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On 2015-10-08T08:09:36+00:00 Richard wrote:

Description of problem:

This has similarities to the following bug, but is much rarer:
https://bugzilla.redhat.com/show_bug.cgi?id=1194366

I have a script which boots a guest 1000 times on the Fedora/aarch64
host.  Guest and host kernels are identical (4.2.0-1.fc24.aarch64).

About 5 in every 1000 boots fail.  The host kernel prints:

kvm [3683]: load/store instruction decoding not implemented

The corresponding qemu process hangs after printing:

error: kvm run failed Function not implemented
PC=000000006bbfd238  SP=00000000700000b0
X00=aa1903e1aa0303e2 X01=0000000068e67b40 X02=000000006baa7cec 
X03=0000000000e68200
X04=000000006bac1398 X05=00000000009ffaf8 X06=0000000000000000 
X07=000000006f04c85c
X08=000000006f04cb78 X09=0000000000000000 X10=0000000000000004 
X11=0000000000000000
X12=00000000700fe0fa X13=0000000000000000 X14=0000000000000000 
X15=0000000000000000
X16=000000006f04cdf0 X17=0000000000000000 X18=0000000000000000 
X19=000000006bff0018
X20=0000000000000000 X21=0000000000000000 X22=0000000000000000 
X23=0000000000000000
X24=0000000000000000 X25=0000000000000000 X26=0000000000000000 
X27=0000000000000000
X28=0000000000000000 X29=0000000000000000 X30=0000000000000000 PSTATE=60000305 
(flags -ZC-)

The PC address does not correspond to any kernel address.

Version-Release number of selected component (if applicable):

kernel 4.2.0-1.fc24.aarch64

How reproducible:

Rare, approximately 1 in 200 boots.

Steps to Reproduce:
1. In the libguestfs test suite, run:
   ./tests/qemu/qemu-boot -n 1000

Additional info:

The error message usually indicates that the guest has jumped into
random code.

I'm still investigating this bug, will update this bug with further details
as I collect it.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1646801/comments/0

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On 2015-10-08T14:39:49+00:00 Richard wrote:

Created attachment 1081033
serial port log from guest

Even though this is Fedora, I'm using AAVMF
(AAVMF-20141113-5.git77d5dac.aa7a.aarch64).  It appears to
be crashing in AAVMF.

Attached is the guest serial port log up to the point where
the guest stops.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1646801/comments/1

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On 2015-10-08T14:40:50+00:00 Richard wrote:

Created attachment 1081034
libvirt/qemu log from guest

This is the libvirt/qemu log from the same guest as in comment 1.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1646801/comments/2

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On 2015-10-08T15:43:19+00:00 Richard wrote:

As this works with Gerd's edk2.git/aarch64 package, I'm going
to say this was because I was using a too old version of AAVMF,
so it's likely not a bug.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1646801/comments/3


** Changed in: fedora
       Status: Unknown => Invalid

** Changed in: fedora
   Importance: Unknown => Undecided

** Bug watch added: Red Hat Bugzilla #1194366
   https://bugzilla.redhat.com/show_bug.cgi?id=1194366

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Title:
  [arm64] kvm run failed Function not implemented

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