Forum: Ruby-core [ruby-trunk - Bug #7985][Open] Kidsruby crashes on Ubuntu thin client

Issue #7985 has been reported by dbclin (David Clinton).

----------------------------------------
Bug #7985: Kidsruby crashes on Ubuntu thin client
https://bugs.ruby-lang.org/issues/7985

Author: dbclin (David Clinton)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:
ruby -v: /usr/local/kidsruby/app/models/runner.rb:23:in 
`method_missing': undefined method `warning' for Qt::MessageBox:Class 
(NoMethodError)   from /usr/local/kidsruby/app/models/runner.rb:23:in 
`save_kid_code'   from /usr/local/kidsruby/app/models/runner.rb:12:in 
`run'   from /usr/local/kidsruby/app/widgets/main.rb:96:in 
`evaluateRuby'   from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`qt_metacall'   from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`method_missing'   from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`exec'   from /usr/local/kidsruby/main.rb:18:in `<main>' 
/usr/local/kidsruby/main.rb: [BUG] Segmentation fault ruby 1.9.2p320 
(2012-04-20 revision 35421) [i686-linux]  -- control frame ---------- 
c:0001 p:0000 s:0002 b:0002 l:00077c d:00077c TOP 
---------------------------  -- C level backtrace information 
---------------------------------
 ---------- 
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(rb_vm_bugreport+0x72) 
[0xb7765242] /usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x567b7) 
[0xb763d7b7] /usr/local/kidsruby/ruby/lib/libruby.so.1.9(rb_bug+0x3a) 
[0xb763d8aa] /usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x10a5e4) 
[0xb76f15e4] [0xb77da40c] 
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZNK12QFontPrivate15engineForScriptEi+0x70) 
[0xb6628830] 
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZNK12QFontMetrics6ascentEv+0x27) 
[0xb6640917] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x717a71) 
[0xb3fcba71] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5d8d60) 
[0xb3e8cd60] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x7177b4) 
[0xb3fcb7b4] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x7178c6) 
[0xb3fcb8c6] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5ce0d0) 
[0xb3e820d0] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b4a
 5f) [0xb3f68a5f] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b5b03) 
[0xb3f69b03] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b424e) 
[0xb3f6824e] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x642fb0) 
[0xb3ef6fb0] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x643438) 
[0xb3ef7438] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65153b) 
[0xb3f0553b] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6687af) 
[0xb3f1c7af] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x668d4e) 
[0xb3f1cd4e] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65153b) 
[0xb3f0553b] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x657b3b) 
[0xb3f0bb3b] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65b5b4) 
[0xb3f0f5b4] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x66d46c) 
[0xb3f2146c] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38]
 /usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x64f823) 
[0xb3f03823] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6469e1) 
[0xb3efa9e1] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x645ee8) 
[0xb3ef9ee8] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x646871) 
[0xb3efa871] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6c8f47) 
[0xb3f7cf47] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5ab053) 
[0xb3e5f053] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5a5b91) 
[0xb3e59b91] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x60df31) 
[0xb3ec1f31] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x60df92) 
[0xb3ec1f92] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x722bfb) 
[0xb3fd6bfb] /usr/local/kidsru
 by/vendor/dependencies/libQtCore.so.4(_ZN14QObjectPrivate14deleteChildrenEv+0x6f) 
[0xb6ea027f] 
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN7QObjectD2Ev+0x39d) 
[0xb6ea730d] 
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN16QCoreApplicationD2Ev+0xba) 
[0xb6e929da] 
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZN12QApplicationD2Ev+0x466) 
[0xb63f1c26] 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libsmokeqtgui.so.3(_ZN12__smokeqtgui14x_QApplicationD0Ev+0x51) 
[0xb599f9f5] 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libsmokeqtgui.so.3(_ZN12__smokeqtgui18xcall_QApplicationEsPvPN5Smoke9StackItemE+0x8d1) 
[0xb598b558] 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libqtruby4shared.so.2(_Z14smokeruby_freePv+0x7de) 
[0xb50fc6eb] /usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x6d1aa) 
[0xb76541aa] 
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(ruby_cleanup+0x1be) 
[0xb764163e] /usr/local/kid
 sruby/ruby/lib/libruby.so.1.9(ruby_run_node+0x3d) [0xb764187d] 
ruby(main+0x68) [0x80487e8] 
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0xb73b44d3] 
[NOTE] You may have encountered a bug in the Ruby interpreter or 
extension libraries. Bug reports are welcome. For details: 
http://www.ruby-lang.org/bugreport.html  /usr/bin/kidsruby: line 7: 
29589 Aborted                 (core dumped) ruby 
/usr/local/kidsruby/main.rb


I'm running Edubuntu 12.04. Kidsruby (ruby 1.9.2p320) runs fine on the 
server, but when it is run on a thin client (LTSP), and a simple program 
is invoked, it crashes. By simple program, I mean something like this:

Turtle.draw do
forward 50
end

kidsruby -v produced this output:
============
/usr/local/kidsruby/app/models/runner.rb:23:in `method_missing': 
undefined method `warning' for Qt::MessageBox:Class (NoMethodError)
  from /usr/local/kidsruby/app/models/runner.rb:23:in `save_kid_code'
  from /usr/local/kidsruby/app/models/runner.rb:12:in `run'
  from /usr/local/kidsruby/app/widgets/main.rb:96:in `evaluateRuby'
  from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`qt_metacall'
  from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`method_missing'
  from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`exec'
  from /usr/local/kidsruby/main.rb:18:in `<main>'
/usr/local/kidsruby/main.rb: [BUG] Segmentation fault
ruby 1.9.2p320 (2012-04-20 revision 35421) [i686-linux]

-- control frame ----------
c:0001 p:0000 s:0002 b:0002 l:00077c d:00077c TOP
---------------------------

-- C level backtrace information 
-------------------------------------------
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(rb_vm_bugreport+0x72) 
[0xb7765242]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x567b7) [0xb763d7b7]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(rb_bug+0x3a) [0xb763d8aa]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x10a5e4) [0xb76f15e4]
[0xb77da40c]
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZNK12QFontPrivate15engineForScriptEi+0x70) 
[0xb6628830]
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZNK12QFontMetrics6ascentEv+0x27) 
[0xb6640917]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x717a71) 
[0xb3fcba71]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5d8d60) 
[0xb3e8cd60]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x7177b4) 
[0xb3fcb7b4]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x7178c6) 
[0xb3fcb8c6]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5ce0d0) 
[0xb3e820d0]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b4a5f) 
[0xb3f68a5f]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b5b03) 
[0xb3f69b03]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b424e) 
[0xb3f6824e]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x642fb0) 
[0xb3ef6fb0]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x643438) 
[0xb3ef7438]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65153b) 
[0xb3f0553b]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6687af) 
[0xb3f1c7af]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x668d4e) 
[0xb3f1cd4e]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65153b) 
[0xb3f0553b]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x657b3b) 
[0xb3f0bb3b]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65b5b4) 
[0xb3f0f5b4]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x66d46c) 
[0xb3f2146c]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x64f823) 
[0xb3f03823]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6469e1) 
[0xb3efa9e1]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x645ee8) 
[0xb3ef9ee8]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x646871) 
[0xb3efa871]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6c8f47) 
[0xb3f7cf47]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5ab053) 
[0xb3e5f053]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5a5b91) 
[0xb3e59b91]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x60df31) 
[0xb3ec1f31]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x60df92) 
[0xb3ec1f92]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x722bfb) 
[0xb3fd6bfb]
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN14QObjectPrivate14deleteChildrenEv+0x6f) 
[0xb6ea027f]
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN7QObjectD2Ev+0x39d) 
[0xb6ea730d]
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN16QCoreApplicationD2Ev+0xba) 
[0xb6e929da]
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZN12QApplicationD2Ev+0x466) 
[0xb63f1c26]
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libsmokeqtgui.so.3(_ZN12__smokeqtgui14x_QApplicationD0Ev+0x51) 
[0xb599f9f5]
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libsmokeqtgui.so.3(_ZN12__smokeqtgui18xcall_QApplicationEsPvPN5Smoke9StackItemE+0x8d1) 
[0xb598b558]
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libqtruby4shared.so.2(_Z14smokeruby_freePv+0x7de) 
[0xb50fc6eb]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x6d1aa) [0xb76541aa]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(ruby_cleanup+0x1be) 
[0xb764163e]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(ruby_run_node+0x3d) 
[0xb764187d]
ruby(main+0x68) [0x80487e8]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0xb73b44d3]

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension 
libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

/usr/bin/kidsruby: line 7: 29589 Aborted                 (core dumped) 
ruby /usr/local/kidsruby/main.rb

Issue #7985 has been updated by drbrain (Eric Hodel).

ruby -v changed from /usr/local/kidsruby/app/models/runner.rb:23:in 
`method_missing': undefined method `warning' for Qt::MessageBox:Class 
(NoMethodError)   from /usr/local/kidsruby/app/models/runner.rb:23:in 
`save_kid_code'   from /usr/local/kidsruby/app/models/runner.rb:12:in 
`run'   from /usr/local/kidsruby/app/widgets/main.rb:96:in 
`evaluateRuby'   from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`qt_metacall'   from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`method_missing'   from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`exec'   from /usr/local/kidsruby/main.rb:18:in `<main>' 
/usr/local/kidsruby/main.rb: [BUG] Segmentation fault ruby 1.9.2p320 
(2012-04-20 revision 35421) [i686-linux]  -- control frame ---------- 
c:0001 p:0000 s:0002 b:0002 l:00077c d:00077c TOP 
---------------------------  -- C level backtrace information 
---------------------
 ---------------------- 
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(rb_vm_bugreport+0x72) 
[0xb7765242] /usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x567b7) 
[0xb763d7b7] /usr/local/kidsruby/ruby/lib/libruby.so.1.9(rb_bug+0x3a) 
[0xb763d8aa] /usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x10a5e4) 
[0xb76f15e4] [0xb77da40c] 
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZNK12QFontPrivate15engineForScriptEi+0x70) 
[0xb6628830] 
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZNK12QFontMetrics6ascentEv+0x27) 
[0xb6640917] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x717a71) 
[0xb3fcba71] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5d8d60) 
[0xb3e8cd60] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x7177b4) 
[0xb3fcb7b4] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x7178c6) 
[0xb3fcb8c6] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5ce0d0) 
[0xb3e820d0] /usr/local/kidsruby/vendor/dependencies/libQtWebKit.
 so.4(+0x6b4a5f) [0xb3f68a5f] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b5b03) 
[0xb3f69b03] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b424e) 
[0xb3f6824e] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x642fb0) 
[0xb3ef6fb0] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x643438) 
[0xb3ef7438] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65153b) 
[0xb3f0553b] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6687af) 
[0xb3f1c7af] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x668d4e) 
[0xb3f1cd4e] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65153b) 
[0xb3f0553b] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x657b3b) 
[0xb3f0bb3b] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65b5b4) 
[0xb3f0f5b4] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x66d46c) 
[0xb3f2146c] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) [
 0xb3ee9d38] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x64f823) 
[0xb3f03823] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6469e1) 
[0xb3efa9e1] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x645ee8) 
[0xb3ef9ee8] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x646871) 
[0xb3efa871] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6c8f47) 
[0xb3f7cf47] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5ab053) 
[0xb3e5f053] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5a5b91) 
[0xb3e59b91] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x60df31) 
[0xb3ec1f31] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x60df92) 
[0xb3ec1f92] 
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x722bfb) 
[0xb3fd6bfb] /usr/
 local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN14QObjectPrivate14deleteChildrenEv+0x6f) 
[0xb6ea027f] 
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN7QObjectD2Ev+0x39d) 
[0xb6ea730d] 
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN16QCoreApplicationD2Ev+0xba) 
[0xb6e929da] 
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZN12QApplicationD2Ev+0x466) 
[0xb63f1c26] 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libsmokeqtgui.so.3(_ZN12__smokeqtgui14x_QApplicationD0Ev+0x51) 
[0xb599f9f5] 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libsmokeqtgui.so.3(_ZN12__smokeqtgui18xcall_QApplicationEsPvPN5Smoke9StackItemE+0x8d1) 
[0xb598b558] 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libqtruby4shared.so.2(_Z14smokeruby_freePv+0x7de) 
[0xb50fc6eb] /usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x6d1aa) 
[0xb76541aa] 
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(ruby_cleanup+0x1be) 
[0xb764163e] /u
 sr/local/kidsruby/ruby/lib/libruby.so.1.9(ruby_run_node+0x3d) 
[0xb764187d] ruby(main+0x68) [0x80487e8] 
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0xb73b44d3] 
[NOTE] You may have encountered a bug in the Ruby interpreter or 
extension libraries. Bug reports are welcome. For details: 
http://www.ruby-lang.org/bugreport.html  /usr/bin/kidsruby: line 7: 
29589 Aborted                 (core dumped) ruby 
/usr/local/kidsruby/main.rb to -

Seems to be a QtGui font bug.
----------------------------------------
Bug #7985: Kidsruby crashes on Ubuntu thin client
https://bugs.ruby-lang.org/issues/7985#change-37196

Author: dbclin (David Clinton)
Status: Open
Priority: Normal
Assignee:
Category:
Target version:
ruby -v: -


I'm running Edubuntu 12.04. Kidsruby (ruby 1.9.2p320) runs fine on the 
server, but when it is run on a thin client (LTSP), and a simple program 
is invoked, it crashes. By simple program, I mean something like this:

Turtle.draw do
forward 50
end

kidsruby -v produced this output:
============
/usr/local/kidsruby/app/models/runner.rb:23:in `method_missing': 
undefined method `warning' for Qt::MessageBox:Class (NoMethodError)
  from /usr/local/kidsruby/app/models/runner.rb:23:in `save_kid_code'
  from /usr/local/kidsruby/app/models/runner.rb:12:in `run'
  from /usr/local/kidsruby/app/widgets/main.rb:96:in `evaluateRuby'
  from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`qt_metacall'
  from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`method_missing'
  from 
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/Qt/qtruby4.rb:469:in 
`exec'
  from /usr/local/kidsruby/main.rb:18:in `<main>'
/usr/local/kidsruby/main.rb: [BUG] Segmentation fault
ruby 1.9.2p320 (2012-04-20 revision 35421) [i686-linux]

-- control frame ----------
c:0001 p:0000 s:0002 b:0002 l:00077c d:00077c TOP
---------------------------

-- C level backtrace information 
-------------------------------------------
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(rb_vm_bugreport+0x72) 
[0xb7765242]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x567b7) [0xb763d7b7]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(rb_bug+0x3a) [0xb763d8aa]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x10a5e4) [0xb76f15e4]
[0xb77da40c]
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZNK12QFontPrivate15engineForScriptEi+0x70) 
[0xb6628830]
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZNK12QFontMetrics6ascentEv+0x27) 
[0xb6640917]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x717a71) 
[0xb3fcba71]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5d8d60) 
[0xb3e8cd60]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x7177b4) 
[0xb3fcb7b4]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x7178c6) 
[0xb3fcb8c6]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5ce0d0) 
[0xb3e820d0]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b4a5f) 
[0xb3f68a5f]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b5b03) 
[0xb3f69b03]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6b424e) 
[0xb3f6824e]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x642fb0) 
[0xb3ef6fb0]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x643438) 
[0xb3ef7438]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65153b) 
[0xb3f0553b]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6687af) 
[0xb3f1c7af]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x668d4e) 
[0xb3f1cd4e]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65153b) 
[0xb3f0553b]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x657b3b) 
[0xb3f0bb3b]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x65b5b4) 
[0xb3f0f5b4]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x66d46c) 
[0xb3f2146c]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x64f823) 
[0xb3f03823]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6469e1) 
[0xb3efa9e1]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x645ee8) 
[0xb3ef9ee8]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x646871) 
[0xb3efa871]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x635d38) 
[0xb3ee9d38]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x6c8f47) 
[0xb3f7cf47]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5ab053) 
[0xb3e5f053]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x5a5b91) 
[0xb3e59b91]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x60df31) 
[0xb3ec1f31]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x60df92) 
[0xb3ec1f92]
/usr/local/kidsruby/vendor/dependencies/libQtWebKit.so.4(+0x722bfb) 
[0xb3fd6bfb]
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN14QObjectPrivate14deleteChildrenEv+0x6f) 
[0xb6ea027f]
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN7QObjectD2Ev+0x39d) 
[0xb6ea730d]
/usr/local/kidsruby/vendor/dependencies/libQtCore.so.4(_ZN16QCoreApplicationD2Ev+0xba) 
[0xb6e929da]
/usr/local/kidsruby/vendor/dependencies/libQtGui.so.4(_ZN12QApplicationD2Ev+0x466) 
[0xb63f1c26]
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libsmokeqtgui.so.3(_ZN12__smokeqtgui14x_QApplicationD0Ev+0x51) 
[0xb599f9f5]
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libsmokeqtgui.so.3(_ZN12__smokeqtgui18xcall_QApplicationEsPvPN5Smoke9StackItemE+0x8d1) 
[0xb598b558]
/usr/local/kidsruby/vendor/ruby/1.9.1/gems/qtbindings-4.6.3.4/lib/1.9/libqtruby4shared.so.2(_Z14smokeruby_freePv+0x7de) 
[0xb50fc6eb]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(+0x6d1aa) [0xb76541aa]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(ruby_cleanup+0x1be) 
[0xb764163e]
/usr/local/kidsruby/ruby/lib/libruby.so.1.9(ruby_run_node+0x3d) 
[0xb764187d]
ruby(main+0x68) [0x80487e8]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0xb73b44d3]

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension 
libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

/usr/bin/kidsruby: line 7: 29589 Aborted                 (core dumped) 
ruby /usr/local/kidsruby/main.rb