Public bug reported: Hi,
Some of our nova compute hosts regularly freeze, sometimes for a few hours, with kern.log getting spammed with : block nbdX: Attempted send on closed socket and a few "CPU soft lockup" messages (see attached log). This clears up when the queue gets cleared, eg : block nbdX: queue cleared trusty hosts with kernel version 3.19.0-30-generic. Note that timestamps from kern.log appears to be wrong, it looks like the messages are being held, and then all delivered at once when the kernel unfreezes. Attaching apport files from 2 hosts below. ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- 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/1505564 Title: Soft lockup with "block nbdX: Attempted send on closed socket" spam Status in linux package in Ubuntu: New Bug description: Hi, Some of our nova compute hosts regularly freeze, sometimes for a few hours, with kern.log getting spammed with : block nbdX: Attempted send on closed socket and a few "CPU soft lockup" messages (see attached log). This clears up when the queue gets cleared, eg : block nbdX: queue cleared trusty hosts with kernel version 3.19.0-30-generic. Note that timestamps from kern.log appears to be wrong, it looks like the messages are being held, and then all delivered at once when the kernel unfreezes. Attaching apport files from 2 hosts below. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1505564/+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