------------[ cut here ]------------ workqueue: cannot queue hci_tx_work on wq hci4 WARNING: CPU: 0 PID: 19159 at kernel/workqueue.c:2256 __queue_work+0xd38/0xfb0 kernel/workqueue.c:2254 Modules linked in: CPU: 0 UID: 0 PID: 19159 Comm: syz.3.3774 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 f3 10 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 2a 9e 35 00 90 0f 0b 90 e9 dd fc ff RSP: 0018:ffffc90002f874b0 EFLAGS: 00010046 RAX: 23d4b1a0abd5be00 RBX: 0000000000000000 RCX: ffff888025ea0000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 RBP: 1ffff11009aa3238 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfa22c R12: dffffc0000000000 R13: ffff888059c34b68 R14: ffff888025ea0000 R15: ffff88804d519178 FS: 00007fb04893f6c0(0000) GS:ffff888125c15000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000006038 CR3: 00000000272aa000 CR4: 00000000003526f0 Call Trace: queue_work_on+0x181/0x270 kernel/workqueue.c:2390 l2cap_chan_send+0x1110/0x2790 net/bluetooth/l2cap_core.c:-1 l2cap_sock_sendmsg+0x32e/0x4a0 net/bluetooth/l2cap_sock.c:1139 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x52d/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmmsg+0x227/0x430 net/socket.c:2757 __do_sys_sendmmsg net/socket.c:2784 [inline] __se_sys_sendmmsg net/socket.c:2781 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2781 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: 0033:0x7fb047b8eba9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007fb04893f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fb047dd5fa0 RCX: 00007fb047b8eba9 RDX: 00000000ffffff80 RSI: 0000200000004100 RDI: 0000000000000004 RBP: 00007fb047c11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb047dd6038 R14: 00007fb047dd5fa0 R15: 00007ffcb17543b8