syzbot

==================================================================
BUG: KCSAN: data-race in atime_needs_update / inode_set_ctime_current

write to 0xffff88810a8649a0 of 8 bytes by task 3753 on cpu 0:
 inode_set_ctime_current+0x527/0x7a0 fs/inode.c:2763
 shmem_unlink+0x114/0x170 mm/shmem.c:3988
 vfs_unlink+0x275/0x430 fs/namei.c:4544
 do_unlinkat+0x21b/0x4b0 fs/namei.c:4608
 __do_sys_unlink fs/namei.c:4654 [inline]
 __se_sys_unlink fs/namei.c:4652 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4652
 x64_sys_call+0x2358/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810a8649a0 of 8 bytes by task 3004 on cpu 1:
 inode_get_ctime_sec include/linux/fs.h:1723 [inline]
 inode_get_ctime include/linux/fs.h:1733 [inline]
 relatime_need_update fs/inode.c:1977 [inline]
 atime_needs_update+0x2ed/0x3e0 fs/inode.c:2117
 touch_atime+0x4a/0x350 fs/inode.c:2132
 do_readlinkat+0x12d/0x210 fs/stat.c:577
 __do_sys_readlink fs/stat.c:601 [inline]
 __se_sys_readlink fs/stat.c:598 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:598
 x64_sys_call+0x2a81/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000067e3b817 -> 0x0000000067e3b818

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3004 Comm: udevd Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
==================================================================