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BUG: KCSAN: data-race in generic_fillattr / shmem_mknod

write to 0xffff88812625d198 of 16 bytes by task 17260 on cpu 0:
 shmem_mknod+0x12f/0x180 mm/shmem.c:2898
 shmem_create+0x34/0x50 mm/shmem.c:2945
 lookup_open fs/namei.c:3309 [inline]
 do_last fs/namei.c:3401 [inline]
 path_openat+0x29cd/0x3150 fs/namei.c:3607
 do_filp_open+0x11e/0x1b0 fs/namei.c:3637
 do_sys_openat2+0x4f5/0x620 fs/open.c:1149
 do_sys_open+0xa3/0x110 fs/open.c:1165
 ksys_open include/linux/syscalls.h:1386 [inline]
 __do_sys_open fs/open.c:1171 [inline]
 __se_sys_open fs/open.c:1169 [inline]
 __x64_sys_open+0x55/0x70 fs/open.c:1169
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812625d198 of 16 bytes by task 17266 on cpu 1:
 generic_fillattr+0x16a/0x1e0 fs/stat.c:47
 vfs_getattr_nosec+0x160/0x170 fs/stat.c:86
 vfs_getattr+0x54/0x70 fs/stat.c:120
 vfs_statx+0x108/0x190 fs/stat.c:201
 vfs_stat include/linux/fs.h:3271 [inline]
 __do_sys_newstat+0x51/0xb0 fs/stat.c:351
 __se_sys_newstat fs/stat.c:347 [inline]
 __x64_sys_newstat+0x3a/0x50 fs/stat.c:347
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17266 Comm: udevd Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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