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[Qemu-devel] qemu-ga: qemu-ga will be blocked when works with vss in win


From: wenjian zhou
Subject: [Qemu-devel] qemu-ga: qemu-ga will be blocked when works with vss in windows sometimes
Date: Fri, 24 Feb 2017 00:07:37 +0800

Hello all,

Recently, I have been doing some tests with commond:guest-fsfreeze-freeze.
I found if the commond is sent to qemu-ga when copying a large file in a
windows guest,
qemu-ga may lose response.

According to some basic research, I noted it is always blocked by the
following code.
in ./qga/vss-win32/requester.cpp:

void requester_freeze(int *num_vols, ErrorSet *errset)
<cut>
out:
    if (vss_ctx.pVssbc) {
        vss_ctx.pVssbc->AbortBackup();                      <-------- never
return
    }
    requester_cleanup();
    CoUninitialize();
<cut>

So I wonder how to fix it.
Can we just remove this line?
Without it, it seems that everything is going well.
I'm so appreciated if someone can help me.

--
Thanks
Zhou


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