general protection fault in l2cap_chan

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.19	general protection fault in l2cap_chan_timeout (2)	C		error	2	1223d	1315d	0/1	upstream: reported C repro on 2021/06/23 21:07
upstream	general protection fault in l2cap_chan_timeout (2) bluetooth				1	1343d	1338d	0/28	auto-closed as invalid on 2021/09/23 19:42
upstream	general protection fault in l2cap_chan_timeout bluetooth				1	1524d	1520d	0/28	auto-closed as invalid on 2021/03/25 23:40
upstream	general protection fault in l2cap_chan_timeout (3) bluetooth	C	inconclusive	inconclusive	9	50d	1083d	0/28	upstream: reported C repro on 2022/02/10 18:27
linux-4.14	general protection fault in l2cap_chan_timeout				1	1640d	1640d	0/1	auto-closed as invalid on 2020/11/29 23:43
linux-4.14	general protection fault in l2cap_chan_timeout (2)	C			3	709d	1074d	0/1	upstream: reported C repro on 2022/02/18 23:43

kasan: CONFIG_KASAN_INLINE enabled NOHZ: local_softirq_pending 08 kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 7634 Comm: kworker/1:3 Not tainted 4.19.141-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout RIP: 0010:__lock_acquire+0x1eb/0x3ff0 kernel/locking/lockdep.c:3294 Code: 2b 29 00 00 48 81 c4 98 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 b3 2a 00 00 49 81 3e 60 15 d4 8a 0f 84 65 ff ff RSP: 0018:ffff888050607958 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000053 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000001 R11: 000000000013a192 R12: 0000000000000000 R13: ffff8880505f2100 R14: 0000000000000298 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558e271a7230 CR3: 00000000a1048000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xd7/0x1260 kernel/locking/mutex.c:1072 l2cap_chan_timeout+0x51/0x210 net/bluetooth/l2cap_core.c:416 process_one_work+0x864/0x1570 kernel/workqueue.c:2155 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Modules linked in: ---[ end trace 201776b7a9b374eb ]--- RIP: 0010:__lock_acquire+0x1eb/0x3ff0 kernel/locking/lockdep.c:3294 Code: 2b 29 00 00 48 81 c4 98 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 b3 2a 00 00 49 81 3e 60 15 d4 8a 0f 84 65 ff ff RSP: 0018:ffff888050607958 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000053 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000001 R11: 000000000013a192 R12: 0000000000000000 R13: ffff8880505f2100 R14: 0000000000000298 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558e271a7230 CR3: 00000000a1048000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400