How to create core through program at the time of crash by handling signals? Post: 302740833

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Operating Systems Solaris How to create core through program at the time of crash by handling signals? Post 302740833 by rajeev_ks on Friday 7th of December 2012 12:04:56 AM

Old

12-07-2012

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Quote:

Originally Posted by jim mcnamara

The simple way to get a core that "starts" at the fault is not to block signals. Obviously this has some very bad downsides.

Otherwise with what you have done you have to traverse stack frames back to the problem, in gdb this is the

Code:

backtrace

command. Signal receipt when blocked causes an immediate interrupt to the executing code, pushing the state of the process and kernel onto the interrupt stack. Working backwards can be fun.

Some example code for gaddr2line():

Note that you should consider libelf instead of the python library.

I am using dbx for debugging core and the corresponding command for backtrace is where in dbx. But as I said earlier I am getting the stack of signal handler routine through backtrace and not the location of faulty code.

rajeev_ks

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LEARN ABOUT CENTOS

abrt-action-generate-core-backtrace

ABRT-ACTION-GENERA(1)						    ABRT Manual 					     ABRT-ACTION-GENERA(1)

NAME

       abrt-action-generate-core-backtrace - Generates coredump-level backtrace

SYNOPSIS

       abrt-action-generate-core-backtrace [-v] [-r] [-d DIR]

DESCRIPTION

       This tool uses coredump from the file coredump and binary at the path stored in file executable in the problem directory to generate
       coredump-level backtrace.

       Coredump-level backtrace resembles ordinary backtrace in that it contains information about call frames present on the stack at the time of
       the crash. However, it only contains information that can be obtained from the coredump without debugging symbols available - mainly
       relative addresses of the stored instruction pointers. Such backtrace can still be useful for reporting and reproducing the bug and does
       not require debugging information files to be installed.

       The result is saved in the problem directory in a file named core_backtrace.

   Integration with libreport events
       abrt-action-generate-core-backtrace can be used as an analyzer for application crashes which dump core.

       Example usage in report_event.conf:

	   EVENT=analyze analyzer=CCpp
		   abrt-action-generate-core-backtrace

OPTIONS

       -d DIR
	   Path to problem directory.

       -r
	   Do not hash function fingerprints. Useful for debugging.

       -v
	   Be more verbose. Can be given multiple times.

AUTHORS

       o   ABRT team

abrt 2.1.11							    06/18/2014						     ABRT-ACTION-GENERA(1)