coredump in 1.10.3

[Alexey Ivanov]

We have couple of these per week, I was blaming our third party modules, but seems like vanilla is also affected.

> On Mar 13, 2017, at 7:22 AM, George . <george at ucdn.com> wrote:
> 
> Yes, for me it looks like memory corruption and really hard to guess with only bt.
> We will run with  in-memory debug, but we have to wait till next core. I'll update you when we have more info.
> 
> On Mon, Mar 13, 2017 at 3:55 PM, Valentin V. Bartenev <vbart at nginx.com> wrote:
> On Monday 13 March 2017 15:24:46 George . wrote:
> > Hi Valentin, Sorry, I've sent the mail incidentally before I complete it ;)
> >
> >
> > ssl_proxy_cores # ./nginx -V
> > nginx version: nginx/1.10.3
> > built by gcc 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4)
> > built with OpenSSL 1.0.2g  1 Mar 2016 (running with OpenSSL 1.0.2g-fips  1
> > Mar 2016)
> > TLS SNI support enabled
> > configure arguments: --prefix=/cdn/nginx_ssl_proxy --with-cc-opt='-O0 -g
> > -ggdb -march=core2' --with-debug --with-http_geoip_module
> > --with-http_realip_module --with-http_ssl_module
> > --without-http_charset_module --without-http_ssi_module
> > --without-http_userid_module --without-http_autoindex_module
> > --without-http_scgi_module --without-http_uwsgi_module
> > --without-http_fastcgi_module --without-http_limit_conn_module
> > --without-http_split_clients_module --without-http_limit_req_module
> > --with-http_stub_status_module --with-http_v2_module
> >
> >
> > and some variables values :
> >
> >
> > (gdb) p q
> > $1 = (ngx_queue_t *) 0x3fb0ab0
> > (gdb) p * q
> > $2 = {prev = 0xd3210507e0f72630, next = 0x5f5ded63e9edd904}
> > (gdb) p h2c->waiting
> > $3 = {prev = 0x3ac6ea0, next = 0x3fb0ab0}
> >
> >
> > and here is the config
> >
> [..]
> 
> Unfortunately, backtrace in this case is almost useless.
> 
> You should enable in-memory debug log:
> http://nginx.org/en/docs/debugging_log.html
> 
> Thus it will be possible to trace the events that resulted
> in segfault.
> 
>   wbr, Valentin V. Bartenev
> 
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