yob/pdf-preflight — Issue #4: SystemStackError on MinPpi rule
Author: tomtaylor
Created: 2012-01-21 14:39:44+00:00
State: open

This looks like a separate issue to #3, but again on the MinPpi rule. It exhibits using [this sample PDF](http://files.newspaperclub.com.s3.amazonaws.com/tmp/11235.pdf). On Ruby 1.9.2 + REE 1.8.7 it appears to hang in a tight loop, using full CPU.

I've not managed to exhibit this in my test code, but my production logs indicate that this eventually throws a SystemStackError with the following stack trace:

/usr/lib/ruby/1.8/yaml/rubytypes.rb:369:in `to_yaml'
/usr/lib/ruby/1.8/yaml.rb:391:in `call'
/usr/lib/ruby/1.8/yaml.rb:391:in `emit'
/usr/lib/ruby/1.8/yaml.rb:391:in `quick_emit'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:368:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:110:in `node_export'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:110:in `add'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:110:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:109:in `each'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:109:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:108:in `seq'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:108:in `to_yaml'
/usr/lib/ruby/1.8/yaml.rb:391:in `call'
/usr/lib/ruby/1.8/yaml.rb:391:in `emit'
/usr/lib/ruby/1.8/yaml.rb:391:in `quick_emit'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:107:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:110:in `node_export'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:110:in `add'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:110:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:109:in `each'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:109:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:108:in `seq'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:108:in `to_yaml'
/usr/lib/ruby/1.8/yaml.rb:391:in `call'
/usr/lib/ruby/1.8/yaml.rb:391:in `emit'
/usr/lib/ruby/1.8/yaml.rb:391:in `quick_emit'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:107:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:18:in `node_export'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:18:in `add'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:18:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:17:in `each'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:17:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:16:in `map'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:16:in `to_yaml'
/usr/lib/ruby/1.8/yaml.rb:391:in `call'
/usr/lib/ruby/1.8/yaml.rb:391:in `emit'
/usr/lib/ruby/1.8/yaml.rb:391:in `quick_emit'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:15:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:41:in `node_export'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:41:in `add'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:41:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:40:in `each'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:40:in `to_yaml'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:39:in `map'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:39:in `to_yaml'
/usr/lib/ruby/1.8/yaml.rb:391:in `call'
/usr/lib/ruby/1.8/yaml.rb:391:in `emit'
/usr/lib/ruby/1.8/yaml.rb:391:in `quick_emit'
/usr/lib/ruby/1.8/yaml/rubytypes.rb:38:in `to_yaml'
/usr/lib/ruby/1.8/yaml.rb:117:in `dump'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:194:in `clone_state'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:47:in `save_graphics_state'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:85:in `invoke_xobject'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `send'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:62:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `each'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:61:in `callback'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:73:in `content_stream'
/srv/npc/shared/bundle/ruby/1.8/gems/pdf-reader-1.0.0.rc1/lib/pdf/reader/form_xobject.rb:42:in `walk'
/srv/npc/shared/bundle/ruby/1.8/bundler/gems/pdf-preflight-1a68510ac9af/lib/preflight/rules/min_ppi.rb:105:in `invoke_form_xobject'
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