Bug #6291

Backtrace printout halts for an extremely long time when large amounts of data are allocated

Added by Christoffer Lervag about 2 years ago. Updated almost 2 years ago.

Assignee:Yukihiro Matsumoto
Target version:1.9.3
ruby -v:1.9.3 Backport:


When large amounts of data are allocated, it can take an eternity for the backtrace printout to complete. Here's a simple example:

class SomeClass
  def initialize
    @a = Array.new(100000, "just some random string")
h = Hash.new
200.times {|i| h[i] = SomeClass.new}

This will halt with the following printout:

And then, after a very long time (depending on how much data is in memory), it will eventually finish:
test.rb:9: undefined method `asdf' for #Hash:0x1001bc348 (NoMethodError)

For me, this has caused a lot of frustration when running a test suite on an application which loads a lot of data in memory, as in many cases I will never get to see the actual backtrace. This makes debugging much more difficult. Perhaps there is some fundamental property of the Ruby language itself that makes this an 'expected behaviour', but if not, I would really appreciate to see this adressed.


#1 Updated by Yusuke Endoh about 2 years ago


I have no idea except adding a length limitation or timeout to #inspect.
Any other ideas?

Yusuke Endoh mame@tsg.ne.jp

#2 Updated by Yusuke Endoh about 2 years ago

  • Status changed from Open to Assigned
  • Assignee set to Yukihiro Matsumoto


Do you think that #inspect has a length limitation or timeout?

Yusuke Endoh mame@tsg.ne.jp

#3 Updated by Yukihiro Matsumoto almost 2 years ago

  • Status changed from Assigned to Closed

This one is not easy to fix.
We try to address it by improving #inspect, but we cannot make promise.


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