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BUG: KCSAN: data-race in atime_needs_update / inode_set_ctime_current

write to 0xffff8881049d7250 of 8 bytes by task 4949 on cpu 0:
 inode_set_ctime_current+0x4ea/0x7a0 fs/inode.c:2811
 shmem_unlink+0x114/0x170 mm/shmem.c:3804
 vfs_unlink+0x275/0x430 fs/namei.c:4523
 do_unlinkat+0x237/0x4d0 fs/namei.c:4587
 __do_sys_unlink fs/namei.c:4635 [inline]
 __se_sys_unlink fs/namei.c:4633 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4633
 x64_sys_call+0x2329/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:88
 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 0xffff8881049d7250 of 8 bytes by task 3020 on cpu 1:
 inode_get_ctime_sec include/linux/fs.h:1673 [inline]
 inode_get_ctime include/linux/fs.h:1683 [inline]
 relatime_need_update fs/inode.c:2025 [inline]
 atime_needs_update+0x2ed/0x3e0 fs/inode.c:2165
 touch_atime+0x4a/0x350 fs/inode.c:2180
 do_readlinkat+0x12b/0x210 fs/stat.c:575
 __do_sys_readlink fs/stat.c:599 [inline]
 __se_sys_readlink fs/stat.c:596 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:596
 x64_sys_call+0x28ba/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:90
 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: 0x000000006743ba79 -> 0x000000006743ba7a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3020 Comm: udevd Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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