syzbot
WARNING: ODEBUG bug in do_work
Status:
moderation: reported on 2026/10/15 17:25
Subsystems:
greybus
Labels:
prio:high
[Documentation on labels]
Reported-by: syzbot+e6bea924b5ee24f7cb98@syzkaller.appspotmail.com
First crash: 6d16h, last: 1d13h
Sample crash report:
greybus 2-svc: Resetting the greybus network, watch out!!!
------------[ cut here ]------------
ODEBUG: init active (active state 0) object: ffffffff9bda1f68 object type: timer_list hint: greybus_reset+0x0/0x50 usercopy_64.c:-1
WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#1: kworker/1:1/30
Modules linked in:
CPU: 1 UID: 0 PID: 30 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
Workqueue: events do_work
RIP: 0010:debug_print_object+0x18a/0x230 lib/debugobjects.c:629
Code: f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 4d 99 4c fd 4d 8b 0f 4c 89 ef 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f0 ff 34 24 <67> 48 0f b9 3a 48 83 c4 08 ff 05 f3 4c 8e 0c 48 83 c4 10 5b 41 5c
RSP: 0018:ffffc90000a57990 EFLAGS: 00010246
RAX: 1ffffffff181f08c RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffffff8c6de740 RSI: ffffffff8c6de340 RDI: ffffffff91859a20
RBP: ffffffff8c6de740 R08: ffffffff9bda1f68 R09: ffffffff8c0f97c0
R10: dffffc0000000000 R11: ffffffff81b3f760 R12: 0000000000000000
R13: ffffffff91859a20 R14: ffffffff9bda1f68 R15: ffffffff8c0f8460
FS: 0000000000000000(0000) GS:ffff888123bbf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f57a01f0158 CR3: 000000003775d000 CR4: 0000000000350ef0
Call Trace:
<TASK>
__debug_object_init+0x230/0x3c0 lib/debugobjects.c:818
debug_timer_init kernel/time/timer.c:788 [inline]
debug_init kernel/time/timer.c:836 [inline]
timer_init_key+0x41/0x2c0 kernel/time/timer.c:880
do_work+0x1d5/0x2f0 drivers/greybus/svc_watchdog.c:91
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
----------------
Code disassembly (best guess):
0: f8 clc
1: 48 c1 e8 03 shr $0x3,%rax
5: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
9: 74 08 je 0x13
b: 4c 89 ff mov %r15,%rdi
e: e8 4d 99 4c fd call 0xfd4c9960
13: 4d 8b 0f mov (%r15),%r9
16: 4c 89 ef mov %r13,%rdi
19: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
1e: 48 89 ea mov %rbp,%rdx
21: 44 89 e1 mov %r12d,%ecx
24: 4d 89 f0 mov %r14,%r8
27: ff 34 24 push (%rsp)
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 83 c4 08 add $0x8,%rsp
33: ff 05 f3 4c 8e 0c incl 0xc8e4cf3(%rip) # 0xc8e4d2c
39: 48 83 c4 10 add $0x10,%rsp
3d: 5b pop %rbx
3e: 41 5c pop %r12
* Struck through repros no longer work on HEAD.