syzbot

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BUG: KCSAN: data-race in shmem_mknod / vfs_getattr_nosec

write to 0xffff8881041ca9f8 of 8 bytes by task 3049 on cpu 1:
 shmem_mknod+0xdc/0x170 mm/shmem.c:2840
 shmem_create+0x2f/0x40 mm/shmem.c:2891
 lookup_open fs/namei.c:3280 [inline]
 open_last_lookups fs/namei.c:3350 [inline]
 path_openat+0xd2c/0x1eb0 fs/namei.c:3556
 do_filp_open+0x105/0x220 fs/namei.c:3586
 do_sys_openat2+0xb5/0x2b0 fs/open.c:1212
 do_sys_open fs/open.c:1228 [inline]
 __do_sys_openat fs/open.c:1244 [inline]
 __se_sys_openat fs/open.c:1239 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1239
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881041ca9f8 of 8 bytes by task 3051 on cpu 0:
 i_size_read include/linux/fs.h:891 [inline]
 generic_fillattr fs/stat.c:53 [inline]
 vfs_getattr_nosec+0x242/0x2f0 fs/stat.c:126
 vfs_getattr fs/stat.c:160 [inline]
 vfs_statx+0x138/0x2a0 fs/stat.c:225
 vfs_fstatat fs/stat.c:243 [inline]
 __do_sys_newfstatat fs/stat.c:412 [inline]
 __se_sys_newfstatat+0x63/0x260 fs/stat.c:406
 __x64_sys_newfstatat+0x51/0x60 fs/stat.c:406
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000000017c0 -> 0x00000000000017d4

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3051 Comm: udevd Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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