KCSAN: data-race in inet_shutdown / sk_stream_wait

KCSAN: data-race in inet_shutdown / sk_stream_wait_memory (5)
Status: auto-closed as invalid on 2021/05/12 16:03
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 203d, last: 203d

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in inet_shutdown / sk_stream_wait_memory (3)	1	410d	410d	0/22	auto-closed as invalid on 2020/10/17 16:12
upstream	KCSAN: data-race in inet_shutdown / sk_stream_wait_memory (2)	1	540d	540d	0/22	auto-closed as invalid on 2020/06/18 13:43
upstream	KCSAN: data-race in inet_shutdown / sk_stream_wait_memory	1	697d	697d	0/22	auto-closed as invalid on 2020/02/09 04:17
upstream	KCSAN: data-race in inet_shutdown / sk_stream_wait_memory (4)	2	252d	271d	0/22	auto-closed as invalid on 2021/03/25 00:19

Sample crash report:

==================================================================
BUG: KCSAN: data-race in inet_shutdown / sk_stream_wait_memory

write to 0xffff8880645777ea of 1 bytes by task 20219 on cpu 1:
 inet_shutdown+0x148/0x200 net/ipv4/af_inet.c:891
 __sys_shutdown_sock net/socket.c:2189 [inline]
 __sys_shutdown net/socket.c:2201 [inline]
 __do_sys_shutdown net/socket.c:2209 [inline]
 __se_sys_shutdown+0xf6/0x140 net/socket.c:2207
 __x64_sys_shutdown+0x2d/0x40 net/socket.c:2207
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8880645777ea of 1 bytes by task 20211 on cpu 0:
 sk_stream_wait_memory+0x46d/0x700 net/core/stream.c:145
 tcp_sendmsg_locked+0x995/0x21e0 net/ipv4/tcp.c:1417
 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1457
 inet_sendmsg+0x5f/0x80 net/ipv4/af_inet.c:821
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 __sys_sendto+0x2a8/0x370 net/socket.c:1977
 __do_sys_sendto net/socket.c:1989 [inline]
 __se_sys_sendto net/socket.c:1985 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:1985
 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: 0 PID: 20211 Comm: syz-executor.3 Tainted: G        W         5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci2-upstream-kcsan-gce	2021/04/07 16:02	upstream	2d743660786e	6a81331a	.config	log	report			info	KCSAN: data-race in inet_shutdown / sk_stream_wait_memory