On 5/3/2012 12:25 AM, John Morris wrote: > Yep! I discovered the 'record' feature in gdb. Start up gdb on > rtapi_app, then run the following: > > start load threads name1=fast period1=50000 > record > c
I haven't been able to get the record feature of gdb to do much of anything useful, because it keeps stopping on an unsupported instruction (0xc5). I don't know if this is related to the crashing or not. :-/ I was, however, able to turn up what might be a useful clue using electric fence. I used the .gdbinit example from the debian package, which sets two environment variables prior to running rtapi_app: set environment EF_PROTECT_BELOW 1 set environment LD_PRELOAD /usr/lib/libefence.so.0.0 When run this way, the application *ALWAYS* segfaults on line 131 of linux_rtapi.c: the call to rtapi_print_msg call in the rtapi_reset_pagefault_count function (although it is the vfprintf in default_rtapi_msg_handler that is actually causing the segfault). I still don't know _why_ this is happening, but it feels like at least the root issue may be getting closer to the surface. -- Charles Steinkuehler char...@steinkuehler.net ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
