ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 1 UID: 0 PID: 5754 Comm: kworker/u34:4 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: hci4 hci_conn_timeout
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 vpanic+0x553/0x970 kernel/panic.c:651
 panic+0xd1/0xe0 kernel/panic.c:788
 check_panic_on_warn kernel/panic.c:525 [inline]
 check_panic_on_warn.cold+0x19/0x34 kernel/panic.c:520
 __warn.cold+0x191/0x318 kernel/panic.c:1104
 __report_bug+0x30f/0x440 lib/bug.c:254
 report_bug+0xb3/0x220 lib/bug.c:286
 handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436
 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:593
RIP: 0010:hci_conn_timeout+0x16a/0x230 net/bluetooth/hci_conn.c:649
Code: 44 0f b6 2d 8b 95 7a 06 31 ff 41 83 e5 40 44 89 ee e8 ea 33 45 f7 45 84 ed 0f 84 02 ff ff ff e9 49 9b ab f6 e8 c7 39 45 f7 90 <0f> 0b 90 e8 be 39 45 f7 48 8d bb ed f5 ff ff 48 b8 00 00 00 00 00
RSP: 0000:ffffc900047f7bf8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88805ce2ca50 RCX: 0000000000000000
RDX: ffff88802288a580 RSI: ffffffff8ac66c29 RDI: ffff88802288a580
RBP: 00000000ffffffff R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000001 R12: ffff88805ce2c000
R13: 0000000000000000 R14: ffffffff8d5748c0 R15: ffff88802acbf000
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..