syzbot

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BUG: KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock

write to 0xffff8881020de26a of 1 bytes by task 10612 on cpu 1:
 unix_release_sock+0x2bd/0x6a0 net/unix/af_unix.c:607
 unix_release+0x4e/0x70 net/unix/af_unix.c:990
 __sock_release net/socket.c:650 [inline]
 sock_close+0x6c/0x150 net/socket.c:1318
 __fput+0x292/0x510 fs/file_table.c:317
 ____fput+0x11/0x20 fs/file_table.c:350
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 get_signal+0xeca/0x1020 kernel/signal.c:2641
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:867
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881020de26a of 1 bytes by task 10625 on cpu 0:
 __skb_wait_for_more_packets+0xe8/0x2f0 net/core/datagram.c:106
 __unix_dgram_recvmsg+0x20c/0x8b0 net/unix/af_unix.c:2404
 unix_dgram_recvmsg net/unix/af_unix.c:2489 [inline]
 unix_seqpacket_recvmsg+0xab/0xc0 net/unix/af_unix.c:2357
 sock_recvmsg_nosec net/socket.c:948 [inline]
 sock_recvmsg net/socket.c:966 [inline]
 __sys_recvfrom+0x204/0x2c0 net/socket.c:2097
 __do_sys_recvfrom net/socket.c:2115 [inline]
 __se_sys_recvfrom net/socket.c:2111 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2111
 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+0x44/0xae

value changed: 0x00 -> 0x03

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10625 Comm: syz-executor.4 Not tainted 5.18.0-rc6-syzkaller-00015-g0ac824f379fb-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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