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BUG: KCSAN: data-race in evict / insert_inode_locked

write to 0xffff8880b8d0d6b8 of 8 bytes by task 15583 on cpu 0:
 hlist_add_head include/linux/list.h:787 [inline]
 insert_inode_locked+0x2db/0x3b0 fs/inode.c:1474
 __ext4_new_inode+0x17b2/0x2ec0 fs/ext4/ialloc.c:1107
 ext4_mknod+0x155/0x370 fs/ext4/namei.c:2620
 vfs_mknod fs/namei.c:3709 [inline]
 vfs_mknod+0x2e7/0x480 fs/namei.c:3688
 unix_mknod net/unix/af_unix.c:973 [inline]
 unix_bind+0x258/0x770 net/unix/af_unix.c:1014
 __sys_bind+0x1df/0x220 net/socket.c:1647
 __do_sys_bind net/socket.c:1658 [inline]
 __se_sys_bind net/socket.c:1656 [inline]
 __x64_sys_bind+0x4c/0x60 net/socket.c:1656
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880b8d0d6b8 of 8 bytes by task 7951 on cpu 1:
 inode_unhashed include/linux/fs.h:749 [inline]
 remove_inode_hash include/linux/fs.h:3075 [inline]
 evict+0x2a0/0x410 fs/inode.c:584
 iput_final fs/inode.c:1563 [inline]
 iput+0x371/0x4e0 fs/inode.c:1589
 dentry_unlink_inode+0x270/0x2e0 fs/dcache.c:374
 d_delete fs/dcache.c:2449 [inline]
 d_delete+0xdb/0xe0 fs/dcache.c:2438
 vfs_rmdir fs/namei.c:3884 [inline]
 vfs_rmdir+0x2e2/0x300 fs/namei.c:3849
 do_rmdir+0x2cb/0x300 fs/namei.c:3932
 __do_sys_rmdir fs/namei.c:3950 [inline]
 __se_sys_rmdir fs/namei.c:3948 [inline]
 __x64_sys_rmdir+0x2f/0x40 fs/namei.c:3948
 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: 7951 Comm: syz-executor.2 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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