Customer report ExeMgr crash, system recovered and continue working. Memory usage was shown to be normal from the customer. No logs reporting memory usage problems.

from crash

Program terminated with signal 11, Segmentation fault.
#0 0x00007f0985a455bf in __memcpy_ssse3_back () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install mariadb-columnstore-platform-1.2.3-1.x86_64
(gdb) bt
#0 0x00007f0985a455bf in __memcpy_ssse3_back () from /lib64/libc.so.6
#1 0x00007f09884af126 in memcpy (__len=251805234, __src=0x7f056b41a040, __dest=<optimized out>) at /usr/include/bits/string3.h:51
#2 messageqcpp::ByteStream::append (this=this@entry=0x7f055ebfe090, bp=0x7f056b41a040 "", len=len@entry=251805234) at /data/buildbot/bb-worker/centos7/mariadb-columnstore-engine/utils/messageqcpp/bytestream.cpp:475
#3 0x00007f098aba412e in rowgroup::RGData::serialize (this=0x7f0715702940, bs=..., amount=251805234) at /data/buildbot/bb-worker/centos7/mariadb-columnstore-engine/utils/rowgroup/rowgroup.cpp:426
#4 0x00007f098aba5307 in rowgroup::RowGroup::serializeRGData (this=this@entry=0x7f056e1074d8, bs=...) at /data/buildbot/bb-worker/centos7/mariadb-columnstore-engine/utils/rowgroup/rowgroup.cpp:1380
#5 0x00007f098b7b7e05 in joblist::TupleAnnexStep::nextBand (this=0x7f056e107000, bs=...) at /data/buildbot/bb-worker/centos7/mariadb-columnstore-engine/dbcon/joblist/tupleannexstep.cpp:279
#6 0x00007f098b72875c in joblist::TupleJobList::projectTable (this=0x7f056e058180, bs=...) at /data/buildbot/bb-worker/centos7/mariadb-columnstore-engine/dbcon/joblist/joblist.cpp:378
#7 0x000055a9d609939b in (anonymous namespace)::SessionThread::operator() (this=<optimized out>) at /data/buildbot/bb-worker/centos7/mariadb-columnstore-engine/exemgr/main.cpp:954
#8 0x00007f098949deb4 in operator() (this=0x7f055a40cdd8) at /usr/include/boost/function/function_template.hpp:767
#9 threadpool::ThreadPool::beginThread (this=0x7ffe186160a0) at /data/buildbot/bb-worker/centos7/mariadb-columnstore-engine/utils/threadpool/threadpool.cpp:391
#10 0x00007f0987a1e27a in thread_proxy () from /lib64/libboost_thread-mt.so.1.53.0
#11 0x00007f0986f7edd5 in start_thread () from /lib64/libpthread.so.0
#12 0x00007f09859edead in clone () from /lib64/libc.so.6

from um1 log

Apr 22 10:17:36 usfit-scdb1 ProcessMonitor[112390]: 36.751600 |0|0|0| C 18 CAL0000: *****MariaDB ColumnStore Process Restarting: ExeMgr, old PID = 179302

from trace

Date/time: 2019-04-22 10:17:30
Signal: 11

[0x55a9d60a4b40]
/lib64/libpthread.so.0(+0xf5d0)[0x7f0986f865d0]
/lib64/libc.so.6(+0x1555bf)[0x7f0985a455bf]
/usr/local/mariadb/columnstore/lib/libmessageqcpp.so.1(_ZN11messageqcpp10ByteStream6appendEPKhj+0x56)[0x7f09884af126]
/usr/local/mariadb/columnstore/lib/librowgroup.so.1(_ZNK8rowgroup6RGData9serializeERN11messageqcpp10ByteStreamEj+0x3e)[0x7f098aba412e]
/usr/local/mariadb/columnstore/lib/libjoblist.so.1(_ZN7joblist14TupleAnnexStep8nextBandERN11messageqcpp10ByteStreamE+0xe5)[0x7f098b7b7e05]
/usr/local/mariadb/columnstore/lib/libjoblist.so.1(_ZN7joblist12TupleJobList12projectTableEiRN11messageqcpp10ByteStreamE+0x1c)[0x7f098b72875c]
[0x55a9d609939b]
/usr/local/mariadb/columnstore/lib/libthreadpool.so.1(_ZN10threadpool10ThreadPool11beginThreadEv+0x434)[0x7f098949deb4]
/lib64/libboost_thread-mt.so.1.53.0(+0xd27a)[0x7f0987a1e27a]
/lib64/libpthread.so.0(+0x7dd5)[0x7f0986f7edd5]
/lib64/libc.so.6(clone+0x6d)[0x7f09859edead]