KCSAN: data-race in netlink_getname / netlink

KCSAN: data-race in netlink_getname / netlink_insert (2)
Status: moderation: reported on 2020/12/11 10:03
Reported-by: syzbot+3e93cbddb08bb5885e8e@syzkaller.appspotmail.com
First crash: 286d, last: 1d17h

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in netlink_getname / netlink_insert				32	317d	537d	0/22	closed as invalid on 2020/06/18 14:24

Sample crash report:

==================================================================
BUG: KCSAN: data-race in netlink_getname / netlink_insert

write to 0xffff88807f4602f8 of 4 bytes by task 7874 on cpu 0:
 netlink_insert+0xe8/0x8e0 net/netlink/af_netlink.c:577
 netlink_autobind+0xae/0x160 net/netlink/af_netlink.c:840
 netlink_sendmsg+0x47c/0x7c0 net/netlink/af_netlink.c:1890
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2433
 __do_sys_sendmsg net/socket.c:2442 [inline]
 __se_sys_sendmsg net/socket.c:2440 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2440
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88807f4602f8 of 4 bytes by task 7888 on cpu 1:
 netlink_getname+0xbb/0x180 net/netlink/af_netlink.c:1126
 __sys_getsockname+0x10e/0x1a0 net/socket.c:1887
 __do_sys_getsockname net/socket.c:1902 [inline]
 __se_sys_getsockname net/socket.c:1899 [inline]
 __x64_sys_getsockname+0x3e/0x50 net/socket.c:1899
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7888 Comm: syz-executor.5 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (58):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/13 14:29	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/04/11 10:33	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/04/09 03:48	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/04/08 13:13	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/04/06 05:14	upstream	0a50438c	6a81331a	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/04/05 02:06	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/04/01 16:29	upstream	d19cc4bf	6a81331a	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/03/29 16:03	upstream	a5e13c6d	a8529b82	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/03/28 00:55	upstream	0f4498ce	a8529b82	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/03/26 02:01	upstream	00232240	6a383ecf	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/03/25 19:11	upstream	e1381380	6a383ecf	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/03/17 17:40	upstream	1df27313	fdb2bb2c	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/03/15 21:57	upstream	1e28eed1	fdb2bb2c	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/02/15 21:18	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/02/12 22:09	upstream	dcc0b490	98682e5e	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/02/11 12:48	upstream	291009f6	a52ee10a	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/01/30 04:13	upstream	bec4c296	fc9fd31e	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/01/27 17:43	upstream	2ab38c17	a0ebf917	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/01/19 17:01	upstream	1e2a199f	63631df1	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/01/18 08:55	upstream	19c329f6	fd103621	.config	log	report	info	KCSAN: data-race in netlink_getname / netlink_insert
ci2-upstream-kcsan-gce	2021/01/04 15:35	upstream	e71ba945	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/02 07:09	upstream	eda809ae	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/23 05:37	upstream	614cb589	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/21 06:39	upstream	6a447b0e	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 21:17	upstream	ec6f5e0e	8f160dd5	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/03 00:50	upstream	3bb61aa6	8c9190ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/28 10:33	upstream	c84e1efa	486f93ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/22 16:04	upstream	a349e4c6	0d27f508	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/13 15:38	upstream	585e5b17	4a7fa9b4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/07 02:59	upstream	bf3e7628	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/06 01:41	upstream	521b619a	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/03 10:21	upstream	b7cbaf59	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/29 06:06	upstream	ed8780e3	f24824d3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/20 20:24	upstream	270315b8	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/10 22:25	upstream	6f2f486d	4a77ae0b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/05 02:00	upstream	549738f1	5ef9c291	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/30 02:23	upstream	fb0155a0	5abc3f1a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/25 03:18	upstream	171d4ff7	54289b08	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/22 03:22	upstream	98477740	9e1fa68e	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/19 19:25	upstream	eb5f95f1	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/05 20:27	upstream	9322c47b	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/31 02:49	upstream	dcc5c6f0	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/29 11:46	upstream	96d454cd	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/21 07:56	upstream	da2968ff	1d75fe45	.config	log	report
ci2-upstream-kcsan-gce	2020/08/17 23:37	upstream	9123e3a7	5ce13532	.config	log	report
ci2-upstream-kcsan-gce	2020/08/12 09:45	upstream	bb5baaa9	bb3e5fe6	.config	log	report
ci2-upstream-kcsan-gce	2020/08/07 07:54	upstream	d6efb3ac	cb436c69	.config	log	report
ci2-upstream-kcsan-gce	2020/08/04 19:57	upstream	c0842fbc	80a06902	.config	log	report
ci2-upstream-kcsan-gce	2020/08/03 02:40	upstream	142c3326	96dd3623	.config	log	report
ci2-upstream-kcsan-gce	2020/08/01 10:48	upstream	7dc6fd0f	8df85ed9	.config	log	report
ci2-upstream-kcsan-gce	2020/07/30 20:35	upstream	83bdc727	b0947553	.config	log	report
ci2-upstream-kcsan-gce	2020/07/27 15:18	upstream	92ed3019	cb93dc6a	.config	log	report
ci2-upstream-kcsan-gce	2020/07/17 17:49	upstream	88825726	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/15 12:53	upstream	e9919e11	ada108d0	.config	log	report
ci2-upstream-kcsan-gce	2020/07/14 06:49	upstream	0dc589da	ce4c95b3	.config	log	report
ci2-upstream-kcsan-gce	2020/07/11 09:01	upstream	a581387e	18d18b59	.config	log	report
ci2-upstream-kcsan-gce	2020/07/03 06:55	upstream	7cc2a8ea	f30c14bf	.config	log	report