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BUG: KCSAN: data-race in generic_fillattr / touch_atime

read to 0xffff888117d16c88 of 4 bytes by task 3732 on cpu 0:
 inode_get_atime_nsec include/linux/fs.h:1659 [inline]
 inode_get_atime include/linux/fs.h:1665 [inline]
 generic_fillattr+0x16f/0x330 fs/stat.c:96
 shmem_getattr+0x17b/0x200 mm/shmem.c:1249
 vfs_getattr_nosec fs/stat.c:208 [inline]
 vfs_getattr+0x172/0x1b0 fs/stat.c:246
 vfs_fstat fs/stat.c:265 [inline]
 vfs_fstatat+0xa7/0x130 fs/stat.c:366
 __do_sys_newfstatat fs/stat.c:532 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:526
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:526
 x64_sys_call+0x236d/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:263
 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

write to 0xffff888117d16c88 of 4 bytes by task 3734 on cpu 1:
 inode_set_atime_to_ts include/linux/fs.h:1674 [inline]
 inode_update_timestamps fs/inode.c:2083 [inline]
 generic_update_time fs/inode.c:2105 [inline]
 inode_update_time fs/inode.c:2125 [inline]
 touch_atime+0x1f3/0x350 fs/inode.c:2197
 file_accessed include/linux/fs.h:2601 [inline]
 shmem_file_read_iter+0x46a/0x540 mm/shmem.c:3434
 new_sync_read fs/read_write.c:484 [inline]
 vfs_read+0x5cc/0x6f0 fs/read_write.c:565
 ksys_read+0xe8/0x1b0 fs/read_write.c:708
 __do_sys_read fs/read_write.c:717 [inline]
 __se_sys_read fs/read_write.c:715 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:715
 x64_sys_call+0x2874/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:1
 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: 0x0e33bf1f -> 0x0e53403a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3734 Comm: udevd Not tainted 6.14.0-rc2-syzkaller-00303-gad1b832bf1cf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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