TLDR: Can’t find the core dump even after setting ulimit and looking into apport. Sick of working so hard to get a single backtrace. Questions on the bottom. I’m having a little nightmare here. I’m currently doing some c coding, which in my case always means a metric ton of segfaults. Most o…
Tag: debugging
could not to setup crash dump on centos7 for debug kernel
I am trying to setup kdump to generate the vmcore for kernel-3.10.0-123.el7. For the perf kernel kernel-3.10.0-123.el7.x86_64.rpm i setup kdump and kdump is working fine too, generating vmcore. Then i installed kernel-debug-3.10.0-123.el7.x86_64.rpm using yum install kernel-debug-3.10.0-123.el7.x86_64.rpm and…
How to cross compile system tap scripts for user space application
The challenge that I faced was on identifying the process name / library name within the script.During the cross compilation the process name and library name are being referred with real path of process/library in the host (which I understood after peeked the generated .ko). Since the real path of host and t…
debugging long running PHP script
I have php script running as a cron job, extensively using third party code. Script itself has a few thousands LOC. Basically it’s the data import / treatment script. (JSON to MySQL, but it also makes a lot of HTTP calls and some SOAP). Now, performance is downgrading with the time. When testing with a …
How to understand the ARM registers dumped by kernel panic?
After Linux kernel oops on ARM platform, registers are dumped to console. But I got confused with analyzing these registers. For example, Questions: What does the 0xc0705970 stands for in SP: 0xc0705970:? Code address or data address? Where to find it? Why sp : c07059f0 is not at the beginning or end of SP re…
Why does my assembly program give segfault?
I have the following piece of code that I have to debug: After compiling and running that code I obtain a segmentation fault error, it seems that something goes wrong after the 5th line. My linux asm knowledge is very basic, any hints or ideas about what is exactly going wrong and how to fix it? This piece of…
Debug information file conventions for Red Hat/Fedora?
According to lothar’s answer at How to generate gcc debug symbol outside the build target, I can create a two part executable – the stripped executable and the debug information file. After creating the stripped executable and the debug information file, I install the executable as normal (with ma…
visually debug GTK3 applications (GtkInspector / gtkparasite)
Trying to debug a GTK theme, I modified. Having corrected most of the issues with the theme, I Still cannot figure out, what color setting is responsible for background color in some input-fields or text-views. SETUP I can start GtkInspector as well as gtkparasite with Gtk3 applications (starting those debugg…
Good way to debug stack value corruption
What is a good way to debug stack value corruption. In a program of mine sometimes the address of the this pointer gets changed after a method returns that does a shutdown on a file descriptor. I debugged the program for hours but I can not find the problem. What is a good method to find out what changes the
debugging c using heap memory [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. This question does not appear to be about programming within the scope defined in the help center. Closed 9 years ago. Improve this question I am working with heap memory and I wrote an example below: I execu…