syzbot

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BUG: KCSAN: data-race in do_sys_poll / pollwake

write to 0xffffc9000f593bd0 of 4 bytes by task 13113 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
 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:1033
 ____sys_recvmsg+0x271/0x280 net/socket.c:2801
 ___sys_recvmsg net/socket.c:2845 [inline]
 do_recvmmsg+0x2aa/0x6d0 net/socket.c:2940
 __sys_recvmmsg net/socket.c:3014 [inline]
 __do_sys_recvmmsg net/socket.c:3037 [inline]
 __se_sys_recvmmsg net/socket.c:3030 [inline]
 __x64_sys_recvmmsg+0xe2/0x170 net/socket.c:3030
 x64_sys_call+0x2a9a/0x2dc0 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 0xffffc9000f593bd0 of 4 bytes by task 13121 on cpu 0:
 poll_schedule_timeout fs/select.c:240 [inline]
 do_poll fs/select.c:958 [inline]
 do_sys_poll+0x95d/0xc20 fs/select.c:1009
 __do_sys_ppoll fs/select.c:1115 [inline]
 __se_sys_ppoll+0x1af/0x1f0 fs/select.c:1095
 __x64_sys_ppoll+0x67/0x80 fs/select.c:1095
 x64_sys_call+0x2acc/0x2dc0 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: 13121 Comm: syz.1.4316 Not tainted 6.13.0-rc1-syzkaller-00337-g7503345ac5f5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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