syzbot

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BUG: KCSAN: data-race in pollwake / pollwake

write to 0xffffc90000ebbbd0 of 4 bytes by task 3053 on cpu 0:
 __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_sync_key+0x51/0x80 kernel/sched/wait.c:173
 sock_def_readable+0x70/0x1b0 net/core/sock.c:3448
 unix_dgram_sendmsg+0xc76/0xff0 net/unix/af_unix.c:2167
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:726
 sock_write_iter+0x15e/0x1a0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0x77f/0x920 fs/read_write.c:679
 ksys_write+0xe8/0x1b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:739
 x64_sys_call+0x287e/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:2
 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

write to 0xffffc90000ebbbd0 of 4 bytes by task 3306 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_sync_key+0x51/0x80 kernel/sched/wait.c:173
 sock_def_readable+0x70/0x1b0 net/core/sock.c:3448
 __netlink_sendskb net/netlink/af_netlink.c:1268 [inline]
 netlink_broadcast_deliver net/netlink/af_netlink.c:1398 [inline]
 do_one_broadcast net/netlink/af_netlink.c:1485 [inline]
 netlink_broadcast_filtered+0x983/0xbe0 net/netlink/af_netlink.c:1530
 netlink_broadcast net/netlink/af_netlink.c:1554 [inline]
 netlink_sendmsg+0x592/0x6e0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:726
 ____sys_sendmsg+0x312/0x410 net/socket.c:2581
 ___sys_sendmsg net/socket.c:2635 [inline]
 __sys_sendmsg+0x19d/0x230 net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2672 [inline]
 __se_sys_sendmsg net/socket.c:2670 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2670
 x64_sys_call+0x2734/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:47
 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: 1 UID: 0 PID: 3306 Comm: udevd Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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