WARNING: ODEBUG bug in gb_operation_sync_timeout

Status: upstream: reported C repro on 2026/10/16 19:32
Subsystems: greybus
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+a2e50fb40695811c2dab@syzkaller.appspotmail.com
First crash: 9d15h, last: 1d03h
Cause bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (3)
ID Workflow Result Correct Bug Created Started Finished Revision
7036f9e9 repro-c Reproduced: ✅ ❓ WARNING: ODEBUG bug in gb_operation_sync_timeout 2026/10/13 09:43 2026/10/13 09:43 2026/10/13 11:30 745a967f
d460caa6 repro-c 💥 WARNING: ODEBUG bug in gb_operation_sync_timeout 2026/10/11 04:02 2026/10/11 04:02 2026/10/11 06:18 4f92358f
ea6863f4 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING: ODEBUG bug in gb_operation_sync_timeout 2026/10/10 00:00 2026/10/10 00:00 2026/10/10 00:36 549ef7e3
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] greybus: operation: arm the timeout timer before sending the request 1 (1) 2026/10/17 17:17
[syzbot] [greybus?] WARNING: ODEBUG bug in gb_operation_sync_timeout 0 (2) 2026/10/16 20:38
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING: ODEBUG bug in gb_operation_sync_timeout -1 syz, C 6 7h21m 20h06m 0/3 upstream: reported C repro on 2026/10/17 05:47
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/10/13 11:31 15m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 24a19b953e2a3d0ea5a8c4951a0ab8f32720c907 error job log

Sample crash report:
greybus greybus1: 0/0:0: synchronous operation id 0x0003 of type 0x10 failed: -71
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff8880125ba878 object type: timer_list hint: gb_operation_timeout+0x0/0xf0 drivers/greybus/operation.c:1265
WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#0: kworker/u8:6/164
Modules linked in:
CPU: 0 UID: 0 PID: 164 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: greybus1:svc gb_svc_process_deferred_request
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 7d b5 58 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 a3 61 d7 0b 48 83 c4 10 5b 41 5c
RSP: 0018:ffffc900042377e0 EFLAGS: 00010246
RAX: 1ffffffff16df3c0 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffffff8bcc7540 RSI: ffffffff8bcc6fc0 RDI: ffffffff90bccee0
RBP: ffffffff8bcc7540 R08: ffff8880125ba878 R09: ffffffff8b6fb180
R10: dffffc0000000000 R11: ffffffff81b2b680 R12: 0000000000000000
R13: ffffffff90bccee0 R14: ffff8880125ba878 R15: ffffffff8b6f9e00
FS:  0000000000000000(0000) GS:ffff8881249bb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fde90e52b8 CR3: 0000000046714000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:1171 [inline]
 debug_check_no_obj_freed+0x2e3/0x450 lib/debugobjects.c:1201
 slab_free_hook mm/slub.c:2679 [inline]
 slab_free mm/slub.c:6509 [inline]
 kmem_cache_free+0xfd/0x6d0 mm/slub.c:6636
 gb_operation_sync_timeout+0x1c7/0x270 drivers/greybus/operation.c:1172
 gb_operation_sync include/linux/greybus/operation.h:203 [inline]
 gb_svc_intf_set_power_mode drivers/greybus/svc.c:584 [inline]
 gb_svc_process_hello_deferred drivers/greybus/svc.c:936 [inline]
 gb_svc_process_deferred_request+0x5f3/0x1150 drivers/greybus/svc.c:1102
 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/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
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 7d b5 58 fd       	call   0xfd58b590
  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 a3 61 d7 0b    	incl   0xbd761a3(%rip)        # 0xbd761dc
  39:	48 83 c4 10          	add    $0x10,%rsp
  3d:	5b                   	pop    %rbx
  3e:	41 5c                	pop    %r12

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/16 22:43 upstream 2f2f7eeef8b0 b1757810 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 21:31 upstream 2f2f7eeef8b0 b1757810 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 20:38 upstream 2f2f7eeef8b0 b1757810 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 21:14 linux-next 2efb7a11f1aa b1757810 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 20:37 upstream 2f2f7eeef8b0 b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 20:37 upstream 2f2f7eeef8b0 b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 20:35 upstream 2f2f7eeef8b0 b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 20:32 upstream 2f2f7eeef8b0 b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 19:14 upstream 2f2f7eeef8b0 b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 19:14 upstream 2f2f7eeef8b0 b1757810 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 19:13 upstream 2f2f7eeef8b0 b1757810 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/08 09:55 upstream 7b63ef2d55f2 4f6a9fcf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING: ODEBUG bug in gb_operation_sync_timeout
2026/10/16 19:31 linux-next 2efb7a11f1aa b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce WARNING: ODEBUG bug in gb_operation_sync_timeout
* Struck through repros no longer work on HEAD.