Failing assertion: bpage->in_flush_list in file buf0flu.c line 502 | Valgrind: Conditional jump or move depends on uninitialised value(s) at buf_flush_page_and_try_neighbors , buf_flush_ready_for_flush , mutex_validate , mutex_own | abort in buf_flush_ready_for_flush (sig6)

Thread 5 (LWP 11012):
+bt
#0 0x000000340cc0c69c in pthread_kill () from /lib64/libpthread.so.0
#1 0x0000000000808599 in my_write_core (sig=6) at /bzr/5.5_val/Percona-Server-5.5.32-rel31.0/mysys/stacktrace.c:433
#2 0x00000000006bd1b5 in handle_fatal_signal (sig=6) at /bzr/5.5_val/Percona-Server-5.5.32-rel31.0/sql/signal_handler.cc:250
#3 <signal handler called>
#4 0x000000340c4328a5 in raise () from /lib64/libc.so.6
#5 0x000000340c434085 in abort () from /lib64/libc.so.6
#6 0x0000000000900937 in buf_flush_ready_for_flush (bpage=0x4c6bc30, flush_type=BUF_FLUSH_LIST) at /bzr/5.5_val/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0flu.c:502
#7 0x00000000009025a1 in buf_flush_page_and_try_neighbors (bpage=0x4c6bc30, flush_type=BUF_FLUSH_LIST, n_to_flush=4, count=0x192c4618) at /bzr/5.5_val/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0flu.c:1602
#8 0x000000000090371c in buf_flush_flush_list_batch (lsn_limit=953192905, min_n=4, buf_pool=0x5fcaf28) at /bzr/5.5_val/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0flu.c:1755
#9 buf_flush_batch (buf_pool=0x5fcaf28, flush_type=BUF_FLUSH_LIST, min_n=4, lsn_limit=953192905) at /bzr/5.5_val/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0flu.c:1845
#10 0x000000000090388c in buf_flush_list (min_n=4, lsn_limit=953192905) at /bzr/5.5_val/Percona-Server-5.5.32-rel31.0/storage/innobase/buf/buf0flu.c:2062
#11 0x00000000008954e4 in srv_master_thread (arg=<optimized out>) at /bzr/5.5_val/Percona-Server-5.5.32-rel31.0/storage/innobase/srv/srv0srv.c:3620
#12 0x000000340cc07851 in start_thread () from /lib64/libpthread.so.0
#13 0x000000340c4e890d in clone () from /lib64/libc.so.6

==10984== Thread 16:
==10984== Conditional jump or move depends on uninitialised value(s)
==10984== at 0x9024E5: buf_flush_page_and_try_neighbors (buf0buf.ic:78)
==10984== by 0x90371B: buf_flush_batch (buf0flu.c:1755)
==10984== by 0x90388B: buf_flush_list (buf0flu.c:2062)
==10984== by 0x8954E3: srv_master_thread (srv0srv.c:3620)
==10984== by 0x340CC07850: start_thread (in /lib64/libpthread-2.12.so)
==10984== by 0x340C4E890C: clone (in /lib64/libc-2.12.so)
[...etc...] - see attach

130726 19:07:57 InnoDB: Assertion failure in thread 422336256 in file buf0flu.c line 502
InnoDB: Failing assertion: bpage->in_flush_list
[...no crashing query....]