Weird Windows Server 2012 behavior with compound requests

Jeremy Allison jra at
Mon Jan 20 19:59:35 UTC 2020

On Sun, Jan 19, 2020 at 08:29:19PM -0800, Richard Sharpe via samba-technical wrote:
> Hi folks,
> I am seeing what looks like weird behavior with Windows Server 2012.
> I am sending it a long series of compound request with:
> 1. CREATE <some-file> with OPEN for backup intent, READ CONTROL.
> 2. GET INFO for the SD.
> 3. CLOSE.
> Early on the server give me lots of credits (around 35) but eventually
> it scales that back to just three credits per request.
> I never send a request unless I have credits, I believe.
> Every now and then the server fails all of the requests in the
> compound with ACCESS_DENIED (which seems wrong, because I would only
> expect the CREATE to get ACCESS_DENIED and the other two to get
> FILE_ALREADY_CLOSED or some such.)
> If I restart the operation where it left off, everything runs to completion.
> I must admit that I was doing reboot testing where I reboot the
> Windows server to ensure that the whole operation picked up where it
> left off. I have ~40,000 files in my test set, and if I don't do any
> reboots, it runs to completion.
> However, if I throw a couple of reboots into the mix I see the above behavior.
> Has anyone seen this sort of behavior. Is there anything I should look for?

Get a wireshark trace, maybe report it to Microsoft doc-help.

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