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520. By Laurynas Biveinis

Fix bug 1255551 (Tc_log_page_size should be unflushable or server
crashes if 2 XA SEs installed) / upstream

The issue is FLUSH STATUS resetting tc_log_page_size to zero and a
later TC_LOG_MMAP::unlog() attempt to divide by it.

Fixed by making it unflushable.

519. By Laurynas Biveinis

Fix bug 1255549 (Crash on startup when XA support functions activated
by a second engine) / http://bugs.mysql.com/bug.php?id=47134.

The fix is a combination of:

- disabling of code in ha_recover() that asserts if more than one XA
  SE is installed;

- MariaDB revisions 2502.102.122, 2502.102.167 (minus PBXT testcase),
  2502.565.20, 2502.102.215 (minus PBXT testcase and a bit that was
  later reverted as MDEV-3850) in lp:maria/5.5. They address:

  - TC_LOG_MMAP::open() performed incorrect pointer arithmetics to set
    the end pointer for each page by adding tc_log_page_size
    (byte-sized) number of XIDs (ulonglong-sized).
  - TC_LOG_MMAP::PAGE::ptr field was never initialized.
  - TC_LOG_MMAP::pool reads and writes in
    TC_LOG_MMAP::get_active_from_pool() failed to be protected by
    TC_LOG_MMAP::LOCK_pool if !syncing.
  - If TC_LOG_MMAP::get_active_from_pool() sees that the first page in
    the pool has no waiters, it returns it as an active page, and
    fails to check whether there is any free space on it.
  - active->free and active->size were accessed without active->lock
    protection in TC_LOG_MMAP::get_active_from_pool().
  - tc_log_cur_pages_used was not protected from race conditions in
    bumping it.
  - The TC_LOG_MMAP::log_xid() return value check was inverted in
  - active == NULL in TC_LOG_MMAP::log_xid() would result in the new
    active page lock locked twice.
  - LOCK_active was released too early in TC_LOG_MMAP::log_xid(),
    resulting in TC_LOG_MMAP::active access race conditions.
  - There was a lock order violation between LOCK_sync and page locks
    in TC_LOG_MMAP::log_xid().
  - LOCK_active was held needlessly, and page field accesses were not
    protected by a page lock in TC_LOG_MMAP::log_xid() if
    TC_LOG_MMAP::syncing != NULL.
  - TC_LOG_MMAP::sync() requested to sync only 1 byte from the page
    being synced.
  - TC_LOG_MMAP::sync() broadcasted syncing->cond too early.
  - TC_LOG_MMAP::sync() could dereference NULL active.
  - TC_LOG_MMAP::unlog() performed page writes without the page lock
  - Do not assert but return error in the case the opened log was
    shorter than three pages long in TC_LOG_MMAP::open().
  - If TC_LOG_MMAP::get_active_from_pool() chooses the last pool page
    to be made active, it was not unlinked from the pool.

- backport of the tc_log_mmap unit test from MySQL 5.7.2 with a
  supporting TC_LOG_MMAP::size() method.

516. By Laurynas Biveinis

Null-merge lp:percona-server/5.5 revision 607

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