syzbot
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: 10d, last: 1d11h
▶
▼
Last patch testing requests (1)
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
* Struck through repros no longer work on HEAD.