syzbot
WARNING: ODEBUG bug in netdev_run_todo (3)
Status: auto-obsoleted due to no activity on 2026/07/12 02:40
Subsystems:
net
Labels:
prio:high
[Documentation on labels]
First crash: 126d, last: 126d
Sample crash report:
bond4 (unregistering): Released all slaves
bond5 (unregistering): Released all slaves
bond6 (unregistering): Released all slaves
bond7 (unregistering): Released all slaves
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff88802480ce80 object type: timer_list hint: vxlan_cleanup+0x0/0x530 drivers/net/vxlan/vxlan_core.c:4671
WARNING: lib/debugobjects.c:632 at debug_print_object lib/debugobjects.c:629 [inline], CPU#1: kworker/u8:6/11014
WARNING: lib/debugobjects.c:632 at __debug_check_no_obj_freed lib/debugobjects.c:1116 [inline], CPU#1: kworker/u8:6/11014
WARNING: lib/debugobjects.c:632 at debug_check_no_obj_freed+0x405/0x550 lib/debugobjects.c:1146, CPU#1: kworker/u8:6/11014
Modules linked in:
CPU: 1 UID: 0 PID: 11014 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: netns cleanup_net
RIP: 0010:debug_print_object lib/debugobjects.c:629 [inline]
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
RIP: 0010:debug_check_no_obj_freed+0x44a/0x550 lib/debugobjects.c:1146
Code: 89 44 24 20 e8 07 dc 76 fd 48 8b 44 24 20 4c 8b 4d 00 4c 89 ef 48 c7 c6 c0 c7 27 8c 48 c7 c2 40 cd 27 8c 8b 0c 24 4d 89 f8 50 <67> 48 0f b9 3a 48 83 c4 08 4c 8b 6c 24 18 48 b9 00 00 00 00 00 fc
RSP: 0018:ffffc90004bb7680 EFLAGS: 00010246
RAX: ffffffff86855f30 RBX: ffffffff9a52aeb0 RCX: 0000000000000000
RDX: ffffffff8c27cd40 RSI: ffffffff8c27c7c0 RDI: ffffffff901c0db0
RBP: ffffffff8bcf3dc0 R08: ffff88802480ce80 R09: ffffffff8bcf50e0
R10: dffffc0000000000 R11: ffffffff81b1e960 R12: ffff88802480e000
R13: ffffffff901c0db0 R14: ffff88802480c000 R15: ffff88802480ce80
FS: 0000000000000000(0000) GS:ffff888125561000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2dd05ff8 CR3: 000000002b63c000 CR4: 00000000003526f0
Call Trace:
<TASK>
slab_free_hook mm/slub.c:2616 [inline]
slab_free mm/slub.c:6165 [inline]
kfree+0x13a/0x630 mm/slub.c:6483
device_release+0x9e/0x1d0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x560 lib/kobject.c:737
netdev_run_todo+0xc75/0xde0 net/core/dev.c:11749
ops_exit_rtnl_list net/core/net_namespace.c:189 [inline]
ops_undo_list+0x3d8/0x940 net/core/net_namespace.c:248
cleanup_net+0x56b/0x800 net/core/net_namespace.c:704
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 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: 89 44 24 20 mov %eax,0x20(%rsp)
4: e8 07 dc 76 fd call 0xfd76dc10
9: 48 8b 44 24 20 mov 0x20(%rsp),%rax
e: 4c 8b 4d 00 mov 0x0(%rbp),%r9
12: 4c 89 ef mov %r13,%rdi
15: 48 c7 c6 c0 c7 27 8c mov $0xffffffff8c27c7c0,%rsi
1c: 48 c7 c2 40 cd 27 8c mov $0xffffffff8c27cd40,%rdx
23: 8b 0c 24 mov (%rsp),%ecx
26: 4d 89 f8 mov %r15,%r8
29: 50 push %rax
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: 48 83 c4 08 add $0x8,%rsp
33: 4c 8b 6c 24 18 mov 0x18(%rsp),%r13
38: 48 rex.W
39: b9 00 00 00 00 mov $0x0,%ecx
3e: 00 fc add %bh,%ah
* Struck through repros no longer work on HEAD.