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BUG: KCSAN: data-race in atime_needs_update / touch_atime

read to 0xffff88812aa35e78 of 4 bytes by task 18656 on cpu 1:
 atime_needs_update+0x25f/0x3e0 fs/inode.c:-1
 touch_atime+0x4a/0x330 fs/inode.c:2253
 file_accessed include/linux/fs.h:2264 [inline]
 iterate_dir+0x28b/0x330 fs/readdir.c:113
 __do_sys_getdents64 fs/readdir.c:399 [inline]
 __se_sys_getdents64+0xd2/0x230 fs/readdir.c:384
 __x64_sys_getdents64+0x43/0x50 fs/readdir.c:384
 x64_sys_call+0x2408/0x3020 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff88812aa35e78 of 4 bytes by task 13667 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1626 [inline]
 inode_update_atime fs/inode.c:2098 [inline]
 inode_update_time fs/inode.c:2162 [inline]
 generic_update_time fs/inode.c:2195 [inline]
 touch_atime+0x1d7/0x330 fs/inode.c:2273
 file_accessed include/linux/fs.h:2264 [inline]
 iterate_dir+0x28b/0x330 fs/readdir.c:113
 __do_sys_getdents64 fs/readdir.c:399 [inline]
 __se_sys_getdents64+0xd2/0x230 fs/readdir.c:384
 __x64_sys_getdents64+0x43/0x50 fs/readdir.c:384
 x64_sys_call+0x2408/0x3020 arch/x86/include/generated/asm/syscalls_64.h:218
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x37d5d579 -> 0x380e2541

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 13667 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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