Hello,
When I start multi VMs coincidently and any of the cgroup directories
named machine doesn't exist. There's a chance that VM start failed. And
the errors reported are:
1. Unable to initialize /machine cgroup: File exists
2. Unable to create cgroup for sit_vm_16: No such file or directory
So I analyze it and find that:
If thread A and thread B start VMs at the same time, there's a chance that, thread A creat
directory failed and thread B succeed. Then thread A will clean up machine directory, and
thread B will do something in the machine directory cleaned up by thread A. At last thread B
failed too because it can't find the directory.
Thread A reports error 1 and thread B reports error 2.
Well, the true reason is that the judgement of dirctory existence and the operation of creating
directory is not atomic. At first, I want to find a lock to fix it, but failed. Then I apply a patch to
get the EEXIST through to fix it.
Guys, any better idea?
My best regards
WangYufei
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