Programming :: Core Dump - Right Memory Block To Be Freed
Nov 8, 2010
In one of our core dump we have the followings in the core back trace:
#0 0xb77bf947 in raise () from /lib/tls/libc.so.6
#1 0xb77c10c9 in abort () from /lib/tls/libc.so.6
#2 0xb77f56ba in __fsetlocking () from /lib/tls/libc.so.6
#3 0xb77fcf7f in mallopt () from /lib/tls/libc.so.6
#4 0xb77fd022 in free () from /lib/tls/libc.so.6
It occurred in a memory block free operation. From our analysis, there seems no issue relate the the memory block it self. The memory pointer pointed to the right memory block to be freed and the contents of the memory seems right (not corrupted), in one world, there is nothing obviously wrong. Does any one have any ideas what could be wrong when seeing about?
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Oct 7, 2009
I want to generate core dump files from my program when it crashes. Its a pretty big process and has about 10-11 threads in it.I have followed the documentation to enable core dump by setting ulimit to unlimited etc. I quickly tried "A demo program creating a core dump" from the following webpage, which succeeds in Segfault and dumping a core file in the directory that I configured.However, I tried running my original program and caused it to crash. I did this by making calls to kill(), raise() or the same null pointer access as shown in the webpage above. In each case, my program crashed but did not generate a core dump file. Am I missing something?My program is in C++ and my environment is Redhat 9.0 (kernel 2.4.20)
Going through the "Why do I NOT get a core dump?" section on the same webpage as above, I can see two potential problems. One - there are issues with the suid/sgid (bullet # 6). I am not able to change any settings with suid because my system does not contain either /proc/sys/fs/suid_dumpable or /proc/sys/kernel/suid_dumpableTwo, my program has threads in it and the bullet # 8 is the problem.
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Apr 19, 2010
I have an application that has pretty large memory profile. The general program flow is as follows:
Code:
main:
do 10 times:
[code]....
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Oct 21, 2010
I am developing an application whose executable is generated inside a certain folder hierarchy (say: /DevPath/MyProject/bin). My source code is located in a different branch of this hierarchy (say: /DevPath/MyProject/src). When my app crashes, its core files are stored in /DevPath/MyProject. I'm developing the app on a pc, but running it on a separate platform in which i can only execute it. Folder hierarchy is the same as above on both computers. Usually, when a new executable version is ready, we update both the executable and the source code on the target platform, transferring all the new /DevPath/MyProject folder on it. But sometimes it can really be a bother, so we update only the executable.
1)In the case we only update the executable, keeping an old source code version, and the app generates a core file, can i trust the backtrace produced by gdb in this case? I.e., does gdb need the latest source code files or it just needs the debugging information?
2) (More radical question ) Do i really need to keep the source code on the target platform for core dump analysis or i just need the executable?
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Jul 21, 2010
To analyse a coredump, I need to specify program name/path in GDB/KDevelop. Since the program name along with arguments is also within a core dump, I wonder if it doesn't keep the proper path of program that crashed and so asks for it?
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Sep 20, 2010
I am trying to port some "C" code from Solaris to Linux. I have a Dell PowerEdge R610 with an Intel Xeon E5504 quad core processor running Red Hat Linux Enterprise 5.3. I am compiling in 64 bit mode. I have managed to get the code compiled and linked, but when I attempt to execute it, I get a core dump in one of the C library calls (like strcpy or printf.)
I have a static library that contains our own code that makes the call to the C library. If I move the library method into the source file with the main method and rename it to be certain that I am executing my method instead of the method in our library, the call succeeds. Eventually another static library call is made that results in a core dump in the shared object. I compile my library code into a static library with gcc as:
[Code]....
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Feb 17, 2010
I'm trying to write a C program that extends an array to any user inputed size.
Code:
if (arraysize == 0) {
arraysize = (int) pos + 1;
a = (int *) calloc (arraysize,sizeof(int));
for (i = 0 ; i < arraysize ; i++ )
a[i] = -1;
code....
The program dumps with that sequence of inputs everytime, but might dump an input before or after if different positions are requested. Interestingly, when I tested pos = 2000..2008, I got no dumps. So is realloc somehow trying to extend the array into bad space?
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Jul 7, 2010
How would I demonstrate that the prior content of a memory resource that has been allocated to one user process is no longer visible when that memory resource is freed and reallocated to another user?
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Apr 15, 2011
I am trying to run C++ program on linux.
My program consume a lot of memory so that the memory is used up fast and memory swap is very high.
I can find this by "ps" .
My program is long.
I need to find out which part of my program consume so much memory ?
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May 27, 2010
To get core dump from my program, I execute the following commands from the terminal:
ulimit -c unlimited
myprogram
After program crash, I see core file in the home directory. How can I make this mode persistent, to have code dump always?
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Jul 27, 2011
In my program, I fork() to get a child process. Because of some problem, child process terminates by a segmentation fault. Parent process is still running. I have compiled my code with -g option. I have done: ulimit -c unlimited. I am not getting core dump of the child process. How can I get the core dump of child process?
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Oct 22, 2010
I modified the following files according to all I found after googling the net:
/etc/security/limits.conf
* soft core unlimited
/etc/profile
ulimit -c unlimited[code]....
I don't get a core file when I kill -11 <pid_of_sleep>
System is centos 5.3
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Dec 29, 2010
I am using RHEL 4.7 (32bit) on HP Proliant 380G6 series server. We are using Electric Cloud Agents on these servers. Nowadays we are facing some memory issues and its creates some kernel panic and then restarts the server. When i reported the issue to my application team, they asked me to come with the core dump. I googled it enough, then i set ulimit value as unlimited. (previously it was 0, then i made a entry in /etc/profile file as follows
ulimit -c unlimited) But still whenever my server restarts due to that kernel panic, it couldnt generate the core dump. My application was installed on /opt
The attached document has the kernel panic logs
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Sep 6, 2010
I have used Dump Command to dump the application files. For Full backup the level 0 is working fine. For incremental backup I used the level 1 or 2 it is getting the error as
DUMP: Only level 0 dumps are allowed on a subdirectory
DUMP: The ENTIRE dump is aborted.
The code I used
===============================
#!/bin/bash
#Full Day Backup Script
#application folders backup
#test is the username
now=$(date +"%d-%m-%Y")
[Code]...
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Nov 12, 2009
i just touch linux, may i know how can i convert the core dump file to a readable textfile, which include all the information, which is in core dump, such as all variables, threads information, call trace for each tasks, and so on. i know use the GDB can view this, but it won't dump all the informations to one text file. but sometimes, people want to view the core dump reason without Linux environment.
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Apr 21, 2010
is there a way to get GDB to dump memory map so I can see if certain parts of the memory is executable or not (i.e : if heap/stack is executable). Do you know of a way to do this within GDB session?
Just didn't use gdb, and did instead:
cat /proc/$PID/maps
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Dec 10, 2010
how to collect the memory Dump In Linux?
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Feb 4, 2010
This is opensuse 11.2.
Somehow zypper is running at 100% cpu and won't die with command line kill, the system monitor kill, terminate or anything. I set it's priority to the lowest it will go, tried to stop it then kill it, nothing works as it simply is not responding to anything and it has been running now for 47 hours.
Is there a way to simply dump a process out of memory without requiring it to respond to a signal? because signals are doing nothing.
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Oct 31, 2010
Is there any Linux API that will let me control on what core will a thread run? If not, do I have to use assembly language?
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Apr 27, 2010
Assume someone bind a particular process to a particular CPU core(In multi core machine) by using sched_setaffinity() like functions. Then how we can get that process running core id and CPU core utilisation of that process on that running CPU core(Pragmatically or by a Linux command)?.
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Apr 28, 2009
How do I get a full kernel dump?
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Nov 27, 2010
I have a desktop system (P55-USB3 + Core i7 + Ubuntu 10.10) that fails to suspend/resume from memory. So I'm trying to diagnose the problem. The first obstacle was easy enough --- when I put the system to sleep to memory, the computer comes back alive right away. A look at /var/log/kern.log revealed that one USB device (usb10) failed to suspend, and from there I was able to pin it down to the USB3 controller in the BIOS. Disabled that and this problem disappeared.
Now, I'm stuck with the second obstacle. The computer successfully goes into the suspend mode, but it hangs during resume. The monitor doesn't get any video signal, and it fails to respond to ping (netconsole doesn't work either.) After a forced reboot (that involves unplugging the power cable), /var/log/kern.log doesn't contain any interesting entries. All the pm_test modes from freezer to core succeed (I followed [URL] I've also tried pm_trace (https://wiki.ubuntu.com/DebuggingKernelSuspend) but again kern.log nor dmesg contains anything after the suspend. Either the write didn't survive the forced power off, or the resume is failing even before that. The motherboard doesn't have a serial port nor firewire, so getting kernel logs through them is not a possibility, either.
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Mar 21, 2011
I am new to C and linux. My code below does arbitary writes but I cant figure out where or how it does it.
I am calling the insertNode() function with seq = 'MISSISSPPI$' and alphabets = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ$'
Code:
Weird behaviour I should mention is that when I check for NULL pointer in node->child[index], the unassigned values are not null anymore, they point to arbitary memory.
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Apr 13, 2010
How do I write a script for my Linux that can show me total memory vs used memory and have it email me results if it's over 70 percent?
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Apr 21, 2010
I have a process which runs for a while and then due to some unknown reason ends abruptly without giving a core. I tried looking in the logs and after watching for a pattern am still not 100% sure of the reason. So I was wondering if there is a way to catch the signal which ends the process and print some values in the handler function. I have called the handler for SIGTERM and SIGABRT functions but none of these are getting triggered. I looked online and did not find any other option. Can you please suggest if tehre is any other signal that can be caught for this unknown abrupt termination.
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Aug 25, 2010
Is that possible that SHM shared memory is counted as cache memory on Linux with kernel 2.6.18?If find it really odd since this memory is not file backed, but I have a piece of code that loads data using shm_open+mmap, and it generates an amount of cache memory in /proc/meminfo that corresponds exactly to the amount of shared memory (I load that data from a file but I am using posix_fadvise(fd,0,0,POSIX_FADV_DONTNEED) to ensure this file is not cached and I made sure that it is working as expected). As far as I know SHM memory was not tagged as cache memory with kernel 2.6.9.If it is the case it is really unfortunate since normally cache memory can be considered to be part of the "available" memory since it can be flushed promptly but this is clearly not the case with SHM memory... Is there an easy way to get the total amount of used SHM memory on a system?
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Oct 31, 2009
I have been having mysterious problems with my comp recently and I think it might have to do with my OS not releasing filespace. Previously, my OS partition was full, then I deleted/moved some files, but now it says that still no space is available:
[root@cluster log]# df -h (simplified):
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 7.9G 7.6G 0 100% /
/dev/md0 459G 110G 327G 26% /export
[root@cluster log]#
The OS being /dev/sda1 (I am 99% sure, didn't set it up originally) and is CentOS4. As you can see, I have only used 7.6GB, and I should have 300MB available. Only thing I can think of is that when it was full, I moved matlab from there to the /export drive and added in a symbolic link to where it was on the OS drive so it would still work ok. Could this be why the space is not being freed up? We are in the process of installing a 16TB drive so we can free up some space or expand the partition, but somebody else here at work is handling that, so some other option that I could do would be best.
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Jul 23, 2010
I did a rm on a file that was 63GB, but then when i do a df -h afterward, it doesn't reflect that file being removed.
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Jan 10, 2011
Making a custom gui for micro core linux. az i want to make a ditro based on it.
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Aug 3, 2010
My system has Intel Xeon 4-core cpu(hyperthreading 8-core) and run 64-bit linux. I want to allocate one core for general process(kernel process & other processes). And then, I want to allocate the rest of core for the specific multi-thread program.
Q1: I know that I can pthread_setaffinity() for user-mode thread and mpstat for monitoring. So, how can I allocate a core for kernel process and monitor it?
Q2: How can I restrict use of the cores for the multi-thread program? I don't want kernel process to use the cores for the multi-thread program.
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