Signal 6

Michael Sierchio kudzu at tenebras.com
Fri Jun 29 15:57:59 UTC 2018


One way to find out is to register a handler for SIGABRT and print and
flush the context.

On Fri, Jun 29, 2018 at 8:56 AM, Michael Sierchio <kudzu at tenebras.com>
wrote:

> Are there process limits?
>
> malloc() will call abort() if internal structures are munged (e.g., by
> heap overflow).
>
> calling free() on a corrupted pointer does that reliably
>
> is the root partition big enough for the dump?
>
> = M
>
> On Fri, Jun 29, 2018 at 8:40 AM, Doug Hardie <bc979 at lafn.org> wrote:
>
>> I have a daemon process that runs forever (almost).  Something is killing
>> it with a signal 6, but no core dump is done.  If I manually kill it with
>> kill -6, then the log message shows core dumped and a core file is
>> created.  The process has no reference to SIG_ABRT, so I suspect the kernel
>> is doing the kill and is overriding the core dump.  I have previously
>> encountered a similar issue where swap space was running out and the kernel
>> killed this process without a core dump.  In that case there were quite a
>> few messages logged about swap space issues before the process was killed.
>> There are no swap messages logged this time.
>>
>> /etc/sysctl.conf contains:
>> kern.sugid_coredump=1
>> kern.corefile=/crash/%N.core
>>
>> /crash is a directory in the root file system.
>>
>> Other than swap issues, when would the kernel kill a process without a
>> core dump?
>>
>> -- Doug
>>
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>
>
>
> --
> "Well," Brahma said, "even after ten thousand explanations, a fool is no
> wiser, but an intelligent person requires only two thousand five hundred."
>
> - The Mahābhārata
>



-- 
"Well," Brahma said, "even after ten thousand explanations, a fool is no
wiser, but an intelligent person requires only two thousand five hundred."

- The Mahābhārata


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