gdb "Core was generated by" truncated to 80 characters

[Jonny Grant <jg@jguk.org>]

[Not sure if this got through to bug-gdb@gnu.org  so resending]

Hello

Just noticed my command line args of a core file are truncated, so it's hard to reproduce the crash as I don't know what 
the core was generated from.

"Core was generated by" truncated to 80 characters in the below example.

May I ask, is this a limitation of the kernel dump or gdb? When i use 'strings' I see the core does contain the full 
command line.

Sorry I know my gdb isn't the latest, it's Ubuntu LTS

I tried setting .gdbinit 'set width unlimited'
but the output is still truncated.

Example below

// gcc-8 -Wall -o signal signal.c


#include <signal.h>

int main()
{
raise(SIGTRAP);
return 0;
}




$ ./signal 
myverylonglonglongmyverylonglonglongmyverylonglonglongmyverylonglonglongmyverylonglonglongmyverylonglonglongmyverylonglonglongmyverylonglonglongmyverylonglonglongmyverylonglonglongfz
Trace/breakpoint trap (core dumped)
$
$ gdb -c core signal
GNU gdb (Ubuntu 8.1-0ubuntu3.2) 8.1.0.20180409-git
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Reading symbols from signal...(no debugging symbols found)...done.
[New LWP 27437]
Core was generated by `./signal myverylonglonglongmyverylonglonglongmyverylonglonglongmyverylonglonglo'.
Program terminated with signal SIGTRAP, Trace/breakpoint trap.
#0 __GI_raise (sig=<optimised out>) at ../sysdeps/unix/sysv/linux/raise.c:51
51 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) q