syzbot

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BUG: KCSAN: data-race in atime_needs_update / inode_set_ctime_current

write to 0xffff88811c15fb08 of 8 bytes by task 3525 on cpu 1:
 inode_set_ctime_current+0x524/0x760 fs/inode.c:2840
 __simple_unlink fs/libfs.c:791 [inline]
 simple_unlink+0x2d/0x80 fs/libfs.c:806
 shmem_unlink+0x12d/0x140 mm/shmem.c:3991
 vfs_unlink+0x28b/0x440 fs/namei.c:5369
 do_unlinkat+0x1cd/0x4b0 fs/namei.c:5439
 __do_sys_unlink fs/namei.c:5474 [inline]
 __se_sys_unlink fs/namei.c:5472 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:5472
 x64_sys_call+0x2f48/0x3000 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811c15fb08 of 8 bytes by task 3003 on cpu 0:
 inode_get_ctime_sec include/linux/fs.h:1683 [inline]
 inode_get_ctime include/linux/fs.h:1693 [inline]
 relatime_need_update fs/inode.c:2068 [inline]
 atime_needs_update+0x2ef/0x3e0 fs/inode.c:2208
 touch_atime+0x4a/0x340 fs/inode.c:2223
 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+0x2af1/0x3000 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xca/0x2b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000006948a363 -> 0x000000006948a364

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3003 Comm: udevd Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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