syzbot

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BUG: KCSAN: data-race in atime_needs_update / inode_set_ctime_current

write to 0xffff88811bd06f68 of 8 bytes by task 27040 on cpu 1:
 inode_set_ctime_current+0x5f2/0x960 fs/inode.c:2874
 __simple_unlink fs/libfs.c:793 [inline]
 simple_unlink+0x2d/0x80 fs/libfs.c:808
 shmem_unlink+0x12d/0x140 mm/shmem.c:4005
 vfs_unlink+0x1c7/0x490 fs/namei.c:5470
 filename_unlinkat+0x1e2/0x410 fs/namei.c:5540
 __do_sys_unlink fs/namei.c:5575 [inline]
 __se_sys_unlink+0x2b/0xe0 fs/namei.c:5572
 __x64_sys_unlink+0x1f/0x30 fs/namei.c:5572
 x64_sys_call+0x2eb6/0x3020 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811bd06f68 of 8 bytes by task 2999 on cpu 0:
 inode_get_ctime_sec include/linux/fs.h:1684 [inline]
 inode_get_ctime include/linux/fs.h:1694 [inline]
 relatime_need_update fs/inode.c:2080 [inline]
 atime_needs_update+0x2ef/0x3e0 fs/inode.c:2238
 touch_atime+0x4a/0x330 fs/inode.c:2253
 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+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000077359465 -> 0x0000000077359466

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2999 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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