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BUG: KCSAN: data-race in generic_fillattr / inode_set_ctime_current

write to 0xffff8881039d9cb0 of 8 bytes by task 3597 on cpu 0:
 inode_set_ctime_to_ts include/linux/fs.h:1535 [inline]
 inode_set_ctime include/linux/fs.h:1553 [inline]
 inode_set_ctime_current+0x16c/0x1d0 fs/inode.c:2541
 shmem_mknod+0x11c/0x180 mm/shmem.c:3232
 shmem_create+0x34/0x40 mm/shmem.c:3289
 lookup_open fs/namei.c:3496 [inline]
 open_last_lookups fs/namei.c:3564 [inline]
 path_openat+0xda2/0x1d10 fs/namei.c:3794
 do_filp_open+0xf6/0x200 fs/namei.c:3824
 do_sys_openat2+0xab/0x110 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1448
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881039d9cb0 of 8 bytes by task 3349 on cpu 1:
 inode_get_ctime include/linux/fs.h:1522 [inline]
 generic_fillattr+0x196/0x2b0 fs/stat.c:62
 shmem_getattr+0x187/0x200 mm/shmem.c:1139
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr fs/stat.c:172 [inline]
 vfs_statx+0x266/0x430 fs/stat.c:244
 vfs_fstatat+0xcd/0x100 fs/stat.c:295
 __do_sys_newfstatat fs/stat.c:459 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:453
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:453
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000001e11770 -> 0x000000000279adf0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3349 Comm: udevd Not tainted 6.6.0-rc6-syzkaller-00334-g1acfd2bd3f0d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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