#1 segfault on x86_64

[Oden Eriksson]

kiax-0.8.4 segfaults on x86_64 :(

OS: Mandrakelinux 10.1/10.2

[growchie]

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which package do you use? there are no official packages for
mandrake provied by us yet.

[Oden Eriksson]

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I'm the package maintainer for kiax and iaxclient, plus all the
asterisk stuff. kiax-0.8.3 did not segfault. Ehh, these packages
are in the Mandriva cooker contrib rep.

And btw. Mandrakelinux has changed name to Mandriva, I
seem to forget that fact myself...

[growchie]

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Ok. What segfaults, the binary you compile from the sources,
or some package, downloaded from here, and paste the exact
error pls.

[Emo]

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Strange. Do you do the packages from source or from binaries?
If you have managed to package 0.8.3 from source it shouldnt
be a problem for 0.8.4 as there is no added platform
dependency in the new version.

Please send a log or whatever that can help to Velislav.

[Oden Eriksson]

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I tried to provide some useful stuff with strace, but the output
didn't seem so useful to me. Please tell me how I should do to
provide the info you want.

[Oden Eriksson]

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OK. Maybe this will help:

[oden@oe bin]$ gdb ./kiax
GNU gdb 6.3-3mdk (Mandrakelinux)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public
License, and you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty"
for details.
This GDB was configured as
"x86_64-mandrake-linux-gnu"...Using host libthread_db library
"/lib64/tls/libthread_db.so.1".

(gdb) run
Starting program: /home/oden/RPM/BUILD/kiax-0.8.4/bin/kiax
[Thread debugging using libthread_db enabled]
[New Thread 46912547355552 (LWP 27364)]
Sun Apr 17 19:50:57 2005 Using IAXClient ver.
CVS-2005/04/15-16:47

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 46912547355552 (LWP 27364)]
0x00002aaaabebb890 in strlen () from /lib64/tls/libc.so.6
Current language: auto; currently c

Furthermore I make the iaxclient code as a shared library and
link against that using patches. But I have also built this kiax
version using the bundled iaxclient code and get the same
segfault. I'm no gdb expert, nor a coder.

[growchie]

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you may try DDD. this is graphical frontedn for gdb. But
before you could use this you should recompile the client
with debug option. (look at the src.pro.or file in the
./src dir.)
look for config += and change the firs line from release to
debug. Try to figure out the exact point it fails. I dont
have access to amd64 machine so it is extremely difficult
for me to figure out the problem. I suspect that migth be
problem with a #define we added for recompilation of the
corresponding paths for the icons and translations.

[Emo]

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OK, it seems really, as Velislav suggested, something
happens in the new debug method. And as I see after applying
the va_list macro (earlier it was rather different
implementation). The bad thing is really we don't have any
x86_64 machine here to test..hmm. I'll have a look and try
to suggest something.
Thanks.

[Oden Eriksson]

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i can provide you with a chrooted one. mail me in private and i
make the arrangements. mail me at oeriksson (at) mandriva
(dot) com. join the #mandriva-cooker channel at freenode and
we can discuss this in realtime. mail me your nick so that i know
who you are.

i just tried ddd, but the only thing i get is:

[New Thread 46912547355552 (LWP 22028)]
Mon Apr 18 13:04:16 2005 Using IAXClient ver.
CVS-2005/04/18-12:33

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 46912547355552 (LWP 22028)]
0x00002aaaabebb890 in strlen () from /lib64/tls/libc.so.6
Current language: auto; currently c
(gdb)

[Emo]

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Here is a diff that refers a similar problem in
mysql-client. The va_* macros behave on x86_64 strangely
when there are two nested v* methods. It seems that a
workaround shown by Sergey Kostyliov fixes this (more info:
http://bugs.mysql.com/bug.php?id=8499\). Please try to patch
your iaxwrapper.cpp file with this .diff and run it on
x86_64. Hopefully it works (on 32bit there is no problem
also so). If not, then we can try with your offer for
chrooted acces and continue trying..

Here is the diff:

Index: iaxwrapper.cpp

--- iaxwrapper.cpp (revision 275)
+++ iaxwrapper.cpp (working copy)
@@ -604,14 +604,16 @@
{
QString dateStr = QDateTime::currentDateTime().toString();
va_list ap;
- va_start (ap, log);
QString finalLog;
finalLog = dateStr +" "+ log;
+ char debug_buf[500];
+ va_start (ap, log);
vfprintf (stderr, (const char*)finalLog, ap);
- char debug_buf[500];
+ va_end (ap);
+ va_start (ap, log);
vsnprintf (debug_buf, 499, (const char*)finalLog, ap);
+ va_end (ap);
emit signalDebug(debug_buf);
- va_end (ap);
}

void IaxWrapper::debugStatistics(int callNo, int callInterval)

[Oden Eriksson]

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That worked!