syzbot
INFO: trying to register non-static key in net_passive_dec
Status:
upstream: reported C repro on 2026/10/20 19:51
Reported-by: syzbot+d214378994a877e9934c@syzkaller.appspotmail.com
First crash: 23d, last: 7h33m
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Bug presence (1)
| Date |
Name |
Commit |
Repro |
Result |
| 2026/11/11 |
upstream (ToT) |
[unknown] |
C
|
Failed due to an error; will retry later
|
Sample crash report:
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 0 PID: 5981 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
assign_lock_key+0x205/0x240 kernel/locking/lockdep.c:1004
register_lock_class+0x221/0x8a0 kernel/locking/lockdep.c:1317
__lock_acquire+0x27b/0x7eb0 kernel/locking/lockdep.c:5048
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xb4/0x100 kernel/locking/spinlock.c:162
ref_tracker_dir_exit+0x5a/0x510 lib/ref_tracker.c:164
net_passive_dec+0xc6/0x120 net/core/net_namespace.c:479
copy_net_ns+0x427/0x530 net/core/net_namespace.c:534
create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:228
ksys_unshare+0x4fa/0x8f0 kernel/fork.c:3444
__do_sys_unshare kernel/fork.c:3518 [inline]
__se_sys_unshare kernel/fork.c:3516 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3516
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa6b799f559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa6b88a7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fa6b7c26090 RCX: 00007fa6b799f559
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000064000400
RBP: 00007fa6b7a36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa6b7c26128 R14: 00007fa6b7c26090 R15: 00007fff37ac89c8
</TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5981 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:ref_tracker_dir_exit+0xbf/0x510 lib/ref_tracker.c:165
Code: 01 00 00 48 83 c1 40 48 8d 43 22 48 89 44 24 10 48 89 4c 24 08 48 c1 e9 03 48 89 4c 24 28 48 89 6c 24 20 4d 89 ec 49 c1 ec 03 <43> 80 3c 34 00 74 08 4c 89 ef e8 12 10 7f fd 4d 8b 7d 00 4c 89 ef
RSP: 0018:ffffc9000338fc10 EFLAGS: 00010046
RAX: dead000000000122 RBX: dead000000000100 RCX: 1ffff1100f8797b3
RDX: ffff88807c3cbd60 RSI: 0000000000000004 RDI: ffffc9000338fb00
RBP: ffff88807c3cbdb8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000671f60 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: dffffc0000000000
FS: 00007fa6b88a76c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa6b88a6ff8 CR3: 00000000249f8000 CR4: 00000000003506f0
Call Trace:
<TASK>
net_passive_dec+0xc6/0x120 net/core/net_namespace.c:479
copy_net_ns+0x427/0x530 net/core/net_namespace.c:534
create_new_namespaces+0x3ce/0x700 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11a/0x160 kernel/nsproxy.c:228
ksys_unshare+0x4fa/0x8f0 kernel/fork.c:3444
__do_sys_unshare kernel/fork.c:3518 [inline]
__se_sys_unshare kernel/fork.c:3516 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3516
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa6b799f559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa6b88a7028 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fa6b7c26090 RCX: 00007fa6b799f559
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000064000400
RBP: 00007fa6b7a36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa6b7c26128 R14: 00007fa6b7c26090 R15: 00007fff37ac89c8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ref_tracker_dir_exit+0xbf/0x510 lib/ref_tracker.c:165
Code: 01 00 00 48 83 c1 40 48 8d 43 22 48 89 44 24 10 48 89 4c 24 08 48 c1 e9 03 48 89 4c 24 28 48 89 6c 24 20 4d 89 ec 49 c1 ec 03 <43> 80 3c 34 00 74 08 4c 89 ef e8 12 10 7f fd 4d 8b 7d 00 4c 89 ef
RSP: 0018:ffffc9000338fc10 EFLAGS: 00010046
RAX: dead000000000122 RBX: dead000000000100 RCX: 1ffff1100f8797b3
RDX: ffff88807c3cbd60 RSI: 0000000000000004 RDI: ffffc9000338fb00
RBP: ffff88807c3cbdb8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000671f60 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: dffffc0000000000
FS: 00007fa6b88a76c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa6b88a6ff8 CR3: 00000000249f8000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
0: 01 00 add %eax,(%rax)
2: 00 48 83 add %cl,-0x7d(%rax)
5: c1 40 48 8d roll $0x8d,0x48(%rax)
9: 43 22 48 89 rex.XB and -0x77(%r8),%cl
d: 44 24 10 rex.R and $0x10,%al
10: 48 89 4c 24 08 mov %rcx,0x8(%rsp)
15: 48 c1 e9 03 shr $0x3,%rcx
19: 48 89 4c 24 28 mov %rcx,0x28(%rsp)
1e: 48 89 6c 24 20 mov %rbp,0x20(%rsp)
23: 4d 89 ec mov %r13,%r12
26: 49 c1 ec 03 shr $0x3,%r12
* 2a: 43 80 3c 34 00 cmpb $0x0,(%r12,%r14,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ef mov %r13,%rdi
34: e8 12 10 7f fd call 0xfd7f104b
39: 4d 8b 7d 00 mov 0x0(%r13),%r15
3d: 4c 89 ef mov %r13,%rdi
Struck through repros no longer work on HEAD.