KCSAN: data-race in do_recvmmsg / do

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in do_recvmmsg / do_recvmmsg (2) net				1	415d	390d	22/26	fixed on 2023/07/01 16:05

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BUG: KCSAN: data-race in do_recvmmsg / do_recvmmsg

write to 0xffff888102dd6230 of 4 bytes by task 26756 on cpu 0:
 do_recvmmsg+0x923/0x9e0 net/socket.c:2761
 __sys_recvmmsg net/socket.c:2784 [inline]
 __do_sys_recvmmsg net/socket.c:2807 [inline]
 __se_sys_recvmmsg net/socket.c:2800 [inline]
 __x64_sys_recvmmsg+0xcf/0x150 net/socket.c:2800
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102dd6230 of 4 bytes by task 26770 on cpu 1:
 sock_error include/net/sock.h:2267 [inline]
 do_recvmmsg+0x178/0x9e0 net/socket.c:2682
 __sys_recvmmsg net/socket.c:2786 [inline]
 __do_sys_recvmmsg net/socket.c:2807 [inline]
 __se_sys_recvmmsg net/socket.c:2800 [inline]
 __x64_sys_recvmmsg+0xe6/0x150 net/socket.c:2800
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 26770 Comm: syz-executor.2 Not tainted 5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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