KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for

KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data (4)
Status: auto-closed as invalid on 2021/03/28 23:05
Reported-by: syzbot+0843a6d7ab43b4fd4ad4@syzkaller.appspotmail.com
First crash: 469d, last: 240d

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data (3)	8	493d	604d	0/22	closed as invalid on 2020/06/18 14:24
upstream	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data (2)	3	690d	698d	0/22	auto-closed as invalid on 2020/02/07 16:47
upstream	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data	1	725d	725d	0/22	closed as invalid on 2019/11/19 13:44

Sample crash report:

==================================================================
BUG: KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data

write to 0xffff88810d27ee57 of 1 bytes by task 10352 on cpu 0:
 af_alg_sendmsg+0x3d8/0xd10 crypto/af_alg.c:875
 skcipher_sendmsg crypto/algif_skcipher.c:47 [inline]
 skcipher_sendmsg_nokey+0x172/0x190 crypto/algif_skcipher.c:246
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2348
 ___sys_sendmsg net/socket.c:2402 [inline]
 __sys_sendmmsg+0x335/0x4b0 net/socket.c:2492
 __do_sys_sendmmsg net/socket.c:2521 [inline]
 __se_sys_sendmmsg net/socket.c:2518 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2518
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810d27ee57 of 1 bytes by task 10350 on cpu 1:
 af_alg_wait_for_data+0x194/0x3c0 crypto/af_alg.c:774
 _skcipher_recvmsg crypto/algif_skcipher.c:65 [inline]
 skcipher_recvmsg+0x17a/0x7f0 crypto/algif_skcipher.c:157
 skcipher_recvmsg_nokey+0x12a/0x150 crypto/algif_skcipher.c:270
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 __sys_recvfrom+0x1d7/0x2a0 net/socket.c:2032
 __do_sys_recvfrom net/socket.c:2050 [inline]
 __se_sys_recvfrom net/socket.c:2046 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2046
 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: 10350 Comm: syz-executor.5 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (25):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/21 23:04	upstream	55f62bc87347	a659b3f1	.config	log	report	info	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data
ci2-upstream-kcsan-gce	2021/02/01 05:34	upstream	1048ba83fb1c	fc9fd31e	.config	log	report	info	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data
ci2-upstream-kcsan-gce	2021/01/31 07:39	upstream	8c947645151c	fc9fd31e	.config	log	report	info	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data
ci2-upstream-kcsan-gce	2021/01/19 19:04	upstream	1e2a199f6ccd	63631df1	.config	log	report	info	KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data
ci2-upstream-kcsan-gce	2020/12/30 15:03	upstream	139711f033f6	ecb8c012	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/03 13:23	upstream	34816d20f173	59ad4022	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/02 22:33	upstream	495023e4e49e	7f344fa6	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/26 10:17	upstream	3650b228f83a	a7aac492	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/24 12:28	upstream	c9c9e6a49f89	54289b08	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/23 07:47	upstream	805c6d3c1921	287cd75a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/19 08:20	upstream	92ab97adeefc	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/17 01:05	upstream	5925fa68fe82	77507d02	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/12 04:59	upstream	e8878ab82545	79fb24e2	.config	log	report
ci2-upstream-kcsan-gce	2020/08/21 06:57	upstream	da2968ff879b	1d75fe45	.config	log	report
ci2-upstream-kcsan-gce	2020/08/09 19:07	upstream	06a81c1c7db9	70301872	.config	log	report
ci2-upstream-kcsan-gce	2020/08/07 06:54	upstream	d6efb3ac3e6c	cb436c69	.config	log	report
ci2-upstream-kcsan-gce	2020/07/31 09:28	upstream	e2c46b5762c6	8df85ed9	.config	log	report
ci2-upstream-kcsan-gce	2020/07/30 19:46	upstream	83bdc7275e62	b0947553	.config	log	report
ci2-upstream-kcsan-gce	2020/07/26 00:47	upstream	04300d66f0a0	1f7cc1ca	.config	log	report
ci2-upstream-kcsan-gce	2020/07/21 17:33	upstream	4fa640dc5230	e562dd8a	.config	log	report
ci2-upstream-kcsan-gce	2020/07/17 21:43	upstream	8882572675c1	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/14 15:55	upstream	0dc589da873b	6f458026	.config	log	report
ci2-upstream-kcsan-gce	2020/07/10 18:56	upstream	42f82040ee66	56d01184	.config	log	report
ci2-upstream-kcsan-gce	2020/07/09 18:29	upstream	0bddd227f3dc	bc238812	.config	log	report
ci2-upstream-kcsan-gce	2020/07/07 23:50	upstream	aa27b32b76d0	08fc4ef1	.config	log	report