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BUG: KCSAN: data-race in drop_nlink / generic_fillattr

write to 0xffff8880131b09a8 of 4 bytes by task 6536 on cpu 1:
 drop_nlink+0x37/0x90 fs/inode.c:306
 shmem_unlink+0x162/0x180 mm/shmem.c:3033
 shmem_rename2+0x2f5/0x420 mm/shmem.c:3125
 vfs_rename+0x8ef/0xe20 fs/namei.c:4310
 do_renameat2+0x56c/0x930 fs/namei.c:4457
 __do_sys_rename fs/namei.c:4503 [inline]
 __se_sys_rename fs/namei.c:4501 [inline]
 __x64_sys_rename+0x3a/0x40 fs/namei.c:4501
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880131b09a8 of 4 bytes by task 4892 on cpu 0:
 generic_fillattr+0x74/0x180 fs/stat.c:41
 shmem_getattr+0x227/0x2c0 mm/shmem.c:1075
 vfs_getattr_nosec fs/stat.c:87 [inline]
 vfs_getattr fs/stat.c:124 [inline]
 vfs_fstat+0x1c9/0x390 fs/stat.c:146
 __do_sys_newfstat fs/stat.c:386 [inline]
 __se_sys_newfstat+0x35/0x240 fs/stat.c:383
 __x64_sys_newfstat+0x2d/0x40 fs/stat.c:383
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4892 Comm: systemd-udevd Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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