gdb "Core was generated by" truncated to 80 characters

Simon Marchi simark@simark.ca
Thu Jun 11 02:32:12 GMT 2020


On 2020-06-07 6:27 p.m., Jonny Grant wrote:
> 
> 
> On 26/05/2020 15:09, Simon Marchi wrote:
>> On 2020-05-26 7:07 a.m., Jonny Grant wrote:
>>> [Not sure if this got through to bug-gdb@gnu.org  so resending]
>>
>> gdb@sourceware.org is the right place.
>>
>>> 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.
>>
>> You see the name of the process as dumped by the kernel, which truncates it at
>> a certain length.  Here's the corresponding code in the kernel, where you see it
>> limited at 80 characters:
>>
>> https://elixir.bootlin.com/linux/v5.6.14/source/include/uapi/linux/elfcore.h#L79
> 
> It's a shame that is so small, the arguments are visible when running I thought in ps aux. Do you know who is the 
> maintainer of that file please?

This is maintained in the Linux kernel.

https://www.kernel.org/doc/html/latest/process/development-process.html

Simon


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