The symptoms appear to be similar, there is a race condition between a user thread doing BP page relocation and at the same time the master thread attempting to flush the page as part of a bigger batch.

The interesting threads are these:

Thread 1 (Thread 0x7ec739c9a700 (LWP 42350)):
...
#5  0x00000000008a6506 in buf_page_get_space (bpage=0x7ee75cabb450, flush_type=BUF_FLUSH_LIST, n_to_flush=300, count=0x7ec739c99568) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/include/buf0buf.ic:749
#6  buf_flush_page_and_try_neighbors (bpage=0x7ee75cabb450, flush_type=BUF_FLUSH_LIST, n_to_flush=300, count=0x7ec739c99568) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0flu.c:1634
#7  0x00000000008a69fe in buf_flush_flush_list_batch (buf_pool=0x2817898, flush_type=<value optimized out>, min_n=300, lsn_limit=18446744073709551615) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0flu.c:1772
#8  buf_flush_batch (buf_pool=0x2817898, flush_type=<value optimized out>, min_n=300, lsn_limit=18446744073709551615) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0flu.c:1854
#9  0x00000000008a6ca0 in buf_flush_list (min_n=300, lsn_limit=18446744073709551615) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0flu.c:2071
#10 0x000000000084c3bd in srv_master_thread (arg=<value optimized out>) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/srv/srv0srv.c:3879


Thread 22 (Thread 0x7ec67baeb700 (LWP 10836)):
...
#6  buf_flush_relocate_on_flush_list (bpage=0x7ee75cabb450, dpage=0x7eb09bd94a20) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0flu.c:613
#7  0x00000000008ab020 in buf_LRU_free_block (bpage=0x7ee75cabb450, zip=0, have_LRU_mutex=1) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0lru.c:2034
#8  0x00000000008ac217 in buf_LRU_free_from_unzip_LRU_list (buf_pool=0x2817898, n_iterations=1) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0lru.c:981
#9  buf_LRU_search_and_free_block (buf_pool=0x2817898, n_iterations=1) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0lru.c:1085
#10 0x00000000008ac8ff in buf_LRU_get_free_block (buf_pool=0x2817898) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0lru.c:1326
#11 0x000000000089b74f in buf_page_get_gen (space=1256, zip_size=4096, offset=73393, rw_latch=3, guess=0x0, mode=10, file=0xa6ad00 "/mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/btr/btr0cur.c", line=3615, mt
r=0x7ec67bae41f0) at /mnt/workspace/percona-server-5.5-binaries/label_exp/centos5-64/Percona-Server-5.5.34-rel32.0/storage/innobase/buf/buf0buf.c:2667