syzbot

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BUG: KCSAN: data-race in __ip4_datagram_connect / raw_sendmsg

write to 0xffff888145f68c00 of 4 bytes by task 6606 on cpu 1:
 __ip4_datagram_connect+0x6dd/0x7b0 net/ipv4/datagram.c:71
 ip4_datagram_connect+0x2e/0x40 net/ipv4/datagram.c:90
 inet_dgram_connect+0x114/0x1a0 net/ipv4/af_inet.c:580
 __sys_connect_file net/socket.c:1992 [inline]
 __sys_connect+0x1a1/0x1b0 net/socket.c:2009
 __do_sys_connect net/socket.c:2019 [inline]
 __se_sys_connect net/socket.c:2016 [inline]
 __x64_sys_connect+0x41/0x50 net/socket.c:2016
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888145f68c00 of 4 bytes by task 6620 on cpu 0:
 raw_sendmsg+0x25b/0xea0
 inet_sendmsg+0x63/0x80 net/ipv4/af_inet.c:830
 sock_sendmsg_nosec net/socket.c:725 [inline]
 sock_sendmsg net/socket.c:748 [inline]
 ____sys_sendmsg+0x37c/0x4d0 net/socket.c:2494
 ___sys_sendmsg net/socket.c:2548 [inline]
 __sys_sendmmsg+0x269/0x500 net/socket.c:2634
 __do_sys_sendmmsg net/socket.c:2663 [inline]
 __se_sys_sendmmsg net/socket.c:2660 [inline]
 __x64_sys_sendmmsg+0x57/0x60 net/socket.c:2660
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xaa1414ac -> 0x010000e0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6620 Comm: syz-executor.0 Not tainted 6.5.0-rc3-syzkaller-00024-g18b44bc5a672 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
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