# Help debugging Trace/BPT trap on MacOSx 5.6.1

**URL:** <https://www.ruby-forum.com/t/help-debugging-trace-bpt-trap-on-macosx-5-6-1/175375>\
**Category:** Rails\
**Created:** [September 11, 2009, 10:53pm UTC](https://www.ruby-forum.com/t/help-debugging-trace-bpt-trap-on-macosx-5-6-1/175375 "2009-09-11T22:53:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![hknaksu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/b782af/32.png) [@hknaksu](https://www.ruby-forum.com/u/hknaksu)\
**Post date:** [September 11, 2009, 10:53pm UTC](https://www.ruby-forum.com/t/help-debugging-trace-bpt-trap-on-macosx-5-6-1/175375/1 "2009-09-11T22:53:40Z")

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Hi All,

We are trying to run our app with latest ruby 1.9.1-p243 and rails  
v2.3.4 but when we hit some of the controllers mongrel quits with  
“Trace/BPT trap” error, same thing happens with webrick. There are no  
additional logs! We have all the latest gems and plugins installed.

I would like to debug and see what causing this this but I wasn’t very  
successful. Can you point me to some tools that I can use? I am toying  
with Dtrace but haven’t figure it out yet.

thanks,  
–Hakan