syzbot

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BUG: KCSAN: data-race in atime_needs_update / inode_set_ctime_current

write to 0xffff8881184d3538 of 8 bytes by task 6774 on cpu 1:
 inode_set_ctime_current+0x533/0x770 fs/inode.c:2810
 shmem_unlink+0x115/0x170 mm/shmem.c:3975
 vfs_unlink+0x26c/0x420 fs/namei.c:4673
 do_unlinkat+0x24e/0x480 fs/namei.c:4737
 __do_sys_unlink fs/namei.c:4783 [inline]
 __se_sys_unlink fs/namei.c:4781 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4781
 x64_sys_call+0x2dcf/0x3000 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881184d3538 of 8 bytes by task 3004 on cpu 0:
 inode_get_ctime_sec include/linux/fs.h:1864 [inline]
 inode_get_ctime include/linux/fs.h:1874 [inline]
 relatime_need_update fs/inode.c:2018 [inline]
 atime_needs_update+0x2ef/0x3e0 fs/inode.c:2158
 touch_atime+0x4a/0x340 fs/inode.c:2173
 do_readlinkat+0x134/0x320 fs/stat.c:589
 __do_sys_readlink fs/stat.c:613 [inline]
 __se_sys_readlink fs/stat.c:610 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:610
 x64_sys_call+0x28de/0x3000 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000069067755 -> 0x0000000069067756

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3004 Comm: udevd Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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