CVE-2024-35808

In the Linux kernel, the following vulnerability has been resolved:

md/dm-raid: don't call md_reap_sync_thread() directly

Currently md_reap_sync_thread() is called from raid_message() directly

without holding 'reconfig_mutex', this is definitely unsafe because

md_reap_sync_thread() can change many fields that is protected by

'reconfig_mutex'.

However, hold 'reconfig_mutex' here is still problematic because this

will cause deadlock, for example, commit 130443d60b1b ("md: refactor

idle/frozen_sync_thread() to fix deadlock").

Fix this problem by using stop_sync_thread() to unregister sync_thread,

like md/raid did.