KCSAN: data-race in inet_bind_hash / inet_send

KCSAN: data-race in inet_bind_hash / inet_send_prepare
Status: auto-closed as invalid on 2020/03/22 05:59
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 620d, last: 618d

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in inet_bind_hash / inet_send_prepare (3)	2	318d	283d	0/22	auto-closed as invalid on 2020/12/25 10:44
upstream	KCSAN: data-race in inet_bind_hash / inet_send_prepare (2)	1	388d	388d	0/22	auto-closed as invalid on 2020/10/03 00:08
upstream	KCSAN: data-race in inet_bind_hash / inet_send_prepare (4)	7	129d	158d	0/22	auto-closed as invalid on 2021/06/19 04:19

Sample crash report:

==================================================================
BUG: KCSAN: data-race in inet_bind_hash / inet_send_prepare

read to 0xffff888120a149ce of 2 bytes by task 25402 on cpu 0:
 inet_send_prepare+0x4a/0x200 net/ipv4/af_inet.c:792
 inet_sendmsg+0x37/0x90 net/ipv4/af_inet.c:804
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:659
 ____sys_sendmsg+0x49d/0x4d0 net/socket.c:2330
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2384
 __sys_sendmsg+0xa0/0x160 net/socket.c:2417
 __do_sys_sendmsg net/socket.c:2426 [inline]
 __se_sys_sendmsg net/socket.c:2424 [inline]
 __x64_sys_sendmsg+0x51/0x70 net/socket.c:2424
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888120a149ce of 2 bytes by task 25393 on cpu 1:
 inet_bind_hash+0x49/0xf0 net/ipv4/inet_hashtables.c:95
 inet_csk_get_port+0xd6f/0x12d0 net/ipv4/inet_connection_sock.c:375
 inet_autobind+0x70/0xf0 net/ipv4/af_inet.c:182
 inet_send_prepare net/ipv4/af_inet.c:793 [inline]
 inet_send_prepare+0x1d1/0x200 net/ipv4/af_inet.c:787
 inet_sendmsg+0x37/0x90 net/ipv4/af_inet.c:804
 sock_sendmsg_nosec net/socket.c:639 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:659
 ____sys_sendmsg+0x49d/0x4d0 net/socket.c:2330
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2384
 __sys_sendmsg+0xa0/0x160 net/socket.c:2417
 __do_sys_sendmsg net/socket.c:2426 [inline]
 __se_sys_sendmsg net/socket.c:2424 [inline]
 __x64_sys_sendmsg+0x51/0x70 net/socket.c:2424
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25393 Comm: syz-executor.2 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci2-upstream-kcsan-gce	2020/01/12 05:55	https://github.com/google/ktsan.git kcsan	245a43005292	4c04afaa	.config	log	report
ci2-upstream-kcsan-gce	2020/01/09 14:14	https://github.com/google/ktsan.git kcsan	245a43005292	ddc3e859	.config	log	report