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BUG: KCSAN: data-race in generic_fillattr / inode_set_ctime_current

write to 0xffff8881052d1b20 of 4 bytes by task 13256 on cpu 1:
 inode_set_ctime_to_ts fs/inode.c:2779 [inline]
 inode_set_ctime_current+0x256/0x960 fs/inode.c:2842
 shmem_xattr_handler_set+0x1ac/0x220 mm/shmem.c:4355
 __vfs_setxattr+0x2e6/0x310 fs/xattr.c:200
 __vfs_setxattr_noperm+0xe8/0x410 fs/xattr.c:234
 __vfs_setxattr_locked+0x105/0x220 fs/xattr.c:295
 vfs_setxattr+0x12c/0x2a0 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x1c4/0x410 fs/xattr.c:664
 path_setxattrat+0x2be/0x310 fs/xattr.c:708
 __do_sys_lsetxattr fs/xattr.c:749 [inline]
 __se_sys_lsetxattr fs/xattr.c:745 [inline]
 __x64_sys_lsetxattr+0x71/0x90 fs/xattr.c:745
 x64_sys_call+0x1300/0x3020 arch/x86/include/generated/asm/syscalls_64.h:190
 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 0xffff8881052d1b20 of 4 bytes by task 3304 on cpu 0:
 inode_get_ctime_nsec include/linux/fs.h:1689 [inline]
 inode_get_ctime include/linux/fs.h:1695 [inline]
 generic_fillattr+0x1d1/0x340 fs/stat.c:101
 shmem_getattr+0x181/0x200 mm/shmem.c:1302
 vfs_getattr_nosec+0x146/0x1e0 fs/stat.c:213
 vfs_getattr+0x48/0x60 fs/stat.c:262
 vfs_statx_path+0x28/0x140 fs/stat.c:299
 vfs_statx+0xc4/0x170 fs/stat.c:356
 vfs_fstatat+0x118/0x170 fs/stat.c:373
 __do_sys_newfstatat fs/stat.c:538 [inline]
 __se_sys_newfstatat+0x55/0x3e0 fs/stat.c:532
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:532
 x64_sys_call+0x2c64/0x3020 arch/x86/include/generated/asm/syscalls_64.h:263
 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: 0x318f95a9 -> 0x0efd7cb1

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3304 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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