Bug 820056

Summary: kvm-unit-tests: multiple nmi: FAIL
Product: Red Hat Enterprise Linux 6 Reporter: Amos Kong <akong>
Component: kernelAssignee: Gleb Natapov <gleb>
Status: CLOSED WONTFIX QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: unspecified Docs Contact:
Priority: medium    
Version: 6.3CC: ailan, areis, juzhang, knoel, michen, mtosatti, tburke
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-05-14 14:32:31 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Amos Kong 2012-05-09 02:58:35 UTC 
Description of problem:

# qemu-kvm  -nodefaults -serial stdio -vnc :0 -chardev file,id=testlog,path=/tmp/testlog-20120509-094418-65Qx -device testdev,chardev=testlog -m 512 -smp 2 -kernel 'x86/apic.flat' --enable-kvm
enabling apic
enabling apic
enabling apic
paging enabled
cr0 = 80010011
cr3 = 1ffff000
cr4 = 20
apic version: 50014
apic existence: PASS
enabling apic
x2apic not detected
self ipi: PASS
ioapic interrupt: PASS
ioapic simultaneous interrupt: PASS
nmi-after-sti: PASS
multiple nmi: FAIL
^^^^^^^^^^^^^^^^^^
tsc deadline timer not detected

summary: 6 tests, 1 failures


Version-Release number of selected component (if applicable):
# uname -r && rpm -q qemu-kvm
host kernel: 2.6.32-262.el6.x86_64
qemu-kvm-0.12.1.2-2.285.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. compile kvm-unit-tests
2. execute apic test
# qemu-kvm  -nodefaults -serial stdio -vnc :0 -chardev file,id=testlog,path=/tmp/testlog-20120509-094418-65Qx -device testdev,chardev=testlog -m 512 -smp 2 -kernel 'x86/apic.flat' --enable-kvm
  
Actual results:
multiple nmi testing failed

Expected results:
all tests pass

Additional info:
all tests pass with 3.4.0-rc4 host kernel
Comment 1 Amos Kong 2012-05-09 03:12:28 UTC 
[PATCH kvm-unit-tests] apic: test simultaneous NMIs
http://marc.info/?l=kvm&m=131609772126630&w=2
Comment 2 Dor Laor 2012-05-10 11:52:10 UTC 
Is it only the tsc deadline timer? It's not enabled for 6.3.
AFAIK we have a BZ open for 6.4 for the deadline timer
Comment 3 Amos Kong 2012-05-10 12:05:16 UTC 
(In reply to comment #2)
> Is it only the tsc deadline timer? It's not enabled for 6.3.
> AFAIK we have a BZ open for 6.4 for the deadline timer

This bug is reported for test_multiple_nmi(), not test_tsc_deadline_timer().
Comment 4 Gleb Natapov 2012-05-14 14:32:31 UTC 
(In reply to comment #0)
> Expected results:
> all tests pass

This is not expected result. kvm-unit-test suppose to work without failures only on upstream kernels. It is well known that many tests fail on rhel6, but we do not backport fixes just because unit test fail. Closing the bug. If the bug cause real problems for real guest software please provide info and reopen.
Comment 5 Gleb Natapov 2012-05-14 14:37:53 UTC 
In case we will want to fix it the upstream commit is  7460fb4a340033107530df19e7e125bd0969bfb2