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BUG: KCSAN: data-race in evict / insert_inode_locked

write to 0xffff88812a71aaa8 of 8 bytes by task 12655 on cpu 1:
 hlist_add_head include/linux/list.h:787 [inline]
 insert_inode_locked+0x2db/0x3b0 fs/inode.c:1474
 __ext4_new_inode+0x1854/0x3070 fs/ext4/ialloc.c:1107
 ext4_symlink+0x30e/0x970 fs/ext4/namei.c:3262
 vfs_symlink fs/namei.c:4119 [inline]
 vfs_symlink+0x218/0x310 fs/namei.c:4105
 do_symlinkat+0x1a5/0x1e0 fs/namei.c:4146
 __do_sys_symlink fs/namei.c:4165 [inline]
 __se_sys_symlink fs/namei.c:4163 [inline]
 __x64_sys_symlink+0x3f/0x50 fs/namei.c:4163
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812a71aaa8 of 8 bytes by task 12650 on cpu 0:
 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+0x27a/0x2f0 fs/dcache.c:374
 __dentry_kill+0x220/0x3c0 fs/dcache.c:579
 dentry_kill fs/dcache.c:698 [inline]
 dput+0x3b5/0x750 fs/dcache.c:859
 ovl_make_workdir fs/overlayfs/super.c:1117 [inline]
 ovl_get_workdir fs/overlayfs/super.c:1191 [inline]
 ovl_fill_super+0xd24/0x2736 fs/overlayfs/super.c:1611
 mount_nodev+0x6b/0xf0 fs/super.c:1461
 ovl_mount+0x36/0x50 fs/overlayfs/super.c:1712
 legacy_get_tree+0x7e/0xf0 fs/fs_context.c:647
 vfs_get_tree+0x56/0x1a0 fs/super.c:1545
 do_new_mount fs/namespace.c:2823 [inline]
 do_mount+0x1071/0x15a0 fs/namespace.c:3143
 ksys_mount+0xe8/0x160 fs/namespace.c:3352
 __do_sys_mount fs/namespace.c:3366 [inline]
 __se_sys_mount fs/namespace.c:3363 [inline]
 __x64_sys_mount+0x70/0x90 fs/namespace.c:3363

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12650 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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