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
▶ ▼ ✨ AI Jobs (3)
ID Workflow Result Correct Bug Created Started Finished Revision
8d2411f1 repro-c 💥 WARNING: ODEBUG bug in do_work 2026/10/16 06:01 2026/10/16 06:02 2026/10/16 06:59 3f2522c6
711121f5 repro-c 💥 WARNING: ODEBUG bug in do_work 2026/10/14 05:59 2026/10/14 05:59 2026/10/14 09:33 7321cd29
2f6bb4e0 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ✅ ❓ WARNING: ODEBUG bug in do_work 2026/10/13 08:26 2026/10/13 08:26 2026/10/13 09:14 745a967f

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

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/16 20:28 upstream 2f2f7eeef8b0 b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING: ODEBUG bug in do_work
2026/10/11 17:12 upstream a5ebb76233b7 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING: ODEBUG bug in do_work
* Struck through repros no longer work on HEAD.