------------[ cut here ]------------
WARNING: CPU: 0 PID: 9 at kernel/workqueue.c:1441 __queue_work+0xe2d/0xfb0 kernel/workqueue.c:1441
Modules linked in:
CPU: 0 PID: 9 Comm: kworker/u4:0 Not tainted 6.1.136-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Workqueue: netns cleanup_net
RIP: 0010:__queue_work+0xe2d/0xfb0 kernel/workqueue.c:1441
Code: e9 9d fc ff ff 48 8b 0c 24 80 e1 07 80 c1 03 38 c1 0f 8c c7 fc ff ff 48 8b 3c 24 e8 7d 2a 7f 00 e9 b9 fc ff ff e8 73 b7 2d 00 <0f> 0b 48 83 c4 60 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 5d b7 2d 00
RSP: 0018:ffffc90000007ae8 EFLAGS: 00010046
RAX: ffffffff81530c2d RBX: 0000000000010000 RCX: ffff88813fe80000
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1bfd03e
R10: fffffbfff1bfd03e R11: 1ffffffff1bfd03d R12: ffff88802666e800
R13: ffff88802666e9c0 R14: 0000000000000008 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3278924ba8 CR3: 0000000075059000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1544 [inline]
 __run_timers+0x550/0x7c0 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 handle_softirqs+0x2a1/0x920 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:661
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lockdep_unregister_key+0x4c3/0x530 kernel/locking/lockdep.c:6370
Code: 81 86 90 48 c7 c6 80 7d 63 81 e8 88 93 07 00 e8 d3 a6 07 00 e9 86 fc ff ff e8 09 94 ab 08 41 f7 c4 00 02 00 00 74 d1 fb 84 db <75> d0 eb e1 0f 0b eb a1 0f 0b e9 11 ff ff ff 0f 0b e9 5e ff ff ff
RSP: 0018:ffffc900000e77a0 EFLAGS: 00000202
RAX: 3d44a60c03a5bc00 RBX: ffff88801bf89201 RCX: 3d44a60c03a5bc00
RDX: 0000000000000001 RSI: ffffffff8a6c0ae0 RDI: ffffffff8abf0da0
RBP: ffffc900000e7880 R08: dffffc0000000000 R09: fffffbfff211125a
R10: fffffbfff211125a R11: 1ffffffff2111259 R12: 0000000000000203
R13: ffff88801bf89299 R14: ffffffff908881a8 R15: 1ffff9200001cef8
 __qdisc_destroy+0x128/0x430 net/sched/sch_generic.c:1078
 qdisc_put net/sched/sch_generic.c:1104 [inline]
 dev_shutdown+0x34b/0x440 net/sched/sch_generic.c:1492
 unregister_netdevice_many+0xa32/0x1840 net/core/dev.c:10969
 vti6_exit_batch_net+0x3c6/0x410 net/ipv6/ip6_vti.c:1190
 ops_exit_list net/core/net_namespace.c:177 [inline]
 cleanup_net+0x77b/0xb80 net/core/net_namespace.c:640
 process_one_work+0x898/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	81 86 90 48 c7 c6 80 	addl   $0x81637d80,-0x3938b770(%rsi)
   7:	7d 63 81
   a:	e8 88 93 07 00       	call   0x79397
   f:	e8 d3 a6 07 00       	call   0x7a6e7
  14:	e9 86 fc ff ff       	jmp    0xfffffc9f
  19:	e8 09 94 ab 08       	call   0x8ab9427
  1e:	41 f7 c4 00 02 00 00 	test   $0x200,%r12d
  25:	74 d1                	je     0xfffffff8
  27:	fb                   	sti
  28:	84 db                	test   %bl,%bl
* 2a:	75 d0                	jne    0xfffffffc <-- trapping instruction
  2c:	eb e1                	jmp    0xf
  2e:	0f 0b                	ud2
  30:	eb a1                	jmp    0xffffffd3
  32:	0f 0b                	ud2
  34:	e9 11 ff ff ff       	jmp    0xffffff4a
  39:	0f 0b                	ud2
  3b:	e9 5e ff ff ff       	jmp    0xffffff9e