kmail crashed with SIGSEGV in QListData::begin() [on startup]

[Yiannis Belias]

Binary package hint: kdepim

Hi,
I'm testing Kubuntu Karmic alpha5 with latest packages.
I was having some strange kmail freezes where kmail was eating about 50% of both CPU cores.
I quit a couple times reopened and now it just crashed before even creating a window.
I have lots of mail ~2GB in maildir format.
Just tried to run kmail through gdb and it still crashes but I can't get a backtrace:
Starting program: /usr/bin/kmail
[Thread debugging using libthread_db enabled]
<unknown program name>(9394)/: Communication problem with "kmail" , it probably crashed.
Error message was: "org.freedesktop.DBus.Error.NoReply" : " "Message did not receive a reply (timeout by message bus)" "
Program exited with code 0377.
(gdb) bt
No stack.

ProblemType: Crash
Architecture: i386
Date: Sun Sep 13 22:35:32 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/kmail
Package: kmail 4:4.3.1-0ubuntu1
ProcCmdline: /usr/bin/kmail -caption KMail
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-10.30-generic
SegvAnalysis:
 Segfault happened at: 0xedfaf2 <_ZNK11KMFolderMgr12findIdStringERK7QStringjPK11KMFolderDir+34>: mov 0x18(%eax),%edx
 PC (0x00edfaf2) ok
 source "0x18(%eax)" (0x00000024) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: kdepim
StacktraceTop:
 QListData::begin (this=0x0, folderId=..., id=0, dir=0xc)
 QList<KMFolderNode*>::constBegin (this=0x0, folderId=..., id=0, dir=0xc)
 KMFolderMgr::findIdString (this=0x0, folderId=..., id=0, dir=0xc)
 KMKernel::findFolderById (this=0xbfdb03dc, idString=...)
 KMSearch::read (this=0x9c743d0, location=...)
Title: kmail crashed with SIGSEGV in QListData::begin()
Uname: Linux 2.6.31-10-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare users

[Yiannis Belias (jonnyb)]

Also tried to use valgrind:
valgrind --log-file=kmail.log kmail --nofork

[Yiannis Belias (jonnyb)]

Hi,
I think I discovered the offending file. It's: ~/.kde/share/apps/kmail/search/Important
When I delete it, kmail works fine. When I put it back, it crashes again.
I also tried to place this file on a fresh alpha5 install on my netbook, and kmail still crashes.
I'm attaching the whole search folder.

[Apport retracing service (apport)]

StacktraceTop:KMFolderMgr::find (this=0x0, folderName=@0xbfdafad4,
KMKernel::registerSystemTrayApplet (this=0xbfdb03dc,
KMFolderSearch::canAccess (this=0x9c743d0)
KMSearch (this=0x9a6c300, parent=0x9b782c0,
KMFolderSearch::expungeContents (this=0x9a6c300)

[Jonathan Thomas (echidnaman)]

Thanks for the very detailed bug report. I have forwarded your report on to the KMail developers. You can track this bug and correspond with the developers should they have any questions at http://bugs.kde.org/show_bug.cgi?id=207398