** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1896726
Title:
[UBUNTU 20.04.1]Secure guest (qemu) crash during boot (mostly) but
also while running workload (rare) (secure execution)
Status in Ubuntu on IBM z Systems:
New
Status in linux package in Ubuntu:
New
Bug description:
Secure Execution with Ubuntu 20.04, secure guest crash during boot
from time to time, crashed guest went into Shufoff state instead of
Crashed state (<on_crash>preserve is set), so I can't get a dump.
libvirt log file:
2020-04-21T16:35:39.382999Z qemu-system-s390x: Guest says index 19608 is
available
2020-04-21 16:35:44.831+0000: shutting down, reason=crashed
---uname output---
Linux ubu204uclg1002 5.4.0-25-generic #29-Ubuntu SMP Fri Apr 17 15:05:32 UTC
2020 s390x s390x s390x GNU/Linux
Machine Type = z15 8561
---Debugger---
A debugger is not configured
---Steps to Reproduce---
I have a setup with 72 KVM guests which I can start in secure or non-secure
mode. Starting all of them in secure mode back to back results in a number of
guests (4..8) in Shutoff state and reason=crashed in the libvirt log. I can
manually start the guest again.... no problem. Different guests are failing.
Host and guests are on latest Ubuntu 20.04.
The supposed fix (kernel memory management) has landed in Andrew Mortons mm
tree
https://lore.kernel.org/mm-commits/20200916003608.ib4ln%25a...@linux-foundation.org/T/#u
Please note: while this was found with secure execution, the bug is
actually present for non-KVM workloads as well.
The complete patch is this:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a338e69ba37286c0fc300ab7e6fa0227e6ca68b1
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