general protection fault in l2cap_chan

general protection fault in l2cap_chan_timeout
Status: upstream: reported on 2020/11/30 06:30
Reported-by: syzbot+e7edf1d784c283324076@syzkaller.appspotmail.com
First crash: 60d, last: 60d

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	general protection fault in l2cap_chan_timeout				1	176d	176d	0/1	auto-closed as invalid on 2020/11/29 23:43
linux-4.19	general protection fault in l2cap_chan_timeout				1	154d	154d	0/1	auto-closed as invalid on 2020/12/21 18:33

Sample crash report:

general protection fault, probably for non-canonical address 0xdffffc000000005a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000002d0-0x00000000000002d7]
CPU: 1 PID: 16756 Comm: kworker/1:8 Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events l2cap_chan_timeout
RIP: 0010:__mutex_lock_common+0x9b/0x2f20 kernel/locking/mutex.c:938
Code: 8a bc 24 28 01 00 00 83 3d 01 69 0f 06 00 75 34 48 8b 44 24 08 48 8d 78 60 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 ba 7f 77 f8 48 8b 44 24 08 48 39 40 60 0f 85
RSP: 0018:ffffc9000245fb78 EFLAGS: 00010206
RAX: 000000000000005a RBX: ffff8880708d8110 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000002d0
RBP: 0000000000000000 R08: ffffffff8876a063 R09: 0000000000000000
R10: fffffbfff1a1c3ee R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b9d33c00
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffde459fd3c CR3: 00000000186a5000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __mutex_lock kernel/locking/mutex.c:1103 [inline]
 mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1118
 l2cap_chan_timeout+0x53/0x280 net/bluetooth/l2cap_core.c:422
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2272
 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2418
 kthread+0x39a/0x3c0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Modules linked in:
---[ end trace c01f537d4b85904a ]---
RIP: 0010:__mutex_lock_common+0x9b/0x2f20 kernel/locking/mutex.c:938
Code: 8a bc 24 28 01 00 00 83 3d 01 69 0f 06 00 75 34 48 8b 44 24 08 48 8d 78 60 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 05 e8 ba 7f 77 f8 48 8b 44 24 08 48 39 40 60 0f 85
RSP: 0018:ffffc9000245fb78 EFLAGS: 00010206
RAX: 000000000000005a RBX: ffff8880708d8110 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000002d0
RBP: 0000000000000000 R08: ffffffff8876a063 R09: 0000000000000000
R10: fffffbfff1a1c3ee R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b9d33c00
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbcfa32740 CR3: 000000006d47f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-kasan-gce-smack-root	2020/11/25 23:39	upstream	fa02fcd9	2f1cec62	.config	log	report			info	davem@davemloft.net, johan.hedberg@gmail.com, kuba@kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, marcel@holtmann.org, netdev@vger.kernel.org