KCSAN: data-race in __skb_wait_for_more_packets / inet

KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown (3)
Status: auto-closed as invalid on 2021/03/10 20:35
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 236d, last: 176d

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown (5)	2	39d	46d	0/22	auto-closed as invalid on 2021/07/25 13:18
upstream	KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown (4)	1	84d	84d	0/22	auto-closed as invalid on 2021/06/10 09:09
upstream	KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown (2)	3	295d	331d	0/22	auto-closed as invalid on 2020/11/11 11:35
upstream	KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown	8	487d	624d	0/22	auto-closed as invalid on 2020/06/07 18:23

Sample crash report:

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

write to 0xffff88810ed4072a of 1 bytes by task 10754 on cpu 1:
 inet_shutdown+0x148/0x200 net/ipv4/af_inet.c:887
 __sys_shutdown_sock net/socket.c:2184 [inline]
 __sys_shutdown net/socket.c:2196 [inline]
 __do_sys_shutdown net/socket.c:2204 [inline]
 __se_sys_shutdown+0xf6/0x140 net/socket.c:2202
 __x64_sys_shutdown+0x2d/0x40 net/socket.c:2202
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810ed4072a of 1 bytes by task 10721 on cpu 0:
 __skb_wait_for_more_packets+0xdd/0x2e0 net/core/datagram.c:106
 __skb_recv_udp+0x749/0x870 net/ipv4/udp.c:1770
 udp_recvmsg+0x145/0xa30 net/ipv4/udp.c:1800
 inet_recvmsg+0xa3/0x210 net/ipv4/af_inet.c:848
 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+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10721 Comm: syz-executor.2 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (4):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/03 20:27	upstream	3aaf0a27ffc2	624dad51	.config	log	report	info	KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown
ci2-upstream-kcsan-gce	2021/01/02 20:02	upstream	eda809aef534	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/24 13:02	upstream	58cf05f597b0	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 14:22	upstream	b3298500b23f	0ef84591	.config	log	report	info