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  #1 (permalink)  
Old June 14th, 2003
Quastor
Guest
 
Posts: n/a
Default Signal 11 (SIGSEGV) Crash

After mostly 1 minute Qtella crashes with this failure. Anyone knows what this means?

I've got Mandrake 9.1
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  #2 (permalink)  
Old June 14th, 2003
Quastor
Guest
 
Posts: n/a
Default

And it's a selfcompiled Qtella 0.6.1
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  #3 (permalink)  
Old August 26th, 2003
Novicius
 
Join Date: August 26th, 2003
Posts: 3
msimplay is flying high
Default

i also get these errors on mandrake 9.1
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  #4 (permalink)  
Old October 2nd, 2003
Devotee
 
Join Date: September 30th, 2003
Posts: 27
rockkeys is flying high
Default

Almost all signal 11 crashes (segment faults) are caused by a reference to the object of a null pointer, which is address 0x0000.

In almost every OS, and in every UNIX I have ever used, it is illegal for a program to read from or write to address Zero.

The idea behind this is that no program can ever have address zero as part of it's data, so that reading or writing to that address is indicating a bug. The OS traps this, and tells you that you have accessed a memory segment that doesn't belong to you, or in other words a segment fault.

All UNIX systems (i think) use signal 11 for this, although it could use a different signal, and still map it to the segfault error if needed.

Anyway, if that's happening to you, it most likely because a variable is being used without being initialized to point to valid memory. An uninitialized variable usually is forced to contain a zero, just for that reason. When they are initialized, they are set to some valid address, which then allows the use of the variable normally.

There could be other reasons for this to happen, but the reason above is almost always the cause. An incorrectly formed query, with data missing, and not caught before being processed, could also cause a problem like this. But most programs are very careful with incomming data, and verify that they are valid and complete before trying to process then. But that is a possible second cause for a segfault, and again it indicates a bug (or poor programming).

Regards,
--R
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  #5 (permalink)  
Old November 19th, 2003
Novicius
 
Join Date: November 19th, 2003
Posts: 3
dfaure is flying high
Default Crash fixes

I have developed a number of crash fixes, that haven't been merged into qtella yet.

This applies to the current sourceforge anoncvs, but it should also apply to the last release.

David.
Attached Files
File Type: txt fulldif.txt (17.8 KB, 722 views)
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  #6 (permalink)  
Old January 2nd, 2004
Novicius
 
Join Date: January 2nd, 2004
Location: Canada
Posts: 1
BritishDude is flying high
Default Same crash, different system and circumstances

Hi,

Just to report that I am experiencing a Signal 11 crash 10-15secs after clicking connect (If I don't the app seems stable but obviously is useless!).

I have a self compiled Qtella-0.6.4 running on Redhat 9.0 (with Kde). Qtella remains in the process list after the crash and dies with a backtrace as follows:

[New Thread 1092418880 (LWP 6942)]
[New Thread 1100811456 (LWP 6943)]
0xffffe002 in ?? ()
#0 0xffffe002 in ?? ()
#1 0x4076e5bd in KCrash::defaultCrashHandler(int) ()
from /usr/lib/libkdecore.so.4
#2 <signal handler called>
#3 0x40224f21 in QApplication::internalNotify(QObject*, QEvent*) ()
from /usr/lib/qt-3.1/lib/libqt-mt.so.3
#4 0x40224b19 in QApplication::notify(QObject*, QEvent*) ()
from /usr/lib/qt-3.1/lib/libqt-mt.so.3
#5 0x407021e9 in KApplication::notify(QObject*, QEvent*) ()
from /usr/lib/libkdecore.so.4
#6 0x401ffd95 in QEventLoop::activateTimers() ()
from /usr/lib/qt-3.1/lib/libqt-mt.so.3
#7 0x401dd8e8 in QEventLoop:rocessEvents(unsigned) ()
from /usr/lib/qt-3.1/lib/libqt-mt.so.3
#8 0x40238cf6 in QEventLoop::enterLoop() ()
from /usr/lib/qt-3.1/lib/libqt-mt.so.3
#9 0x40238b98 in QEventLoop::exec() () from /usr/lib/qt-3.1/lib/libqt-mt.so.3
#10 0x40225151 in QApplication::exec() ()
from /usr/lib/qt-3.1/lib/libqt-mt.so.3
#11 0x0809e84b in main (argc=1, argv=0x4068427c) at main.cpp:79
#12 0x42015574 in __libc_start_main () from /lib/tls/libc.so.6

Any assistance greatly appreciated.

Ed.

P.s. David: can't work out what to do with your fixes (or if they apply) - sorry am kinda a Linux Newbie (former M$ heavyweight though, and learning fast!).
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  #7 (permalink)  
Old January 2nd, 2004
Novicius
 
Join Date: November 19th, 2003
Posts: 3
dfaure is flying high
Default Re: Same crash, different system and circumstances

The only way to understand such crashes is to run "valgrind qtella" (after installing valgrind).
The gdb backtrace is unfortunately not useful.

To apply the fix: you need to be able to compile qtella from sources.
Save fulldif.txt into the qtella sources, launch konsole, go to the qtella sources, then type
patch -p0 < fulldif.txt
It should show a list of files successfully modified. Then recompile as usual.
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  #8 (permalink)  
Old October 28th, 2006
Novicius
 
Join Date: October 28th, 2006
Posts: 1
thejasviv is flying high
Default Production Server problem

Hi Guys,

I support an application that is deployed on an AIX(Unix) production server. Every saturday midnight, for some reason, the WebSphere process of the application goes down. When I analyzed the java core dump(the memory image of the WebSphere process at the state of going down) I found that the process had recieved a "signal 11" before going down.

To my dismay, this scenario happens only on saturday nights. All the rest of the days, it runs perfectly alright. Can someone think of a reason for this? Or may you guys be able to direct me to some other useful forum?

Thanks,
Thejasvi V
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LinkBack to this Thread: https://www.gnutellaforums.com/qtella-linux-unix/20637-signal-11-sigsegv-crash.html
Posted By For Type Date
What is SIGNAL 11 AIX? This thread Refback October 22nd, 2012 03:33 AM
What is SIGNAL 11 IN LINUX? This thread Refback February 23rd, 2012 10:36 PM
What is SIGNAL 11 UNIX? This thread Refback September 21st, 2011 12:25 AM
What is SIGNAL 11 SIGSEGV? This thread Refback August 11th, 2011 04:14 AM
What is SIGNAL 11 AIX? This thread Refback August 9th, 2011 03:05 AM
Multiple KDE application crashes (signal 11, SIGSEV) in MEPIS and Kubuntu - Linux Forums This thread Refback January 24th, 2011 02:15 AM

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