Approved: Fortect
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A stomach dump is a file automatically created by the Linux kernel when a program crashes. This file contains the main memory, registry values, and application call group at the time of the crash.
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Sometimes it is literally impossible to debug an application directly. In situations where you can collect information about the application regarding its closure for a moment, and then analyze it.
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This page describes what Core Dump is and how to use it.
Requirements
- Understanding debugging in terms of information
Description
A core dump is a copy of a portion of an application’s memory, visited when the application stops working, and saved in ELF format. It contains most of the application’s internal and stack variables, and usually allows you to check the final form of the application. Enriched with the appropriate executable and debugging information, one can check the memory dump file with a good reliable debugger, just like comparing a running program.
A full kernel running on Linux can automaticallySave core dumps if this feature is enabled. In addition, you can send a signal to any running application to generate a memory dump, whether it is the current state or not.
Some restrictions may affect the ability to create a memory dump.
21.2. Capturing Application Crashes With A Core Dump
To log application crashes, collectively stop logging core dumps and add system facts.
Procedure
-
Enable memory dumps. Edit the file
/etc/systemd/system.conf
and change the order containingDefaultLimitCORE
as follows:DefaultLimitCORE=infinite
-
Reboot our system:
# shutdown -r now
-
Remove restrictions on the size of the main dump:
# ulimit -c unlimited
To undo the previous change, run the command with a profit of 0 instead of unlimited.
- When an application incident occurs, a core dump is generated. By default, the location of core dumps is the working directory of the main application at the time of our own failure.
-
Create an SOS report to provide more detailed system information:
#sosreport
This creates a nice archive containing information about your configuration, such as copies of configuration files.
-
Transfer a specific memory dump and SOS report to a computer where debugging has been removed. Transfer the executable if you want it to load, this is known.
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If the executable is not literally known, further analysis of the base file will identify it.
- Optional: Delete the heart dump and mark it after transferring these types of files to free up disk space.
Additional Resources
21.3. Application Verification States With Dump
Requirements
- You need a core dump file and an SOS report
- GDB and elfutils are installed on his system
Procedure
-
To identify the executable that failed completely, run the
eu-unstrip
command on the main dump file:$eu-unstrip -n --core=./core.98140x400000+0x207000 2818b2009547f780a5639c904cded443e564973e@0x400284 /usr/bin/sleep /usr/lib/debug/bin/sleep.debug [exe]0x7fff26fff000+0x1000 1e2a683b7d877576970e4275d41a6aaec280795e@0x7fff26fff340! -linux-vdso.so.10x35e7e00000+0x3b6000 374add1ead31ccb449779bc7ee7877de3377e5ad@0x35e7e00280 /usr/lib64/libc-2.14.90.so /usr/lib/debug/lib64/libc-2.14.90.so.debug libc.so.6/usr/lib64/ld-2.14.90.so /usr/lib/debug/lib64/ld-2.14.90.so.debug ldx-282->The output includes information about each individual module on a separate line in the schema. The information is listed in this valuable order:
- Memory address where the module was mapped
- The assembly ID of the module and where it was found in memory
- Filename of the executable module, displayed as
-
if unknown, or as.
if the course was not loaded from a file - Source of debug information, displayed under a different filename if available, as
.When
is included in the executable itself and/or as-only when
- Shared library name (soname) or
[exe]
due to main module
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and the assembly ID 2818b2009547f780a5639c904cded443e564973e
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- If possible, copy it from the system where the failure occurred. Usually use the filename extracted from the base file.
You can also use the identical executable on your system. Every executable file created by Red Hat Enterprise Linux includes an a suffix with each unique assembly ID value. Determine the build ID associated with the corresponding locally available executables:
$ eu-readelf -n executable
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Use this information to match the executable on the remote system with your local copy. The build ID of the local file and the build ID specified in the memory dump must match.
- Finally, if the application is installed from a package, the client can get the executable of the entire package. Use
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