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List:       kde-devel
Subject:    kdDebug stalls in arbitrary situations
From:       Frans Englich <frans.englich () telia ! com>
Date:       2005-04-28 22:54:21
Message-ID: 200504282302.40011.frans.englich () telia ! com
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Hello,

I've encountered a tricky bug: when a KDE C++ program was executed from a 
Python script(a test suite handler), it stalled on certain tests, which it 
did deterministically on repeated runs. However, when I ran the program with 
the certain data manually, what the python program had fed it, it worked 
fine.

After having attached gdb to the stalled program, I got this backtrace:

#0  0x4159be38 in write () from /lib/libpthread.so.0
#1  0x40c1b7e4 in __JCR_LIST__ () from /usr/local/kde_HEAD/lib/libkdecore.so.4
#2  0x40ab16b9 in kdbgstream::flush() (this=0xbfffdba0) 
at /home/frans/kde/src/kdelibs/kdecore/kdebug.cpp:336
#3  0x0804cf24 in kdbgstream::operator<<(char const*) (this=0xbfffdba0, 
string=0x804df93 "\n") at kdebug.h:232
#4  0x0804cf7c in endl (s=@0xbfffdba0) at kdebug.h:430
#5  0x0804cf5a in kdbgstream::operator<<(kdbgstream& (*)(kdbgstream&)) 
(this=0xbfffdba0, f=0x804cf66 <endl>)
    at kdebug.h:260
#6  0x40037ba0 in 
KDOM::XInclude::Includer::contextPreparationFinished(KDOM::XInclude::IncludeContext*, 
bool) (
    this=0x813e5d0, context=0x8153390, hasErr=false) 
at /home/frans/kde/src/kdenonbeta/kdom/xinclude/Includer.cc:310
<snip long back trace>

And Includer.cc#310, the relevant file, had this:

      kdDebug(26500) << k_funcinfo << endl;

Zimmermann told me that the k_funcinfo macro can sometimes cause trouble(I 
don't know why), but even with such cases removed, I got similar backtraces:

#0  0x415d0e38 in write () from /lib/libpthread.so.0
#1  0x40c507e4 in __JCR_LIST__ () from /usr/local/kde_HEAD/lib/libkdecore.so.4
#2  0x40ae66b9 in kdbgstream::flush() (this=0xbfffdf70) 
at /home/frans/kde/src/kdelibs/kdecore/kdebug.cpp:336
#3  0x0804e3d1 in kdbgstream::operator<<(char const*) (this=0xbfffdf70, 
string=0x804f788 "\n") at kdebug.h:232
#4  0x0804e428 in endl (s=@0xbfffdf70) at kdebug.h:430
#5  0x0804e406 in kdbgstream::operator<<(kdbgstream& (*)(kdbgstream&)) 
(this=0xbfffdf70, f=0x804e412 <endl>)
    at kdebug.h:260
#6  0x4003eb5f in 
KDOM::XInclude::IncludeContext::operator==(KDOM::XInclude::IncludeContext 
const&) const (
    this=0x815aac0, context=@0x8161200) 
at /home/frans/kde/src/kdenonbeta/kdom/xinclude/IncludeContext.cc:555

Where IncludeContext.cc#555 says:
    kdDebug() << "CIRC CHECK::::" << context.includeLocation() << " ONT " << 
includeLocation() << endl;

What is the explanation to these stalls? Is it tied to my setup? Can it be 
fixed somehow/somewhere?


Cheers,

		Frans
 
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