syzbot

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BUG: KCSAN: data-race in atime_needs_update / inode_set_ctime_current

write to 0xffff888101b3f2f0 of 8 bytes by task 3088 on cpu 0:
 inode_set_ctime_to_ts include/linux/fs.h:1626 [inline]
 inode_set_ctime_current+0x38/0x50 fs/inode.c:2515
 shmem_unlink+0x114/0x190 mm/shmem.c:3395
 vfs_unlink+0x265/0x3f0 fs/namei.c:4335
 do_unlinkat+0x236/0x4c0 fs/namei.c:4399
 __do_sys_unlink fs/namei.c:4447 [inline]
 __se_sys_unlink fs/namei.c:4445 [inline]
 __x64_sys_unlink+0x30/0x40 fs/namei.c:4445
 x64_sys_call+0x286b/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888101b3f2f0 of 8 bytes by task 2786 on cpu 1:
 inode_get_ctime include/linux/fs.h:1620 [inline]
 relatime_need_update fs/inode.c:1820 [inline]
 atime_needs_update+0x36b/0x3f0 fs/inode.c:1960
 touch_atime+0x4a/0x350 fs/inode.c:1975
 do_readlinkat+0x164/0x210 fs/stat.c:510
 __do_sys_readlink fs/stat.c:532 [inline]
 __se_sys_readlink fs/stat.c:529 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:529
 x64_sys_call+0x2613/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000001b58822 -> 0x00000000037f4ba2

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2786 Comm: udevd Tainted: G        W          6.9.0-rc5-syzkaller-00042-ge88c4cfcb7b8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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