This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed- xenial'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-xenial -- 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/1647400 Title: system freeze when swapping to encrypted swap partition Status in Ubuntu on IBM z Systems: Fix Committed Status in linux package in Ubuntu: In Progress Status in linux source package in Xenial: Fix Committed Bug description: == Comment: #0 - Bernd-Rainer Bresser <bress...@de.ibm.com> - 2016-12-05 04:27:00 == +++ This bug was initially created as a clone of Bug #147836 +++ ---Problem Description--- When the system is installed with encrypted swap partition the attempt to swap ends in a system freeze. No error, no dump, the system needs to be reloaded. Contact Information = Bernd-Rainer Bresser/Germany/IBM, Wen Yi AG Gao/China/IBM ---uname output--- Linux s38lp65 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:05:09 UTC 2016 s390x s390x s390x GNU/Linux Machine Type = z13 LPAR ---System Hang--- System is frozen. No error, no dump, the system needs to be reloaded. ---Debugger--- A debugger is not configured ---Steps to Reproduce--- 1. install a system with encrypted swap partition. This can be done using the installer or via manual updates to /etc/fstab and /etc/crypttab. 2. Verify encrypted swap partition exists cryptsetup status kvmibm-swap /dev/mapper/kvmibm-swap is active and is in use. type: PLAIN cipher: aes-xts-plain64:sha256 keysize: 256 bits device: /dev/dasda2 offset: 0 sectors size: 8388672 sectors mode: read/write 3. force swapping this can be done by a command like this (if the system has 8GB memory) dd if=/dev/zero of=/dev/null ibs=16k obs=8G count=2MB Stack trace output: no Oops output: no System Dump Location: *Additional Instructions for Bernd-Rainer Bresser/Germany/IBM, Wen Yi AG Gao/China/IBM: -Attach sysctl -a output output to the bug. == Comment: #1 - Bernd-Rainer Bresser <bress...@de.ibm.com> - 2016-12-05 04:33:24 == - the problem was originally found on KVM for IBM z 1.1.3 - test on Ubuntu 16.04.1 showed the same issue here - on KVM for IBM z 1.1.3 the problem could be solved/circumvented by reverting commit 564e81a57f9788b1475127012e0fd44e9049e342 Author: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp> Date: Fri Feb 5 15:36:30 2016 -0800 mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any progress To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1647400/+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