Segfault under Debian 6

[flack]

When running midcom's daily cron service, I get the following segfault under Debian 6 (and Ubuntu 12.10, but I didn't take a backtrace there):

Program received signal SIGSEGV, Segmentation fault.
0xb56b7d56 in midgard_query_builder_new (mgd=0x978840, classname=0x5f16f0 "nt_hierarchyNode")
    at src/query_builder.c:121
121     while(tables[i] != NULL) {  
(gdb) backtrace
#0  0xb56b7d56 in midgard_query_builder_new (mgd=0x978840, classname=0x5f16f0 "nt_hierarchyNode")
    at src/query_builder.c:121
#1  0xb572fa07 in zim_midgard_query_builder___construct (ht=1, return_value=0xe7ecdc, 
    return_value_ptr=0x0, this_ptr=0xe7eed4, return_value_used=0)
    at /var/repos/midgard-php5/query_builder.c:72
#2  0xb7907f9a in ?? () from /usr/lib/apache2/modules/libphp5.so
#3  0xb78de84e in execute () from /usr/lib/apache2/modules/libphp5.so
#4  0xb78b45a6 in zend_execute_scripts () from /usr/lib/apache2/modules/libphp5.so
#5  0xb7858704 in php_execute_script () from /usr/lib/apache2/modules/libphp5.so
#6  0xb794721b in ?? () from /usr/lib/apache2/modules/libphp5.so
#7  0x001487e1 in ap_run_handler ()
#8  0x0014c5e6 in ap_invoke_handler ()
#9  0x0015bdb4 in ap_internal_redirect ()
#10 0xb6f6f7fd in ?? () from /usr/lib/apache2/modules/mod_rewrite.so
#11 0x001487e1 in ap_run_handler ()
#12 0x0014c5e6 in ap_invoke_handler ()
#13 0x0015bf68 in ap_process_request ()
#14 0x00158a88 in ?? ()
#15 0x00151061 in ap_run_process_connection ()
#16 0x00161e0c in ?? ()
#17 0x00162121 in ?? ()
#18 0x001628af in ap_mpm_run ()
#19 0x00132f8a in main ()

I'm guessing the reason must be some missing tables, but I ran create/update_storage a number of times without any effect. Where did I go wrong?

[piotras]

QueryBuilder is depreciated. For modern types, you QuerySelect. Keep in mind that new type might be interface, mixin or abstract class. No one tweaked QB for such types.

[flack]

The problem is that I simply iterate over a list of classes from the midgard2 extension. I test isSubclassOf('midgard_object'), but apparently, I need something else. Is there a way to test what works with qb?

[piotras]

Please take a look at this code snippet:
https://github.com/piotras/raki/blob/master/RagnaroekPHPCR/src/Ragnaroek/PHPCR/WorkspaceManager.php#L31

[flack]

I just tried to copy that code, but I get

Fatal error: Class 'MidgardObjectReflector' not found

AFAICT, I should be on gjallarhorn HEAD, was this class maybe renamed at some point?

[piotras]

Ah... My fault. It's MidgardReflectorObject obviously.

[flack]

OK, I got it working now. Apart from the checks mentioned above, I also had to check for has_metadata_class, since adding a metadata.deleted constraint on a qb for a class without metadata leads to a segfault as well. I would be nice if there could be a warning instead, so that debugging is easier