designer-qt4 crashed with SIGSEGV in KLocale::codecForEncoding()

[Andrew Clunis]

Starting designer-qt4 results in an immediate segfault, apparently a null dereference to do with locales.

Occurs on two separate Ubuntu 10.10 x86_64 machines. Always reproducible.

ProblemType: Crash
DistroRelease: Ubuntu 10.10
Package: qt4-designer 4:4.7.0-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
Architecture: amd64
CrashCounter: 1
Date: Sun Oct 17 00:17:18 2010
ExecutablePath: /usr/bin/designer-qt4
ProcCmdline: designer-qt4
ProcEnviron:
 PATH=(custom, user)
 SHELL=/bin/zsh
 LANG=en_CA.UTF-8
SegvAnalysis:
 Segfault happened at: 0x7f154680e6b0 <_ZNK7KLocale16codecForEncodingEv>: mov 0x8(%rdi),%rax
 PC (0x7f154680e6b0) ok
 source "0x8(%rdi)" (0x00000008) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: qt4-x11
StacktraceTop:
 KLocale::codecForEncoding() const () from /usr/lib/libkdecore.so.5
 ?? () from /usr/lib/liboktetacore.so.4
 Okteta::CharCodec::createCodec(Okteta::CharCoding) () from /usr/lib/liboktetacore.so.4
 ?? () from /usr/lib/liboktetagui.so.4
 Okteta::ByteArrayColumnView::ByteArrayColumnView(QWidget*) () from /usr/lib/liboktetagui.so.4
Title: designer-qt4 crashed with SIGSEGV in KLocale::codecForEncoding()
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[Jonathan Thomas (echidnaman)]

Are you designing something with an Okteta widget? (KDE's hex editor) It looks to be that the crash is coming from libokteta.

[Andrew Clunis (orospakr)]

Nope, this happens immediately on start. The Qt Designer UI is never even displayed.

[Jeremy Bícha (jbicha)]

I think I have the same issue as Andrew. After uninstalling Okteta, I am able to run Qt Designer.

[Andrew Clunis (orospakr)]

Sure enough, I do have Okteta installed. And sure enough, uninstalling it enables Designer to work again.

I should have looked at the backtrace more closely. :)

[Jonathan Thomas (echidnaman)]

Shifting over to Okteta's source package.

[byo (byo-spoon)]

I managed to make designer work again by just disabling okteta's designer plugin:

  cd /usr/lib/kde4/plugins/designer/
  sudo mv oktetadesignerplugin.so oktetadesignerplugin.so_

[NanoWar (nanowar)]

Removing Okteta solves this for me, too.

[Jonathan Thomas (echidnaman)]

This was fixed in KDE 4.6.