Agent/heap_dump problems #1933

hosiawak opened this Issue Sep 28, 2012 · 1 comment


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3 participants


I can't make agent/heap dump work at all for some reason, various issues (current master):

  • On OS X Mountain Lion:

    ./bin/rbx -Xagent.start

(in another terminal):

./bin/rbx console

won't connect, just hangs

  • On Ubuntu 12.04 I can connect to the agent but when I run:

    set system.memory.dump heap.dump

I can't read the heap.dump file using (according to instructions on ), I get:

An exception occurred running /root/heap_dump/bin/histo.rb
undefined method `as_module' on nil:NilClass. (NoMethodError)

Kernel(NilClass)#as_module (method_missing) at kernel/delta/kernel.rb:81
Rubinius::HeapDump::DumpedObject#direct_class_object at /root/heap_dump/lib/heap_dump/dumped_object.rb:51
Rubinius::HeapDump::DumpedObject#class_object at /root/heap_dump/lib/heap_dump/dumped_object.rb:66
{ } in Rubinius::HeapDump::Histogram.by_class at /root/heap_dump/lib/heap_dump/histogram.rb:37
Array#each at kernel/bootstrap/array.rb:68
Rubinius::HeapDump::Histogram.by_class at /root/heap_dump/lib/heap_dump/histogram.rb:37
Rubinius::HeapDump::Objects#histogram at /root/heap_dump/lib/heap_dump/objects.rb:13
Object#script at /root/heap_dump/bin/histo.rb:21
Rubinius::CodeLoader#load_script at kernel/delta/codeloader.rb:68
Rubinius::CodeLoader.load_script at kernel/delta/codeloader.rb:110
Rubinius::Loader#script at kernel/loader.rb:614
Rubinius::Loader#main at kernel/loader.rb:817

  • The heap.dump file is not always created, it is created always only when I start just rbx without loading any gems. It isn't created if I load Chef and lots of other things and run chef-client (I'll try to provide a repro)

Can anyone else confirm any of the above please ?


@dbussink dbussink added a commit that referenced this issue Oct 2, 2012
@dbussink dbussink Trigger a wakeup after setting up the listening socket for the agent
This fixes the problem on OS X where opening an agent console would just
hang. Related to #1933.
blewa commented Oct 14, 2012

I'm also running into this with both rubinius 2.0.0dev (1.8.7 78652b5 yyyy-mm-dd JI) and rubinius 1.2.4 (1.8.7 release 2011-07-05 JI) in Ubuntu 12.04 when trying to run the analysis. I'm able to take dumps without issue in 2.0.0dev in Ruby 1.9 mode.

@dbussink dbussink added a commit that closed this issue Oct 23, 2012
@dbussink dbussink Fix initialization ordering in ontology
Encoding needs a lot of the infrastructure in place to initialize. One
important thing is that it needs structures such as CompactLookupTable
for instance variables ready. Before Encoding was initialized before
this, resulting in a CompactLookupTable that had 0x22 as it's class

This was exposed when doing a heap dump, which then crashed because it
couldn't find any class for that invalid 0x22 pointer value. Reordering
in the ontology makes sure we setup stuff in the right order.

Fixes #1933
@dbussink dbussink closed this in 9288335 Oct 23, 2012
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