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BUG: KCSAN: data-race in do_sys_poll / pollwake

write to 0xffffc900070cfbd0 of 4 bytes by task 9199 on cpu 1:
 __pollwake fs/select.c:195 [inline]
 pollwake+0xbe/0x110 fs/select.c:215
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up+0x65/0xb0 kernel/sched/wait.c:127
 ep_poll_safewake fs/eventpoll.c:629 [inline]
 ep_poll_callback+0x499/0x5b0 fs/eventpoll.c:1385
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up+0x65/0xb0 kernel/sched/wait.c:127
 ep_poll_safewake fs/eventpoll.c:629 [inline]
 ep_poll_callback+0x499/0x5b0 fs/eventpoll.c:1385
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up+0x65/0xb0 kernel/sched/wait.c:127
 unix_dgram_peer_wake_relay+0xd4/0xf0 net/unix/af_unix.c:525
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up_sync_key+0x51/0x80 kernel/sched/wait.c:173
 __unix_dgram_recvmsg+0x3bc/0x860 net/unix/af_unix.c:2462
 unix_dgram_recvmsg+0x81/0x90 net/unix/af_unix.c:2537
 sock_recvmsg_nosec+0x107/0x140 net/socket.c:1051
 ____sys_recvmsg+0x271/0x280 net/socket.c:2819
 ___sys_recvmsg net/socket.c:2863 [inline]
 do_recvmmsg+0x2dc/0x740 net/socket.c:2957
 __sys_recvmmsg net/socket.c:3036 [inline]
 __do_sys_recvmmsg net/socket.c:3059 [inline]
 __se_sys_recvmmsg net/socket.c:3052 [inline]
 __x64_sys_recvmmsg+0xe2/0x170 net/socket.c:3052
 x64_sys_call+0x26e3/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:300
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffc900070cfbd0 of 4 bytes by task 9203 on cpu 0:
 poll_schedule_timeout fs/select.c:240 [inline]
 do_poll fs/select.c:964 [inline]
 do_sys_poll+0x986/0xc10 fs/select.c:1015
 __do_sys_ppoll fs/select.c:1121 [inline]
 __se_sys_ppoll+0x1af/0x1f0 fs/select.c:1101
 __x64_sys_ppoll+0x67/0x80 fs/select.c:1101
 x64_sys_call+0xe71/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:272
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9203 Comm: syz.3.2038 Tainted: G        W          6.12.0-rc1-syzkaller #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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