MDEV-24449 Corruption of system tablespace or last recovered page

This corresponds to 10.5 commit 39378e1366.

With a patched version of the test innodb.ibuf_not_empty (so that
it would trigger crash recovery after using the change buffer),
and patched code that would modify the os_thread_sleep() in
recv_apply_hashed_log_recs() to be 1ms as well as add a sleep of
the same duration to the end of recv_recover_page() when
recv_sys->n_addrs=0, we can demonstrate a race condition.

After disabling some debug checks in buf_all_freed_instance(),
buf_pool_invalidate_instance() and buf_validate(), we managed to
trigger an assertion failure in fseg_free_step(), on the XDES_FREE_BIT.
In other words, an trx_undo_seg_free() call during
trx_rollback_resurrected() was attempting a double-free of a page.
This was repeated about once in 400 to 500 test runs. With the fix
applied, the test passed 2,000 runs.

recv_apply_hashed_log_recs(): Do not only wait for recv_sys->n_addrs
to reach 0, but also wait for buf_get_n_pending_read_ios() to reach 0,
to guarantee that buf_page_io_complete() will not be executing
ibuf_merge_or_delete_for_page().

storage/innobase/log/log0recv.cc

@@ -2501,7 +2501,7 @@ apply:
 
 	/* Wait until all the pages have been processed */
 
-	while (recv_sys->n_addrs != 0) {
+	while (recv_sys->n_addrs || buf_get_n_pending_read_ios()) {
 		const bool abort = recv_sys->found_corrupt_log
 			|| recv_sys->found_corrupt_fs;