Hi Salvatore, so that old crash really looks quite similar. One interesting difference is that this process did simply exit and was not killed. Which sounds, like you did suspect as well, that this is not a regression in a recent kernel but something in the way things are executed changed and makes it just happen more often now.
I hear from James Page that right now some changes in OpenStack will cause more things happen in parallel. That maybe causes some races to get triggered which haven't been observed (that often) before. To get a better understanding what the exact state of things is when this happens, would it be possible to enable crashdump on one of the development machines experiencing the issue and set it to panic on the oops? A description how to set up crashdump you would find at https://wiki.ubuntu.com/Kernel/CrashdumpRecipe. To cause the oops to become a panic you would have to echo 1 into /proc/sys/kernel/panic_on_oops after boot. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1273386 Title: Neutron namespace metadata proxy triggers kernel crash on Ubuntu 12.04/3.2 kernel Status in OpenStack Neutron (virtual network service): New Status in OpenStack Compute (Nova): New Status in “linux” package in Ubuntu: Incomplete Bug description: In the past 9 days we have been seeing very frequent occurences of this kernel crash: http://paste.openstack.org/show/61869/ Even if the particular crash pasted here is triggered by dnsmasq, in almost all cases the crash is actually triggered by the neutron metada proxy. This also affects nova badly since this issue, which appears namespace related, results in a hang while mounting the ndb device for key injection. logstash query: http://logstash.openstack.org/#eyJzZWFyY2giOiJcImtlcm5lbCBCVUcgYXQgL2J1aWxkL2J1aWxkZC9saW51eC0zLjIuMC9mcy9idWZmZXIuYzoyOTE3XCIgYW5kIGZpbGVuYW1lOnN5c2xvZy50eHQiLCJmaWVsZHMiOltdLCJvZmZzZXQiOjAsInRpbWVmcmFtZSI6ImN1c3RvbSIsImdyYXBobW9kZSI6ImNvdW50IiwidGltZSI6eyJmcm9tIjoiMjAxNC0wMS0xNlQxODo1MDo0OCswMDowMCIsInRvIjoiMjAxNC0wMS0yN1QxOToxNjoxMSswMDowMCIsInVzZXJfaW50ZXJ2YWwiOiIwIn0sInN0YW1wIjoxMzkwODUwMzI2ODY0fQ== We have seen about 398 hits since the bug started to manifest. Decreased hit rate in the past few days is due to less neutron patches being pushed. To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1273386/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp