[Dnsmasq-discuss] dnsmasq crash - no core dump generated

[Arvind Nagarajan]

Thanks Simon. Yes I am able to generate coredump with your suggestion.

Date: Fri, 28 Dec 2018 09:59:29 +0000
From: Simon Kelley <simon at thekelleys.org.uk>
To: dnsmasq-discuss at lists.thekelleys.org.uk
Subject: Re: [Dnsmasq-discuss] dnsmasq crash - no core dump generated
Message-ID: <8980a6c8-59db-1c76-2afe-7eac1096d438 at thekelleys.org.uk>
Content-Type: text/plain; charset=utf-8

This code is relevant, in src/dnsmasq.c


  if (option_bool(OPT_DEBUG))
    prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);



Cheers,

Simon.
</simon at thekelleys.org.uk>
On Thu, Dec 27, 2018 at 7:40 PM Arvind Nagarajan
<arvind.nagarajan at gmail.com> wrote:
>
> Hi All,
>
> When dnsmasq crashes due to segfault (SIGSEGV) I am not getting a core
> file generated.
> Is this expected?
> dnsmasq is managed by systemd and started using
> systemctl start dnsmasq.
> The dnsmasq service file starts dnsmasq with '-k' option - keep in
> foreground mode.
>
> Howerver If I run the dnsmasq in debug mode using '-d' mode the core
> dump is getting generated.
>
> Do I need to add any signal handling code/any config knob to generate
> core dump in -k' mode.
> Any pointers regarding this will be helpful.
>
> Thanks,
> Arvind