The feature branch sources were copied to  lp:~laurynas-biveinis/percona-server/bug-1200788-repro if needed.

#6  0x0000000000d599d0 in trx_commit_in_memory (trx=0x7f5c6002e7a8, lsn=1954621) at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/trx/trx0trx.cc:1496
1496		ut_ad(trx_sys->descr_n_used <= UT_LIST_GET_LEN(trx_sys->rw_trx_list));
(gdb) print trx_sys->descr_n_used
$1 = 1
(gdb) print trx_sys->rw_trx_list
$2 = {count = 1, start = 0x7f5c700196f8, end = 0x7f5c700196f8}

(gdb) bt
#0  0x00007f5cb2056f2c in __pthread_kill (threadid=<optimized out>, signo=6) at ../nptl/sysdeps/unix/sysv/linux/pthread_kill.c:62
#1  0x0000000000adb1f5 in my_write_core (sig=6) at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/mysys/stacktrace.c:422
#2  0x0000000000736961 in handle_fatal_signal (sig=6) at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/sql/signal_handler.cc:251
#3  <signal handler called>
#4  0x00007f5cb149b037 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#5  0x00007f5cb149e698 in __GI_abort () at abort.c:90
#6  0x0000000000d599d0 in trx_commit_in_memory (trx=0x7f5c6002e7a8, lsn=1954621) at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/trx/trx0trx.cc:1496
#7  0x0000000000d59e73 in trx_commit_low (trx=0x7f5c6002e7a8, mtr=0x7f5ca1b4a630) at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/trx/trx0trx.cc:1566
#8  0x0000000000d59eff in trx_commit (trx=0x7f5c6002e7a8) at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/trx/trx0trx.cc:1589
#9  0x0000000000d5a7eb in trx_commit_for_mysql (trx=0x7f5c6002e7a8) at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/trx/trx0trx.cc:1815
#10 0x0000000000e0890f in dict_stats_exec_sql (pinfo=0x7f5c6002d328, sql=0x1130000 "ize,\n:stat_description\n);\nEND;")
    at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/dict/dict0stats.cc:298
#11 0x0000000000e0c1b8 in dict_stats_save_index_stat (index=0x7f5c6002da80, last_update=1380173996, stat_name=0x112eb07 "->magic_n == 375767", stat_value=1, sample_size=0x0, 
    stat_description=0x11303e0 "le statistics for table %s: %s\n") at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/dict/dict0stats.cc:2169
#12 0x0000000000e0c65c in dict_stats_save (table_orig=0x7f5c70081708) at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/dict/dict0stats.cc:2314
#13 0x0000000000e0dc3d in dict_stats_update (table=0x7f5c70081708, stats_upd_option=DICT_STATS_RECALC_PERSISTENT)
    at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/dict/dict0stats.cc:2949
#14 0x0000000000e10d02 in dict_stats_process_entry_from_recalc_pool () at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/dict/dict0stats_bg.cc:302
#15 0x0000000000e10de4 in dict_stats_thread (arg=0x0) at /home/laurynas/percona/src/xtradb-thread-priority-flag/Percona-Server/storage/innobase/dict/dict0stats_bg.cc:349
#16 0x00007f5cb2051f8e in start_thread (arg=0x7f5ca1b4c700) at pthread_create.c:311
#17 0x00007f5cb155de1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113