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(In reply to CongLi from comment #1)
> Created attachment 815994[details]
> all screenshot
Attached all screenshots, can get installation info from it. I hope it will be helpful.
Comment 4Yvugenfi@redhat.com
2013-10-31 15:29:46 UTC
Are you able to boot into the guest? If yes, please provide compressed dump file (mini dump?).
Thanks,
Yan.
(In reply to Yan Vugenfirer from comment #4)
> Are you able to boot into the guest? If yes, please provide compressed dump
> file (mini dump?).
Hi Yan,
I can't reproduce this bug on the following version on the same machine:
qemu-kvm-1.5.3-50.el7.x86_64
kernel-3.10.0-97.el7.x86_64
And I have downgraded qemu and kernel to the version in comment 0, this bug can be reproduced.
kernel-3.10.0-35.el7.x86_64
qemu-kvm-1.5.3-10.el7.x86_64
If hit this again, I will update it.
Thanks,
Cong
Comment 7Yvugenfi@redhat.com
2014-02-27 11:24:20 UTC
Here are the test results with more bisection:
1. kernel-3.10.0-44.el7.x86_64 --> pass
qemu-kvm-1.5.3-15.el7.x86_64
2. kernel-3.10.0-44.el7.x86_64 --> pass
qemu-kvm-1.5.3-14.el7.x86_64
4. kernel-3.10.0-43.el7.x86_64 --> pass
qemu-kvm-1.5.3-15.el7.x86_64
4. kernel-3.10.0-43.el7.x86_64 --> fail
qemu-kvm-1.5.3-14.el7.x86_64
This bug seems both kernel and qemu related, for need to downgrade both of them can reproduce it.
Thanks,
Cong
(In reply to CongLi from comment #8)
> Here are the test results with more bisection:
>
> 1. kernel-3.10.0-44.el7.x86_64 --> pass
> qemu-kvm-1.5.3-15.el7.x86_64
>
> 2. kernel-3.10.0-44.el7.x86_64 --> pass
> qemu-kvm-1.5.3-14.el7.x86_64
>
> 4. kernel-3.10.0-43.el7.x86_64 --> pass
> qemu-kvm-1.5.3-15.el7.x86_64
>
> 4. kernel-3.10.0-43.el7.x86_64 --> fail
> qemu-kvm-1.5.3-14.el7.x86_64
>
>
> This bug seems both kernel and qemu related, for need to downgrade both of
> them can reproduce it.
The problem is -cpu 'Opteron_G4'.
1. 'Opteron_G2' --> pass
2. 'Opteron_G3' --> pass
3. 'Opteron_G4' --> fail
4. 'Opteron_G5' --> fail
Although this bug can't be reproduced on RHEL.7 host, it's still existed on RHEL.6 host.
I don't know what's the relationship between "-cpu 'Opteron_G4'" and the fix version, I hope it's maybe helpful for the analyze on RHEL.6.
Thanks,
Cong
The bisection points towards XSAVE:
- G2 and G3 don't have CPUID_EXT_XSAVE, but G4 and G5 do
- qemu-kvm-1.5.3-15.el7 re-computes what is XSAVEd[1]
- kernel-3.10.0-44.el7 does a similar thing[2]
I don't see anything like that in RHEL6, so a backport should fix this issue there as well.
---
1: [2/2] 1a92e9b x86: cpuid: reconstruct leaf 0Dh data
2: [1/5] 0163873 [virt] kvm: mask unsupported XSAVE entries from leaf 0Dh index 0
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