Debug::DumpCore - Generate a SegFault
use Debug::DumpCore; Debug::DumpCore::segv();
This module implements a buggy C function which tries to dereference a NULL pointer, which generates a SEGFAULT. It is used to test the Debug::FaultAutoBT module that attempts to automatically generate a backtrace when some fatal signal is delivered, without needing the core file.
Debug::FaultAutoBT
Notice that you could use Perl's CORE::dump to achieve the same goal, but dump()'s backtrace is not very useful for teaching purposes. Debug::DumpCore::segv() calls another proper C function which finally calls a buggy C function, which causes a SEGFAULT. So you get a long trace. For example this is the backtrace generated on my machine:
CORE::dump
Debug::DumpCore::segv()
#0 0x402b979b in crash_now_for_real ( suicide_message=0x402ba040 "Cannot stand this life anymore") at DumpCore.xs:246 #1 0x402b97bd in crash_now ( suicide_message=0x402ba040 "Cannot stand this life anymore", attempt_num=42) at FaultAutoBT.xs:253 #2 0x402b983e in XS_Debug__DumpCore_segv (cv=0x81751e4) at FaultAutoBT.xs:262 #3 0x400851ec in Perl_pp_entersub () from /usr/lib/perl5/5.6.1/i386-linux/CORE/libperl.so
And the corresponding C code around line 246 is:
7: crash_now_for_real(char *suicide_message) 8: { 9: int *p = NULL; 10: printf("%d", *p); /* cause a segfault */
None.
Stas Bekman <stas@stason.org>
perl(3), Debug::FaultAutoBT(3).
Debug::FaultAutoBT(3)
To install Debug::FaultAutoBT, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Debug::FaultAutoBT
CPAN shell
perl -MCPAN -e shell install Debug::FaultAutoBT
For more information on module installation, please visit the detailed CPAN module installation guide.