KCSAN: data-race in __skb_wait_for_more_packets / inet

KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown
Status: auto-closed as invalid on 2020/06/07 18:23
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 682d, last: 545d

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown (5)	2	97d	104d	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	142d	142d	0/22	auto-closed as invalid on 2021/06/10 09:09
upstream	KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown (3)	4	234d	292d	0/22	auto-closed as invalid on 2021/03/10 20:35
upstream	KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown (2)	3	353d	389d	0/22	auto-closed as invalid on 2020/11/11 11:35

Sample crash report:

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

write to 0xffff888094a07cea of 1 bytes by task 11871 on cpu 1:
 inet_shutdown+0xf3/0x240 net/ipv4/af_inet.c:877
 __sys_shutdown+0x91/0x110 net/socket.c:2206
 __do_sys_shutdown net/socket.c:2214 [inline]
 __se_sys_shutdown net/socket.c:2212 [inline]
 __x64_sys_shutdown+0x35/0x50 net/socket.c:2212
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888094a07cea of 1 bytes by task 11866 on cpu 0:
 __skb_wait_for_more_packets+0x193/0x340 net/core/datagram.c:105
 __skb_recv_udp+0x3d7/0x580 net/ipv4/udp.c:1712
 udpv6_recvmsg+0x2a1/0xf00 net/ipv6/udp.c:288
 inet6_recvmsg+0xc1/0x250 net/ipv6/af_inet6.c:592
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 sock_recvmsg+0x8e/0xb0 net/socket.c:900
 ____sys_recvmsg+0x144/0x350 net/socket.c:2566
 ___sys_recvmsg+0xb2/0x100 net/socket.c:2608
 do_recvmmsg+0x17a/0x540 net/socket.c:2706
 __sys_recvmmsg+0x1f1/0x200 net/socket.c:2785
 __do_sys_recvmmsg net/socket.c:2808 [inline]
 __se_sys_recvmmsg net/socket.c:2801 [inline]
 __x64_sys_recvmmsg+0x82/0xb0 net/socket.c:2801
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11866 Comm: syz-executor.5 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (8):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report
ci2-upstream-kcsan-gce	2020/03/29 18:22	https://github.com/google/ktsan.git kcsan	40959e34d670	05736b29	.config	log	report
ci2-upstream-kcsan-gce	2020/03/07 02:36	https://github.com/google/ktsan.git kcsan	941e0d917bbf	fd2a5f28	.config	log	report
ci2-upstream-kcsan-gce	2019/12/29 06:40	https://github.com/google/ktsan.git kcsan	245a43005292	af6b8ef8	.config	log	report
ci2-upstream-kcsan-gce	2019/12/08 04:20	https://github.com/google/ktsan.git kcsan	ef798c30ba4e	1508f453	.config	log	report
ci2-upstream-kcsan-gce	2019/12/02 04:52	https://github.com/google/ktsan.git kcsan	ef798c30ba4e	f879db37	.config	log	report
ci2-upstream-kcsan-gce	2019/11/25 14:18	https://github.com/google/ktsan.git kcsan	5863cc791e4c	598ca6c8	.config	log	report
ci2-upstream-kcsan-gce	2019/11/22 06:21	https://github.com/google/ktsan.git kcsan	5863cc791e4c	8098ea0f	.config	log	report
ci2-upstream-kcsan-gce	2019/11/13 10:27	https://github.com/google/ktsan.git kcsan	7f2955e0d056	048f2d49	.config	log	report