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
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
1f828346 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING: ODEBUG bug in netdev_run_todo (3) 2026/05/24 04:24 2026/05/24 04:24 2026/05/24 05:32 c69befb3

			
		
Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING: ODEBUG bug in netdev_run_todo -1 syz 64 1142d 1232d 0/3 auto-obsoleted due to no activity on 2023/08/23 09:02
linux-4.19 WARNING: ODEBUG bug in netdev_run_todo -1 syz 308 1243d 2231d 0/1 upstream: reported syz repro on 2020/06/16 11:21
upstream WARNING: ODEBUG bug in netdev_run_todo (2) net -1 1 259d 259d 0/29 closed as invalid on 2026/01/09 16:54
upstream WARNING: ODEBUG bug in netdev_run_todo batman -1 C error error 5467 1127d 2181d 25/29 fixed on 2024/02/03 08:56
linux-6.1 WARNING: ODEBUG bug in netdev_run_todo origin:lts-only -1 syz unreliable 37 231d 1236d 0/3 upstream: reported syz repro on 2023/03/08 11:05
linux-4.14 WARNING: ODEBUG bug in netdev_run_todo -1 C error 350 1536d 2239d 0/1 upstream: reported C repro on 2020/06/08 15:34

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

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/03/22 00:51 net-next fb78a629b4f0 5b92003d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING: ODEBUG bug in netdev_run_todo
* Struck through repros no longer work on HEAD.