syzbot

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workqueue: cannot queue hci_conn_timeout on wq hci4
WARNING: CPU: 0 PID: 6664 at kernel/workqueue.c:2258 __queue_work+0xe10/0x1210 kernel/workqueue.c:2256
Modules linked in:
CPU: 0 UID: 0 PID: 6664 Comm: kworker/0:6 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Workqueue: events l2cap_chan_timeout
pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __queue_work+0xe10/0x1210 kernel/workqueue.c:2256
lr : __queue_work+0xe10/0x1210 kernel/workqueue.c:2256
sp : ffff80009fa577e0
x29: ffff80009fa57830 x28: 1fffe00018da4400 x27: ffff0000c669bac0
x26: 0000000000000008 x25: dfff800000000000 x24: ffff0000c9fdd000
x23: ffff0000c9fdd1c0 x22: 0000000004208060 x21: 1fffe000193fba38
x20: ffff800092bf7000 x19: ffff0000d9dec960 x18: 00000000ffffffff
x17: ffff800093303000 x16: ffff800082deb6c0 x15: 0000000000000001
x14: 1ffff00012233aa4 x13: 0000000000000000 x12: 0000000000000000
x11: ffff700012233aa5 x10: 0000000000ff0100 x9 : a545ba0b58ce1800
x8 : a545ba0b58ce1800 x7 : ffff800080564a40 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000000 x3 : ffff8000807d5f04
x2 : 0000000000000002 x1 : 0000000100000000 x0 : 0000000000000000
Call trace:
 __queue_work+0xe10/0x1210 kernel/workqueue.c:2256 (P)
 __queue_delayed_work+0xfc/0x2c8 kernel/workqueue.c:2509
 queue_delayed_work_on+0xe4/0x194 kernel/workqueue.c:2561
 queue_delayed_work include/linux/workqueue.h:684 [inline]
 hci_conn_drop+0x174/0x280 include/net/bluetooth/hci_core.h:1699
 l2cap_chan_del+0x228/0x470 net/bluetooth/l2cap_core.c:671
 l2cap_chan_close+0x424/0x684 net/bluetooth/l2cap_core.c:-1
 l2cap_chan_timeout+0x120/0x280 net/bluetooth/l2cap_core.c:431
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3263
 process_scheduled_works kernel/workqueue.c:3346 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3427
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
irq event stamp: 102462
hardirqs last  enabled at (102461): [<ffff800080427658>] __cancel_work+0x158/0x218 kernel/workqueue.c:4373
hardirqs last disabled at (102462): [<ffff800080422c88>] queue_delayed_work_on+0x54/0x194 kernel/workqueue.c:2557
softirqs last  enabled at (102456): [<ffff8000890311a8>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (102456): [<ffff8000890311a8>] release_sock+0x14c/0x1ac net/core/sock.c:3744
softirqs last disabled at (102454): [<ffff800089031090>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (102454): [<ffff800089031090>] release_sock+0x34/0x1ac net/core/sock.c:3733
---[ end trace 0000000000000000 ]---