Red Hat Bugzilla – Bug 236439
Illegal instruction etc. in fully-virtualized guest
Last modified: 2009-06-19 12:41:01 EDT
Description of problem:
Fully-virtualized guest (HVM) is exhibiting odd behavior. The following has
-"illegal instruction" when trying to unmount a filesystem
-"illegal instruction" when trying to run a setup script
-Build of a test fail because a header file was not available - the directory
was not readable.
-Not being able to write to a file.
The problem does not occur consistently. Rebooting the guest may make the
problem go away.
Version-Release number of selected component (if applicable):
Medium. Sometimes I see one problem, the afte reboot it may be gone. Another
may manifest itself
Steps to Reproduce:
1. Install a fully-virtualized guest
2. Use it to do things
Odd behavior at times
No odd behavior
rx6600 with 8 cores, 96GB memory.
Fully-virt guest installed to a physical drive. It had 1 vCPU and 8GB of memory.
Can you provide some info on the software versions:
- kernel-xen for the Dom0 host
- xen for the Dom0 host
- What OS is being used as the guest ?
Can you also attach the /etc/xen config file associated with the guest, and
/var/log/xen/xend.log & xend-debug.log. Finally, capture the output of 'xm
dmesg' & attach it
kernel-xen is 2.6.18-8.1.1.el5xen
I have run guest with RHEL5 2.6.18-8.el5 and 2.6.18-8.1.1.el5
I will send additional info shortly.
Created attachment 152842 [details]
Fully-virtualized guest config file
Attached is the config file for the guest.
Created attachment 153026 [details]
Attached is xend.log. Note this system has run more that just the hvm guest...
Created attachment 153027 [details]
Attached is xend-debug.log.
Created attachment 153028 [details]
xm dmesg output
Attached is 'xm dmesg' output.
Do we have a relaible method of reproducting this problem?
There were no specific set of actions I was doing on the guest running RHEL5.0
which made the issues appear. One thing to note is that the guests which
exhibited issues were 8GB or 4GB in size. I also did some "very limited" work
with a 1GB guest and did not run into the issues during the short period of time
I was working with it.
Reproducer required to confirm this issue exists in 5.1. If the above errors
are not seen in 5.1 beta testing, please close this BZ.
(In reply to comment #9)
> Reproducer required to confirm this issue exists in 5.1. If the above errors
> are not seen in 5.1 beta testing, please close this BZ.
I have rerun AIM7 with all four workloads (fserver, dbase, compute, shared) with
a 1VCPU, 8GB, 3 disk fully-virt guest; a 1VCPU, 32000MB, 3 disk FV guest; and a
4VCPU, 32000MB, 3 disk FV guest. I am no longer running into any of the
problems mentioned earlier in this bugzilla.
Guests were running RHEL5.1 Beta 1 (2.6.18-36.el5)
Dom0 was running RHEL5.1 Beta 1 (2.6.18-36.el5xen)
Xen rev is 3.1.0-36.el5
Guest FW is from xen-ia64-guest-firmware-1.0.11-1 package
Thanks for the update on your testing. Closing this BZ per Comment #10 as UPSTREAM.