WARNING in hci_conn

WARNING in hci_conn_timeout
Status: upstream: reported C repro on 2020/08/01 18:55
Reported-by: syzbot+2446dd3cb07277388db6@syzkaller.appspotmail.com
First crash: 441d, last: 2d19h

Cause bisection: introduced by (bisect log) :
commit 3d30311c0e4d834c94e6a27d6242a942d6a76b85
Author: Varsha Rao <rvarsha016@gmail.com>
Date: Sun Oct 9 11:13:56 2016 +0000

staging: vt6655: Removes unnecessary blank lines.

Crash: WARNING in nf_unregister_net_hook (log)
Repro: C syz .config

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	WARNING in hci_conn_timeout	C		inconclusive	19	12d	443d	0/1	upstream: reported C repro on 2020/07/31 02:13
linux-4.19	WARNING in hci_conn_timeout	C			14	11d	441d	0/1	upstream: reported C repro on 2020/08/01 17:09

Sample crash report:

------------[ cut here ]------------
WARNING: CPU: 1 PID: 8448 at net/bluetooth/hci_conn.c:445 hci_conn_timeout+0x32b/0x470 net/bluetooth/hci_conn.c:445
Modules linked in:
CPU: 1 PID: 8448 Comm: kworker/u5:2 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_conn_timeout
RIP: 0010:hci_conn_timeout+0x32b/0x470 net/bluetooth/hci_conn.c:445
Code: 00 48 c1 e8 03 80 3c 08 00 0f 85 1b 01 00 00 48 8b 35 e1 fc 55 05 bf 08 00 00 00 e8 ff 2f 34 f9 e9 4c fe ff ff e8 c5 75 5e f9 <0f> 0b e9 61 fd ff ff 48 89 ef e8 46 27 a5 f9 e9 18 fd ff ff e8 1c
RSP: 0018:ffffc9000165fcf0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88801d974138 RCX: 0000000000000000
RDX: ffff888028b91c80 RSI: ffffffff8817aa4b RDI: 0000000000000003
RBP: 00000000ffffffff R08: 0000000000000000 R09: ffff88801d974013
R10: ffffffff8817a795 R11: 0000000000000000 R12: ffff88801d974000
R13: ffff88801d974148 R14: ffff888017e9f600 R15: ffff8880157d5000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001b28608 CR3: 000000001cf4f000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Fix bisection attempts:
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kasan-gce-selinux-root	2021/05/08 10:20	upstream	dd860052c99b	79fb24e2	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2021/04/08 09:57	upstream	454859c552da	79fb24e2	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2021/03/03 17:31	upstream	f69d02e37a85	79fb24e2	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2021/01/25 22:58	upstream	f8ad8187c3b5	79fb24e2	.config	log	report	syz	C

Crashes (41):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce	2021/09/02 10:22	upstream	835d31d319d9	7eb7e152	.config	log	report	syz	C		WARNING in hci_conn_timeout
ci-upstream-kasan-gce-selinux-root	2020/09/12 06:32	upstream	e8878ab82545	79fb24e2	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/09/11 04:54	upstream	7fe10096c150	409809d8	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/09/07 06:25	upstream	a8205e310011	abf9ba4f	.config	log	report	syz	C
ci-upstream-kasan-gce	2020/09/06 17:53	upstream	dd9fb9bb3340	abf9ba4f	.config	log	report	syz	C
ci-upstream-kasan-gce	2020/08/14 03:03	upstream	990f227371a4	54ce1ed6	.config	log	report	syz	C
ci-upstream-kasan-gce-smack-root	2020/08/01 16:24	upstream	7dc6fd0f3b84	d895b3be	.config	log	report	syz	C
ci-upstream-kasan-gce-386	2020/09/06 21:42	upstream	dd9fb9bb3340	abf9ba4f	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/09/24 21:57	linux-next	d1d2220c7f39	54289b08	.config	log	report	syz	C
ci-upstream-linux-next-kasan-gce-root	2020/08/05 18:50	linux-next	01830e6c042e	b7129355	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2021/10/14 10:04	upstream	348949d9a444	5462d470	.config	log	report			info	WARNING in hci_conn_timeout
ci-upstream-kasan-gce-smack-root	2021/09/27 01:10	upstream	996148ee05d0	78494d16	.config	log	report			info	WARNING in hci_conn_timeout
ci-upstream-kasan-gce	2021/08/29 21:51	upstream	3f5ad13cb012	be2c130d	.config	log	report			info	WARNING in hci_conn_timeout
ci-upstream-kasan-gce-root	2021/08/16 13:02	upstream	7c60610d4767	33c26cb7	.config	log	report			info	WARNING in hci_conn_timeout
ci-upstream-kasan-gce-selinux-root	2021/08/02 21:17	upstream	c500bee1c5b2	6c236867	.config	log	report			info	WARNING in hci_conn_timeout
ci-upstream-kasan-gce-root	2021/07/14 05:46	upstream	40226a3d96ef	484502bd	.config	log	report			info	WARNING in hci_conn_timeout
ci-upstream-kasan-gce-root	2021/07/11 12:15	upstream	3dbdb38e2869	8f5a7b8c	.config	log	report			info	WARNING in hci_conn_timeout
ci-upstream-kasan-gce-smack-root	2021/06/11 07:25	upstream	f09eacca59d2	1ba81399	.config	log	report			info	WARNING in hci_conn_timeout
ci-qemu2-arm64-mte	2021/03/08 16:56	upstream	144c79ef3353	09fbf400	.config	log	report			info	WARNING in hci_conn_timeout
ci-upstream-linux-next-kasan-gce-root	2021/06/02 08:55	linux-next	a1f92694393a	032639db	.config	log	report			info	WARNING in hci_conn_timeout
ci-upstream-kasan-gce	2020/12/26 22:20	upstream	40f78232f973	821e0b09	.config	log	report			info
ci-upstream-kasan-gce	2020/12/15 18:56	upstream	148842c98a24	97183ed7	.config	log	report			info
ci-upstream-kasan-gce-smack-root	2020/11/28 08:15	upstream	99c710c46dfc	486f93ef	.config	log	report			info
ci-upstream-kasan-gce	2020/11/06 17:07	upstream	521b619acdc8	64069d48	.config	log	report			info
ci-upstream-kasan-gce	2020/10/10 10:07	upstream	6f2f486d57c4	93817d89	.config	log	report			info
ci-upstream-kasan-gce-root	2020/09/29 10:01	upstream	fb0155a09b02	1b88c6d5	.config	log	report			info
ci-upstream-kasan-gce-root	2020/09/24 13:49	upstream	c9c9e6a49f89	54289b08	.config	log	report			info
ci-upstream-kasan-gce-root	2020/09/24 12:03	upstream	c9c9e6a49f89	54289b08	.config	log	report			info
ci-upstream-kasan-gce	2020/08/31 14:24	upstream	dcc5c6f013d8	d5a3ae1f	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/08/21 18:00	upstream	da2968ff879b	6436ce4b	.config	log	report
ci-upstream-kasan-gce-root	2020/08/13 05:29	upstream	fb893de323e2	bc15f7db	.config	log	report
ci-upstream-kasan-gce-selinux-root	2020/08/08 05:35	upstream	5631c5e0eb90	ff51e522	.config	log	report
ci-upstream-kasan-gce-root	2020/08/08 05:28	upstream	5631c5e0eb90	ff51e522	.config	log	report
ci-upstream-kasan-gce-root	2020/08/06 06:14	upstream	fffe3ae0ee84	0487ea6f	.config	log	report
ci-upstream-kasan-gce-selinux-root	2020/08/02 10:47	upstream	ac3a0c847296	63a73341	.config	log	report
ci-upstream-kasan-gce-selinux-root	2020/08/02 10:42	upstream	ac3a0c847296	63a73341	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/11/11 23:05	linux-next	6dd65e60af98	cca87986	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/08/08 05:26	linux-next	01830e6c042e	ff51e522	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/08/05 19:13	linux-next	01830e6c042e	b7129355	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/08/02 12:18	linux-next	01830e6c042e	63a73341	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/08/02 12:17	linux-next	01830e6c042e	63a73341	.config	log	report