kvm deadlock

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Hello,

I am struggling with repeatable full hardware locks when running 8-12 KVM vms. At some point before the hard lock I get a inconsistent lock state warning. An example of this can be found here:

http://pastebin.com/8wKhgE2C

After that the server continues to run for a while and then starts its death spiral. When it reaches that point it fails to log anything further to the disk, but by attaching a console I have been able to get a stack trace documenting the final implosion:

http://pastebin.com/PbcN76bd

All of the cores end up hung and the server stops responding to all input, including SysRq commands. 

I have seen this behavior on two machines (dual E5606 running Fedora 16) both passed cpuburnin testing and memtest86 scans without error. 

I have reproduced the crash and stack traces from a Fedora debugging kernel - 3.1.2-1 and with a vanilla 3.1.4 kernel.

Nate Custer
QA Analyst
cPanel Inc--
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