0010:kasan_quarantine_remove_cache+0xe6/0x1f0 mm/kasan/quarantine.c:348
Code: 00 00 80 7f 77 00 00 eb 21 8b 7f 18 49 89 10 48 89 51 08 48 c7 02 00 00 00 00 48 01 79 10 48 89 f2 48 85 f6 0f 84 68 ff ff ff <48> 8b 32 4c 89 d7 4c 39 ca 76 07 48 8b 3d 68 25 b8 04 48 01 d7 48
RSP: 0018:ffffc90000a37c08 EFLAGS: 00010086
RAX: 0000000000000a02 RBX: ffff88810fda2180 RCX: ffffffff87102050
RDX: e0ffff8881205622 RSI: e0ffff8881205622 RDI: 0000000000001100
RBP: ffffc90000a37c30 R08: ffff8881075aa000 R09: ffffffff7fffffff
R10: 0000777f80000000 R11: fffff52000146f6c R12: ffffea0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000010e
FS: 0000555589a5a500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555589a7d948 CR3: 000000012c55d000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 80 7f 77 00 cmpb $0x0,0x77(%rdi)
6: 00 eb add %ch,%bl
8: 21 8b 7f 18 49 89 and %ecx,-0x76b6e781(%rbx)
e: 10 48 89 adc %cl,-0x77(%rax)
11: 51 push %rcx
12: 08 48 c7 or %cl,-0x39(%rax)
15: 02 00 add (%rax),%al
17: 00 00 add %al,(%rax)
19: 00 48 01 add %cl,0x1(%rax)
1c: 79 10 jns 0x2e
1e: 48 89 f2 mov %rsi,%rdx
21: 48 85 f6 test %rsi,%rsi
24: 0f 84 68 ff ff ff je 0xffffff92
* 2a: 48 8b 32 mov (%rdx),%rsi <-- trapping instruction
2d: 4c 89 d7 mov %r10,%rdi
30: 4c 39 ca cmp %r9,%rdx
33: 76 07 jbe 0x3c
35: 48 8b 3d 68 25 b8 04 mov 0x4b82568(%rip),%rdi # 0x4b825a4
3c: 48 01 d7 add %rdx,%rdi
3f: 48 rex.W
* Struck through repros no longer work on HEAD.