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* [syzbot] [greybus?] WARNING: ODEBUG bug in gb_operation_sync_timeout
@ 2026-10-16 19:32 syzbot
  2026-10-16 20:38 ` syzbot
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2026-10-16 19:32 UTC (permalink / raw)
  To: elder, gregkh, greybus-dev, johan, linux-kernel, linux-media,
	linux-staging, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    2f2f7eeef8b0 Merge tag 'soc-fixes-7.3-3' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=157b1bd1580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c4b098695335c89f
dashboard link: https://syzkaller.appspot.com/bug?extid=a2e50fb40695811c2dab
compiler:       Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e46a243fa39c/disk-2f2f7eee.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/04a37a0099c0/vmlinux-2f2f7eee.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c2964fdca34d/bzImage-2f2f7eee.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a2e50fb40695811c2dab@syzkaller.appspotmail.com

greybus greybus1: 0/0:0: synchronous operation id 0x0002 of type 0x10 failed: -71
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888087f2c878 object type: timer_list hint: gb_operation_timeout+0x0/0x110 drivers/greybus/operation.c:1265
WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#1: kworker/u8:19/14610
Modules linked in:
CPU: 1 UID: 0 PID: 14610 Comm: kworker/u8:19 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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 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:ffffc9000767f7e0 EFLAGS: 00010246
RAX: 1ffffffff181f08c RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffffff8c6de740 RSI: ffffffff8c6de1c0 RDI: ffffffff91859a20
RBP: ffffffff8c6de740 R08: ffff888087f2c878 R09: ffffffff8c0f97c0
R10: dffffc0000000000 R11: ffffffff81b3f760 R12: 0000000000000000
R13: ffffffff91859a20 R14: ffff888087f2c878 R15: ffffffff8c0f8460
FS:  0000000000000000(0000) GS:ffff888123bbf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c25d909 CR3: 0000000071620000 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/0x650 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/0x480 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 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


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2026-10-16 19:32 [syzbot] [greybus?] WARNING: ODEBUG bug in gb_operation_sync_timeout syzbot
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