------------[ cut here ]------------
workqueue: cannot queue hci_cmd_timeout on wq hci0
WARNING: CPU: 1 PID: 6077 at kernel/workqueue.c:2256 __queue_work+0xd38/0xfb0 kernel/workqueue.c:2254
Modules linked in:
CPU: 1 UID: 0 PID: 6077 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__queue_work+0xd38/0xfb0 kernel/workqueue.c:2254
Code: 42 80 3c 20 00 74 08 4c 89 ef e8 53 0f 99 00 49 8b 75 00 49 81 c7 78 01 00 00 48 c7 c7 20 e1 89 8b 4c 89 fa e8 99 39 f9 ff 90 <0f> 0b 90 90 e9 1a f5 ff ff e8 8a 9c 35 00 90 0f 0b 90 e9 dd fc ff
RSP: 0018:ffffc90000a08b10 EFLAGS: 00010046
RAX: 3f274d39a5948200 RBX: 0000000000000100 RCX: ffff88802f685a00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 1ffff11029bd0c38 R08: ffff8880b8724253 R09: 1ffff110170e484a
R10: dffffc0000000000 R11: ffffed10170e484b R12: dffffc0000000000
R13: ffff8880315f0988 R14: 0000000000000008 R15: ffff88814de86178
FS:  000055558ca13500(0000) GS:ffff888125d15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff57be01000 CR3: 000000006d4e4000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1793 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x646/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x286/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 2b 78 4a f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> e3 1e 13 f6 65 8b 05 6c c1 23 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc9000b1d7240 EFLAGS: 00000206
RAX: 3f274d39a5948200 RBX: 0000000000000216 RCX: 3f274d39a5948200
RDX: 0000000000000006 RSI: ffffffff8d9b9e62 RDI: 0000000000000001
RBP: ffffc9000b1d72d0 R08: ffffffff8fa3a537 R09: 1ffffffff1f474a6
R10: dffffc0000000000 R11: fffffbfff1f474a7 R12: dffffc0000000000
R13: 0000000000000003 R14: ffff88801b699480 R15: 1ffff9200163ae48
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 get_partial_node+0x35f/0x390 mm/slub.c:2938
 get_partial mm/slub.c:3018 [inline]
 ___slab_alloc+0xb3f/0x1420 mm/slub.c:3876
 __slab_alloc mm/slub.c:3992 [inline]
 __slab_alloc_node mm/slub.c:4067 [inline]
 slab_alloc_node mm/slub.c:4228 [inline]
 kmem_cache_alloc_lru_noprof+0x288/0x3d0 mm/slub.c:4259
 __d_alloc+0x36/0x7a0 fs/dcache.c:1690
 d_alloc_parallel+0xe5/0x15e0 fs/dcache.c:2549
 __lookup_slow+0x116/0x3d0 fs/namei.c:1793
 simple_start_creating+0xfd/0x1e0 fs/libfs.c:2303
 start_creating+0x10f/0x180 fs/debugfs/inode.c:396
 __debugfs_create_file+0x79/0x4f0 fs/debugfs/inode.c:431
 debugfs_create_file_full+0x3f/0x60 fs/debugfs/inode.c:468
 ref_tracker_dir_debugfs+0x14e/0x270 lib/ref_tracker.c:441
 ref_tracker_dir_init include/linux/ref_tracker.h:70 [inline]
 alloc_netdev_mqs+0x26f/0x11b0 net/core/dev.c:11819
 loopback_net_init+0x3a/0x150 drivers/net/loopback.c:213
 ops_init+0x35c/0x5c0 net/core/net_namespace.c:136
 setup_net+0x10c/0x320 net/core/net_namespace.c:438
 copy_net_ns+0x31b/0x4d0 net/core/net_namespace.c:570
 create_new_namespaces+0x3f3/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:218
 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3127
 __do_sys_unshare kernel/fork.c:3198 [inline]
 __se_sys_unshare kernel/fork.c:3196 [inline]
 __x64_sys_unshare+0x38/0x50 kernel/fork.c:3196
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd7b11903a7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd761d2578 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fd7b13d5f40 RCX: 00007fd7b11903a7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007fd7b13d67b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	74 05                	je     0x7
   2:	e8 2b 78 4a f6       	call   0xf64a7832
   7:	48 c7 44 24 20 00 00 	movq   $0x0,0x20(%rsp)
   e:	00 00
  10:	9c                   	pushf
  11:	8f 44 24 20          	pop    0x20(%rsp)
  15:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
  1a:	75 4f                	jne    0x6b
  1c:	f7 c3 00 02 00 00    	test   $0x200,%ebx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 e3 1e 13 f6       	call   0xf6131f12 <-- trapping instruction
  2f:	65 8b 05 6c c1 23 07 	mov    %gs:0x723c16c(%rip),%eax        # 0x723c1a2
  36:	85 c0                	test   %eax,%eax
  38:	74 40                	je     0x7a
  3a:	48                   	rex.W
  3b:	c7                   	.byte 0xc7
  3c:	04 24                	add    $0x24,%al
  3e:	0e                   	(bad)
  3f:	36                   	ss