[squid-users] pinger crash - Bad opcode: 112

[Tomas Mozes]

On Wed, Jun 1, 2016 at 1:53 PM, Amos Jeffries <squid3 at treenet.co.nz> wrote:

> On 31/05/2016 9:56 p.m., Tomas Mozes wrote:
> > On Thu, May 26, 2016 at 8:04 AM, Amos Jeffries wrote:
> >
> >> On 24/05/2016 7:52 p.m., Tomas Mozes wrote:
> >>> Hello,
> >>> on two different squid servers I've observed a crash of pinger. First
> it
> >>> appeared on version 3.5.15 and later on version 3.5.17.
> >>>
> >>> Cache.log contains these lines:
> >>>
> >>> (pinger): Address.cc:671: void Ip::Address::getAddrInfo(addrinfo*&,
> int)
> >>> const: Assertion `false' failed.
> >>> 2016/05/14 21:55:25 kid1| Bad opcode: 112 from
> >>> [6661:6c73:6522:2061:7420:6c69:6e65:2036]
> >>> 2016/05/14 21:59:13 kid1| recv: (111) Connection refused
> >>> 2016/05/14 21:59:13 kid1| Closing Pinger socket on FD 17
> >>>
> >>> On both servers, that IPv6 address was the same -
> >>> 6661:6c73:6522:2061:7420:6c69:6e65:2036
> >>>
> >>
> >> That is the hexadecimal representation of the error:
> >>  false" at line 6
> >>
> >> Which means that your kernel is producing garbage when asked to resolve
> >> an IPv6 address or respond to an ICMPv6 packet.
> >>
> >
> > Cannot we prevent Squid from crashing in these cases?
> >
>
> Squid is not crashing. The pinger is. Squid continues with degraded
> service latency.
>

Yes, sorry, I wasn't specific. I meant like some part of Squid, not the
Squid caching process itself.


> What kind of continued operations would you expect a program to do when
> it discovers at least some portion of its RAM has been filled with
> garbage by the system kernel?
>


In the worst case - wouldn't it be possible for the master process to
restart it?



>
> Now cross your fingers and pray that no other programs on your whole
> system (network, if you did the same "disable" on other machines) are
> behaving badly in secret when given the garbage by the kernel like
> Squid's pinger was.
>

You know, the strange thing is I only found those strings on google
attached with Squid. No other place. If it's a general issue in the Linux
kernel, then it's been there for years, unnoticed. And as I mentioned
before, it happened on two machines, separate from each other, in
completely different data-centers with the same error message.

What would you suggest?



>
> Amos
>
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