BUG: unable to handle kernel NULL pointer dereference in l2cap_chan


Created	Duration	User	Repo	Result
2021/10/31 12:05	13m	bisect fix	linux-4.19.y	error job log
2021/09/23 13:06	36m	bisect fix	linux-4.19.y	OK (0) job log log
2021/08/24 12:31	35m	bisect fix	linux-4.19.y	OK (0) job log log
2021/07/25 09:57	32m	bisect fix	linux-4.19.y	OK (0) job log log
2021/06/25 09:27	29m	bisect fix	linux-4.19.y	OK (0) job log log
2021/05/26 08:47	40m	bisect fix	linux-4.19.y	OK (0) job log log
2021/04/26 08:08	38m	bisect fix	linux-4.19.y	OK (0) job log log
2021/03/27 04:57	25m	bisect fix	linux-4.19.y	OK (0) job log log
2021/02/24 18:36	26m	bisect fix	linux-4.19.y	OK (0) job log log
2021/02/05 06:44	0m	bisect fix	linux-4.19.y	error job log
2021/01/06 06:15	28m	bisect fix	linux-4.19.y	OK (0) job log log
2020/12/06 22:49	29m	bisect fix	linux-4.19.y	OK (0) job log log
2020/11/06 22:10	29m	bisect fix	linux-4.19.y	OK (0) job log log
2020/10/07 21:00	31m	bisect fix	linux-4.19.y	OK (0) job log log
2020/09/07 20:05	34m	bisect fix	linux-4.19.y	OK (0) job log log

BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 PGD 9a7e9067 P4D 9a7e9067 PUD 91aea067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN CPU: 1 PID: 6464 Comm: kworker/1:0 Not tainted 4.19.138-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events l2cap_chan_timeout RIP: 0010:refcount_dec_and_test arch/x86/include/asm/refcount.h:76 [inline] RIP: 0010:kref_put include/linux/kref.h:69 [inline] RIP: 0010:l2cap_chan_put+0x10/0x1c0 net/bluetooth/l2cap_core.c:493 Code: ff e8 94 80 1e fb e9 fe fe ff ff 48 89 df e8 b7 7d 1e fb e9 ac fe ff ff 66 90 41 56 41 55 41 54 55 48 89 fd 53 e8 f0 5e e8 fa <f0> ff 4d 18 0f 88 11 37 b9 00 0f 94 c3 31 ff 89 de e8 0a 60 e8 fa RSP: 0018:ffff888089c6fcb0 EFLAGS: 00010293 RAX: ffff8880923943c0 RBX: 0000000000000001 RCX: ffffffff8684aa52 RDX: 0000000000000000 RSI: ffffffff868150d0 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88808e438dc0 R13: ffff888096049478 R14: ffff88808e439228 R15: ffff8880ae730200 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000018 CR3: 000000008bc8f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: l2cap_sock_kill.part.0+0x34/0x80 net/bluetooth/l2cap_sock.c:1053 l2cap_sock_kill net/bluetooth/l2cap_sock.c:1312 [inline] l2cap_sock_close_cb+0xa7/0xd0 net/bluetooth/l2cap_sock.c:1311 l2cap_chan_timeout+0x1bb/0x210 net/bluetooth/l2cap_core.c:431 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: CR2: 0000000000000018 ---[ end trace be7e3718029e52dc ]--- RIP: 0010:refcount_dec_and_test arch/x86/include/asm/refcount.h:76 [inline] RIP: 0010:kref_put include/linux/kref.h:69 [inline] RIP: 0010:l2cap_chan_put+0x10/0x1c0 net/bluetooth/l2cap_core.c:493 Code: ff e8 94 80 1e fb e9 fe fe ff ff 48 89 df e8 b7 7d 1e fb e9 ac fe ff ff 66 90 41 56 41 55 41 54 55 48 89 fd 53 e8 f0 5e e8 fa <f0> ff 4d 18 0f 88 11 37 b9 00 0f 94 c3 31 ff 89 de e8 0a 60 e8 fa RSP: 0018:ffff888089c6fcb0 EFLAGS: 00010293 RAX: ffff8880923943c0 RBX: 0000000000000001 RCX: ffffffff8684aa52 RDX: 0000000000000000 RSI: ffffffff868150d0 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88808e438dc0 R13: ffff888096049478 R14: ffff88808e439228 R15: ffff8880ae730200 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000018 CR3: 000000008bc8f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400