Segmentation fault in libpq

Hi all,

we've developed an application using libpq to access a table in the
PgSQL database but we're sometimes experiencing segmentation fault on
resetPQExpBuffer() function of libpq called from PQexecParams() with
prepared query.

PostgreSQL version is 9.6.3 and the backtrace is:

Core was generated by `/usr/ti/bin/status-monitor2 -m /usr/lib64/status-monitor2/modules'.
Program terminated with signal 11, Segmentation fault.
#0 resetPQExpBuffer (str=str(at)entry=0x9f4a28) at pqexpbuffer.c:152
152 str->data[0] = '\0';

Thread 1 (Thread 0x7fdf68de3840 (LWP 3525)):
#0 resetPQExpBuffer (str=str(at)entry=0x9f4a28) at pqexpbuffer.c:152
No locals.
#1 0x00007fdf66e0333d in PQsendQueryStart (conn=conn(at)entry=0x9f46d0) at fe-exec.c:1371
No locals.
#2 0x00007fdf66e044b9 in PQsendQueryParams (conn=conn(at)entry=0x9f46d0, command=command(at)entry=0x409a98"SELECT min, hour, day, month, dow, sensor, module, params, priority,
rt_due FROM sm.cron WHERE sensor = $1 ORDER BY priority DESC", nParams=nParams(at)entry=1, paramTypes=paramTypes(at)entry=0x0, paramValues=paramValues(at)entry=0xa2b7b0, paramLengths=paramLengths(at)entry=0x0, paramFormats=paramFormats(at)entry=0x0, resultFormat=resultFormat(at)entry=0) at fe-exec.c:1192
No locals.
#3 0x00007fdf66e0552b in PQexecParams (conn=0x9f46d0, command=0x409a98"SELECT min, hour, day, month, dow, sensor, module, params, priority,
rt_due FROM sm.cron WHERE sensor = $1 ORDER BY priority DESC", nParams=1, paramTypes=0x0, paramValues=0xa2b7b0, paramLengths=0x0, paramFormats=0x0, resultFormat=0) at fe-exec.c:1871
No locals.

Unfortunately we didn't have more information from the crash, at least
for now.

Is this a known issue and can you help me with this one?

Thanks,
Michal

--
Michal Novotny
System Development Lead
michal(dot)novotny(at)greycortex(dot)com

GREYCORTEX s.r.o.
Purkynova 127, 61200 Brno
Czech Republic
www.greycortex.com