Crash/segfault in google::protobuf::internal::RepeatedPtrFieldBase::raw_data (this=0x20) at /usr/include/google/protobuf/repeated_field.h:611

Crash occurred while testing the transaction log.
Server built via
  ./configure --with-debug
Server started via
  ./test-run --start-and-exit --mysqld=--transaction-log.enable
Server tested via randgen command line:
perl ./gentest.pl --dsn=dbi:drizzle:host=localhost:port=9307:user=root:password="":database=test --gendata=conf/drizzle/drizzle.zz --grammar=conf/engines/engine_stress.yy --queries=1000 --threads=1 --debug

A fairly large number of queries occurred between defining SAVEPOINT A and trying to ROLLBACK to it (which caused the crash).

This might be related to:
https://bugs.launchpad.net/drizzle/+bug/626566

Backtrace:
Program terminated with signal 11, Segmentation fault.
#0 0x000000000084ba36 in google::protobuf::internal::RepeatedPtrFieldBase::raw_data (this=0x20)
    at /usr/include/google/protobuf/repeated_field.h:611
611 return elements_;
(gdb) backtrace
#0 0x000000000084ba36 in google::protobuf::internal::RepeatedPtrFieldBase::raw_data (this=0x20)
    at /usr/include/google/protobuf/repeated_field.h:611
#1 0x000000000084e1c2 in google::protobuf::RepeatedPtrField<drizzled::message::Statement>::begin (this=0x20)
    at /usr/include/google/protobuf/repeated_field.h:929
#2 0x0000000000848db9 in drizzled::TransactionServices::rollbackToSavepoint (this=0xe84990, session=0x25ef080, sv=...)
    at drizzled/transaction_services.cc:835
#3 0x00000000008210e0 in drizzled::statement::RollbackToSavepoint::execute (this=0x25e1d00)
    at drizzled/statement/rollback_to_savepoint.cc:76
#4 0x00000000007cc7ba in mysql_execute_command (session=0x25ef080) at drizzled/sql_parse.cc:479
#5 0x00000000007cd57c in drizzled::mysql_parse (session=0x25ef080, inBuf=0x2549a88 "ROLLBACK TO SAVEPOINT A", length=23)
    at drizzled/sql_parse.cc:750
#6 0x00000000007cc10e in drizzled::dispatch_command (command=drizzled::COM_QUERY, session=0x25ef080,
    packet=0x25891b1 "ROLLBACK TO SAVEPOINT A", packet_length=23) at drizzled/sql_parse.cc:224
#7 0x000000000078ef41 in drizzled::Session::executeStatement (this=0x25ef080) at drizzled/session.cc:667
#8 0x000000000078e7db in drizzled::Session::run (this=0x25ef080) at drizzled/session.cc:522
#9 0x00007f42c665bb54 in MultiThreadScheduler::runSession (this=0x231b3b0, session=0x25ef080)
    at ./plugin/multi_thread/multi_thread.h:67
#10 0x00007f42c66599e2 in session_thread (arg=0x25ef080) at plugin/multi_thread/multi_thread.cc:52
#11 0x00007f42ca33b9ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#12 0x00007f42ca0986fd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()