syzbot

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BUG: KCSAN: data-race in do_timerfd_settime / do_timerfd_settime

write to 0xffff88811560f3d4 of 1 bytes by task 6754 on cpu 0:
 timerfd_setup_cancel fs/timerfd.c:164 [inline]
 do_timerfd_settime+0x94a/0xa30 fs/timerfd.c:478
 __do_sys_timerfd_settime fs/timerfd.c:569 [inline]
 __se_sys_timerfd_settime fs/timerfd.c:560 [inline]
 __x64_sys_timerfd_settime+0xb9/0x140 fs/timerfd.c:560
 x64_sys_call+0x2b76/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:287
 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 0xffff88811560f3d4 of 1 bytes by task 6755 on cpu 1:
 timerfd_canceled fs/timerfd.c:151 [inline]
 timerfd_setup fs/timerfd.c:225 [inline]
 do_timerfd_settime+0x867/0xa30 fs/timerfd.c:521
 __do_sys_timerfd_settime fs/timerfd.c:569 [inline]
 __se_sys_timerfd_settime fs/timerfd.c:560 [inline]
 __x64_sys_timerfd_settime+0xb9/0x140 fs/timerfd.c:560
 x64_sys_call+0x2b76/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:287
 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: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6755 Comm: syz.2.994 Tainted: G        W          6.14.0-rc4-syzkaller #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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netlink: 'syz.2.994': attribute type 10 has an invalid length.