syzbot

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BUG: KCSAN: data-race in do_select / pollwake

write to 0xffffc90000813a70 of 4 bytes by task 1827 on cpu 0:
 __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_sync_key+0x83/0xc0 kernel/sched/wait.c:204
 pipe_write+0xa3f/0xdd0 fs/pipe.c:594
 call_write_iter include/linux/fs.h:2187 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:578
 ksys_write+0xe8/0x1a0 fs/read_write.c:631
 __do_sys_write fs/read_write.c:643 [inline]
 __se_sys_write fs/read_write.c:640 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:640
 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+0x63/0xcd

read to 0xffffc90000813a70 of 4 bytes by task 1795 on cpu 1:
 poll_schedule_timeout fs/select.c:243 [inline]
 do_select+0xf2e/0x1020 fs/select.c:607
 core_sys_select+0x368/0x520 fs/select.c:681
 do_pselect fs/select.c:763 [inline]
 __do_sys_pselect6+0x1f4/0x250 fs/select.c:804
 __se_sys_pselect6 fs/select.c:795 [inline]
 __x64_sys_pselect6+0x74/0x80 fs/select.c:795
 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+0x63/0xcd

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1795 Comm: sshd Not tainted 6.0.0-rc7-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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