** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1647400
Title:
system freeze when swapping to encrypted swap partition
Status in Ubuntu on IBM z Systems:
In Progress
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
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