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BUG: KCSAN: data-race in drop_nlink / generic_fillattr

write to 0xffff888107fd9490 of 4 bytes by task 16736 on cpu 1:
 drop_nlink+0x37/0x90 fs/inode.c:309
 shmem_unlink+0x1ab/0x1d0 mm/shmem.c:2933
 shmem_rename2+0x2fd/0x440 mm/shmem.c:3029
 vfs_rename+0x9d9/0xe20 fs/namei.c:4628
 do_renameat2+0x6d7/0xa20 fs/namei.c:4779
 __do_sys_rename fs/namei.c:4825 [inline]
 __se_sys_rename fs/namei.c:4823 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4823
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888107fd9490 of 4 bytes by task 16730 on cpu 0:
 generic_fillattr+0x76/0x190 fs/stat.c:49
 shmem_getattr+0x23a/0x260 mm/shmem.c:1075
 vfs_getattr_nosec+0x153/0x2f0 fs/stat.c:123
 vfs_getattr fs/stat.c:160 [inline]
 vfs_fstat fs/stat.c:182 [inline]
 __do_sys_newfstat fs/stat.c:422 [inline]
 __se_sys_newfstat+0xa5/0x2c0 fs/stat.c:419
 __x64_sys_newfstat+0x2d/0x40 fs/stat.c:419
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16730 Comm: systemd-udevd Tainted: G        W         5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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