syzbot

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BUG: KCSAN: data-race in atime_needs_update / inode_set_ctime_current

write to 0xffff8881146423d8 of 4 bytes by task 3390 on cpu 0:
 inode_set_ctime_to_ts include/linux/fs.h:1678 [inline]
 inode_set_ctime_current+0x35/0x50 fs/inode.c:2664
 shmem_unlink+0x114/0x180 mm/shmem.c:3691
 vfs_unlink+0x275/0x430 fs/namei.c:4469
 do_unlinkat+0x236/0x4c0 fs/namei.c:4533
 __do_sys_unlink fs/namei.c:4581 [inline]
 __se_sys_unlink fs/namei.c:4579 [inline]
 __x64_sys_unlink+0x2e/0x40 fs/namei.c:4579
 x64_sys_call+0x280f/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881146423d8 of 4 bytes by task 3017 on cpu 1:
 inode_get_ctime_nsec include/linux/fs.h:1663 [inline]
 inode_get_ctime include/linux/fs.h:1669 [inline]
 relatime_need_update fs/inode.c:1956 [inline]
 atime_needs_update+0x339/0x3e0 fs/inode.c:2096
 touch_atime+0x4a/0x350 fs/inode.c:2111
 do_readlinkat+0x12b/0x210 fs/stat.c:550
 __do_sys_readlink fs/stat.c:574 [inline]
 __se_sys_readlink fs/stat.c:571 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:571
 x64_sys_call+0x13c3/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x2dd99f32 -> 0x30d48fb3

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3017 Comm: udevd Tainted: G        W          6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
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