[ovs-discuss] SIGSEGV in nl_attr_get_size() - OVS 2.0.2

James Page james.page at ubuntu.com
Thu Jan 8 21:15:17 UTC 2015


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Hi Ben

On 07/01/15 16:18, Ben Pfaff wrote:
> Thanks.  In the past I've tried but I've been unable to track down
> the root cause.  I also suspected some kind of compiler bug or
> strange interaction.

I've still not determined whether this is an optimizer issue, but we
have now seen this problem across all 6 server in our Ubuntu QA cloud;
this appears to be a problem that builds up over time - the tenant
that sees this first is our automated testing account which
creates/deletes alot of instances over time.

Across all nodes I see:

2015-01-08T13:36:07.822Z|80336|dpif|WARN|system at ovs-system: failed to
flow_del (No such file or directory)
skb_priority(0),in_port(4),skb_mark(0),eth(src=ae:c4:93:ba:85:3e,dst=33:33:ff:5f:c4:32),eth_type(0x86dd),ipv6(src=::,dst=ff02::1:ff5f:c432,label=0,proto=58,tclass=0,hlimit=255,frag=no),icmpv6(type=135,code=0),nd(target=fe80::8412:d1ff:fe5f:c432)

message alot; which is related to
https://github.com/openvswitch/ovs/commit/3601bd879 which we don't
have in the 3.13 kernel for trusty.

I'm wondering whether this is related - the stacktrace relates to flow
misses and has a large parameter list in the handle_flow_misses call.

The optimized code may just be obfuscating the actual problem.

- -- 
James Page
Ubuntu and Debian Developer
james.page at ubuntu.com
jamespage at debian.org
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