syzbot

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BUG: KCSAN: data-race in atime_needs_update / inode_set_ctime_current

write to 0xffff888104d6d970 of 4 bytes by task 3288 on cpu 1:
 inode_set_ctime_to_ts fs/inode.c:2840 [inline]
 inode_set_ctime_current+0x25b/0x8e0 fs/inode.c:2903
 __simple_unlink fs/libfs.c:792 [inline]
 simple_unlink+0x2d/0x80 fs/libfs.c:807
 shmem_unlink+0x12d/0x140 mm/shmem.c:3917
 shmem_rename2+0x185/0x310 mm/shmem.c:3998
 vfs_rename+0x963/0xac0 fs/namei.c:6070
 filename_renameat2+0x3a4/0x6a0 fs/namei.c:6188
 __do_sys_rename fs/namei.c:6232 [inline]
 __se_sys_rename+0x4a/0x1c0 fs/namei.c:6228
 __x64_sys_rename+0x31/0x40 fs/namei.c:6228
 x64_sys_call+0x2b3/0x3020 arch/x86/include/generated/asm/syscalls_64.h:83
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888104d6d970 of 4 bytes by task 3286 on cpu 0:
 inode_get_ctime_nsec include/linux/fs.h:1690 [inline]
 inode_get_ctime include/linux/fs.h:1696 [inline]
 relatime_need_update fs/inode.c:2136 [inline]
 atime_needs_update+0x333/0x3e0 fs/inode.c:2300
 touch_atime+0x4a/0x300 fs/inode.c:2315
 do_readlinkat+0x137/0x2f0 fs/stat.c:582
 __do_sys_readlink fs/stat.c:605 [inline]
 __se_sys_readlink fs/stat.c:602 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:602
 x64_sys_call+0x2b51/0x3020 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x001fd1b2 -> 0x00e0c0c9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3286 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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