netdev - Re: Asterisk deadlocks since Kernel 4.1

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Date:	Thu, 19 Nov 2015 10:49:21 +0100
From:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
To:	Florian Weimer <fweimer@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, netdev@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Asterisk deadlocks since Kernel 4.1


Am 19.11.2015 um 10:44 schrieb Florian Weimer:
> On 11/18/2015 10:36 PM, Stefan Priebe wrote:
> 
>>> please try to get a backtrace with debugging information.  It is likely
>>> that this is the make_request/__check_pf functionality in glibc, but it
>>> would be nice to get some certainty.
>>
>> sorry here it is. What I'm wondering is why is there ipv6 stuff? I don't
>> have ipv6 except for link local.
> 
> glibc needs to know if the system has global unicast addresses if it
> receives AAAA records.
> 
> It's curious that net.ipv6.conf.all.disable_ipv6=1 makes the problem go
> away.  Even with that setting, the kernel seems to send two Netlink
> responses.  So either this is enough to narrow the window for the race
> so that no longer triggers, or there is a genuine kernel issue with
> supplying the requested IPv6 Netlink response.

No idea it also goes away by downgrading to 3.18 again.

Stefan

>> Could it be this one?
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=505105#c79
> 
> No, that's on the DNS/UDP side, not in the Netlink code.
> 
> Florian
> 
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