Odd crash

[Andrei]

On Mon, Feb 20, 2017 at 7:13 AM, Dridi Boukelmoune <dridi at varni.sh> wrote:

> On Mon, Feb 20, 2017 at 1:09 PM, Andrei <lagged at gmail.com> wrote:
> > Hi Dridi,
> >
> > Thanks for the input. Looking over the panic I initially linked, the
> exact
> > version info was:
> >
> > version = varnish-4.1.4 revision 4529ff7 ident =
> > Linux,2.6.32-642.6.2.el6.x86_64,x86_64,-junix,-smalloc,-
> smalloc,-hcritbit,epoll
>
> Yes, I definitely need to get the hang of this "reading" thing.
>

It's overrated :)


>
> > I had already upgraded to 4.1.5 before mentioning the error on the list,
> and
> > it's been smooth since. It was just odd that there were no clock changes,
> > yet it panicked due to a stepping, so I figured I'd bring it up.
>
> There's a bug I don't remember and couldn't find after a quick search.
> But basically it would cause the child to not restart after a panic.
>
> Something like:
>
> - panic (child crashed)
> - restart
> - CLI timeout during restart
> - kill the child
> - varnish running without a cache process
>
> The last step is similar to the one you ran into, since you couldn't
> list backends via the CLI. But I couldn't find this bug after a quick
> search and looking at the changelog I don't see anything related. So I
> would say you may end up in the same situation even with the latest
> 4.1 release. You should collect syslogs (enabled by default) and see
> what Varnish has to say shortly before/after a panic, it might give a
> clue.
>
> Dridi
>

Thanks for the details, I'll track it down from there and keep an eye on
the issue(s). Nothing in /var/log/messages other than a ban sent ~6h prior:

Feb 12 17:09:17 aviator varnishd[15791]: CLI telnet 127.0.0.1 55284
127.0.0.1 6082 Rd auth NNN
Feb 12 17:09:17 aviator varnishd[15791]: CLI telnet 127.0.0.1 55284
127.0.0.1 6082 Wr 200 -----------------------------#012Varnish Cache CLI
1.0#012-----------------------------#012Linux,2.6.32-642.6.2.el6.x86_64,x86_64,-junix,-smalloc,-smalloc,-hcritbit#012varnish-4.1.4
revision 4529ff7#012#012Type 'help' for command list.#012Type 'quit' to
close CLI session.
Feb 12 17:09:17 aviator varnishd[15791]: CLI telnet 127.0.0.1 55284
127.0.0.1 6082 Rd ping
Feb 12 17:09:17 aviator varnishd[15791]: CLI telnet 127.0.0.1 55284
127.0.0.1 6082 Wr 200 PONG 1486912157 1.0
Feb 12 17:09:17 aviator varnishd[15791]: CLI telnet 127.0.0.1 55284
127.0.0.1 6082 Rd ban req.http.Host ~ ".*"
Feb 12 17:09:17 aviator varnishd[15791]: CLI telnet 127.0.0.1 55284
127.0.0.1 6082 Wr 200
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