syzbot

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BUG: KCSAN: data-race in __skb_wait_for_more_packets / inet_shutdown

read-write to 0xffff888128030ce2 of 1 bytes by task 17746 on cpu 0:
 inet_shutdown+0x139/0x1f0 net/ipv4/af_inet.c:888
 __sys_shutdown_sock net/socket.c:2331 [inline]
 __sys_shutdown net/socket.c:2343 [inline]
 __do_sys_shutdown net/socket.c:2351 [inline]
 __se_sys_shutdown+0xf6/0x140 net/socket.c:2349
 __x64_sys_shutdown+0x2d/0x40 net/socket.c:2349
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff888128030ce2 of 1 bytes by task 17740 on cpu 1:
 __skb_wait_for_more_packets+0xe8/0x2f0 net/core/datagram.c:104
 __skb_recv_udp+0x731/0x850 net/ipv4/udp.c:1789
 udpv6_recvmsg+0x22e/0xd00 net/ipv6/udp.c:346
 inet6_recvmsg+0x9e/0x210 net/ipv6/af_inet6.c:671
 ____sys_recvmsg+0x162/0x2f0
 ___sys_recvmsg net/socket.c:2753 [inline]
 do_recvmmsg+0x53a/0xa30 net/socket.c:2847
 __sys_recvmmsg net/socket.c:2926 [inline]
 __do_sys_recvmmsg net/socket.c:2949 [inline]
 __se_sys_recvmmsg net/socket.c:2942 [inline]
 __x64_sys_recvmmsg+0xde/0x160 net/socket.c:2942
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17740 Comm: syz-executor.3 Not tainted 5.19.0-rc2-syzkaller-00205-g462abc9de7a1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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