syzbot

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BUG: KCSAN: data-race in generic_fillattr / shmem_unlink

read to 0xffff888126f7e3c8 of 8 bytes by task 12281 on cpu 0:
 generic_fillattr+0xf5/0x1e0 fs/stat.c:42
 vfs_getattr_nosec+0x160/0x170 fs/stat.c:84
 vfs_getattr+0x54/0x70 fs/stat.c:118
 vfs_statx+0x102/0x190 fs/stat.c:191
 vfs_stat include/linux/fs.h:3242 [inline]
 __do_sys_newstat+0x51/0xb0 fs/stat.c:341
 __se_sys_newstat fs/stat.c:337 [inline]
 __x64_sys_newstat+0x3a/0x50 fs/stat.c:337
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888126f7e3c8 of 8 bytes by task 12317 on cpu 1:
 shmem_unlink+0xa2/0x150 mm/shmem.c:2980
 shmem_rename2+0x10f/0x4a0 mm/shmem.c:3074
 vfs_rename+0x87d/0x10b0 fs/namei.c:4469
 do_renameat2+0x9e3/0xa50 fs/namei.c:4619
 __do_sys_rename fs/namei.c:4665 [inline]
 __se_sys_rename fs/namei.c:4663 [inline]
 __x64_sys_rename+0x47/0x60 fs/namei.c:4663
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12317 Comm: udevd Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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