gdb "Core was generated by" truncated to 80 characters

Jonny Grant
Tue May 26 11:07:34 GMT 2020

[Not sure if this got through to  so resending]


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()
return 0;

$ ./signal 
Trace/breakpoint trap (core dumped)
$ gdb -c core signal
GNU gdb (Ubuntu 8.1-0ubuntu3.2)
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License GPLv3+: GNU GPL version 3 or later <>
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There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
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

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