Re: [Libevent-users] Segfault under specific conditions

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Subject: Re: [Libevent-users] Segfault under specific conditions

From: David Titarenco <david.titarenco@xxxxxxxxx>

Date: Wed, 10 Mar 2010 01:22:45 -0800

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On Tue, Mar 9, 2010 at 4:38 PM, Niels Provos <provos@xxxxxxxxx> wrote:

Hi David,

On Tue, Mar 9, 2010 at 1:00 PM, David Titarenco

<david.titarenco@xxxxxxxxx> wrote:

> My server segfaults/crashes/etc under high load. It's fairly simple and
> nothing is intrusive. The following is the most recent crash report from
> earlier today:
>
> Program received signal SIGSEGV, Segmentation fault.
> 0xb7f6c1f6 in evhttp_add_header_internal (headers=0xfffffc40, key=0xb7f7fc45
> "Connection", value=0xb7f7fc50 "close") at http.c:1467
> 1467 TAILQ_INSERT_TAIL(headers, header, next);
> Current language: auto; currently c
> (gdb) bt
> #0 0xb7f6c1f6 in evhttp_add_header_internal (headers=0xfffffc40,
> key=0xb7f7fc45 "Connection", value=0xb7f7fc50 "close") at http.c:1467
> #1 0xb7f6f4a7 in evhttp_send_error (req=0xb7e3af50, error=504,
> reason=0x813d24b "Update the state. Hit PHP!") at http.c:2050

Thanks for the report. Where do you get the request pointer from?
Could you print the contents in gdb? My best guess is that the
request got freed underneath you for some reason.

Niels.
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