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456. By Laurynas Biveinis on 2013-10-04

Fix bug 1224432 (Buffer pool watch sentinel page buf_fix_count race
condition | InnoDB: Failing assertion: buf_fix_count > 0 in file
buf0buf.cc line 3690 | abort (sig=6) in buf_page_init_for_read).

The issue was that LRU list mutex was always released in one of the
code paths unconditionally, but the later watch_page state re-check
only happened if buf_buddy_alloc() had to release the LRU mutex in the
same code path too. Fix by setting the LRU list mutex release flag in
the affected code path unconditionally.

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