syzbot

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BUG: KCSAN: data-race in atime_needs_update / inode_set_ctime_current

write to 0xffff888104358f70 of 8 bytes by task 7839 on cpu 0:
 inode_set_ctime_current+0x533/0x770 fs/inode.c:2763
 shmem_unlink+0x115/0x170 mm/shmem.c:3975
 vfs_unlink+0x269/0x420 fs/namei.c:4579
 do_unlinkat+0x28e/0x4c0 fs/namei.c:4643
 __do_sys_unlink fs/namei.c:4689 [inline]
 __se_sys_unlink fs/namei.c:4687 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4687
 x64_sys_call+0x22a6/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888104358f70 of 8 bytes by task 3004 on cpu 1:
 inode_get_ctime_sec include/linux/fs.h:1731 [inline]
 inode_get_ctime include/linux/fs.h:1741 [inline]
 relatime_need_update fs/inode.c:1977 [inline]
 atime_needs_update+0x2ef/0x3e0 fs/inode.c:2117
 touch_atime+0x4a/0x330 fs/inode.c:2132
 do_readlinkat+0x134/0x320 fs/stat.c:581
 __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+0x2cf3/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x000000006819810f -> 0x0000000068198110

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3004 Comm: udevd Not tainted 6.15.0-rc5-syzkaller-00022-g01f95500a162 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
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