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BUG: KCSAN: data-race in generic_fillattr / shmem_unlink

write to 0xffff888126016750 of 8 bytes by task 7960 on cpu 0:
 shmem_unlink+0xa2/0x150 mm/shmem.c:2986
 shmem_rename2+0x10f/0x4a0 mm/shmem.c:3080
 vfs_rename+0x87d/0x10b0 fs/namei.c:4551
 do_renameat2+0x9e3/0xa50 fs/namei.c:4701
 __do_sys_rename fs/namei.c:4747 [inline]
 __se_sys_rename fs/namei.c:4745 [inline]
 __x64_sys_rename+0x47/0x60 fs/namei.c:4745
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888126016750 of 8 bytes by task 8209 on cpu 1:
 generic_fillattr+0xf5/0x1e0 fs/stat.c:44
 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: 8209 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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