syzbot

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BUG: KCSAN: data-race in do_sys_poll / pollwake

write to 0xffffc90001fb3c50 of 4 bytes by task 8832 on cpu 1:
 __pollwake fs/select.c:198 [inline]
 pollwake+0xb9/0x110 fs/select.c:218
 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:107
 __wake_up_common_lock kernel/sched/wait.c:137 [inline]
 __wake_up+0x80/0xc0 kernel/sched/wait.c:156
 unix_dgram_peer_wake_relay+0xe9/0x110 net/unix/af_unix.c:425
 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:107
 __wake_up_common_lock kernel/sched/wait.c:137 [inline]
 __wake_up_sync_key+0x83/0xc0 kernel/sched/wait.c:204
 __unix_dgram_recvmsg+0x3c8/0x8b0 net/unix/af_unix.c:2416
 unix_dgram_recvmsg+0x81/0x90 net/unix/af_unix.c:2487
 ____sys_recvmsg+0x162/0x2f0
 ___sys_recvmsg net/socket.c:2706 [inline]
 do_recvmmsg+0x53a/0xa30 net/socket.c:2800
 __sys_recvmmsg net/socket.c:2879 [inline]
 __do_sys_recvmmsg net/socket.c:2902 [inline]
 __se_sys_recvmmsg net/socket.c:2895 [inline]
 __x64_sys_recvmmsg+0xde/0x160 net/socket.c:2895
 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 0xffffc90001fb3c50 of 4 bytes by task 8837 on cpu 0:
 poll_schedule_timeout fs/select.c:243 [inline]
 do_poll fs/select.c:965 [inline]
 do_sys_poll+0xa47/0xca0 fs/select.c:1015
 __do_sys_ppoll fs/select.c:1121 [inline]
 __se_sys_ppoll+0x195/0x1d0 fs/select.c:1101
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1101
 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: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8837 Comm: syz-executor.2 Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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