I narrowed it down.

 

The table causing the problem was created as “create table as select from <SOME_VIEW>”.

The view had one column that was always null and unknown type.

As a result in the table the column had type ANY. That seems to have caused the problem.

 

After I’ve created the table explicitly specifying all the types the problem has gone.

The segfault still needs fixing at some level.

 

Regards,

Alex Shestakov.

 

 

Hi,

 

I have a segmentation fault when running an SQL query against a specific table.

I can execute queries like

“select count(*) from <TABLE>”

but the server crashes when I do

“select * from <TABLE> where businessdate = ‘2013-12-18’ limit 100”.

 

MonetDB version:

MonetDB Database Server Toolkit v1.1 (Feb2013-SP5)

 

Stack trace:

#0  0x00007f7cf2987eb1 in GDKfilepath (path=0x7f6e44f0db5d "", dir=0x7f7ceb4c51d4 "bat", name=0x0, ext=0x0) at gdk_storage.c:51

#1  0x00007f7ceb3fbbd3 in BATlocation (fnme=0x7f6e44f0fbe0, bid=<value optimized out>) at sql_optimizer.c:77

#2  0x00007f7ceb3fc59a in SQLgetStatistics (c=0x7f7cebed6308) at sql_optimizer.c:160

#3  addQueryToCache (c=0x7f7cebed6308) at sql_optimizer.c:295

#4  0x00007f7ceb3fb7ed in backend_dumpproc (be=0x7f6e3809d5f0, c=0x7f7cebed6308, cq=0x7f6e383d4090, s=0x7f6e3837bd20) at sql_gencode.c:2431

#5  0x00007f7ceb3e2067 in SQLparser (c=0x7f7cebed6308) at sql_scenario.c:1755

#6  0x00007f7cf2f35b63 in runPhase (c=0x7f7cebed6308) at mal_scenario.c:522

#7  runScenarioBody (c=0x7f7cebed6308) at mal_scenario.c:558

#8  0x00007f7cf2f35caf in runScenario (c=0x7f7cebed6308) at mal_scenario.c:586

#9  0x00007f7cf2f36508 in MSserveClient (dummy=0x7f7cebed6308) at mal_session.c:446

#10 0x0000003ee9a07851 in start_thread () from /lib64/libpthread.so.0

#11 0x0000003ee92e890d in clone () from /lib64/libc.so.6

 

The problem is that it tries to de-reference null pointer ‘name’.

The pointer is calculated in BATLocation as  (b->T->heap.filename ? b->T->heap.filename: b->H->heap.filename).

The column in question has type real so as far as I understand there is no heap file for it.

I don’t know if heap.filename should contain NULL or something else.

 

Regards,

Alex Shestakov.

 

 

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