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Date: Thu, 17 Jan 2013 19:35:22 -0500
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To: The Cygwin Mailing List <cygwin AT cygwin DOT com>,
        Chris Sutcliffe <ir0nh34d AT gmail DOT com>
Subject: Re: rtorrent and recent snapshots - apparent problem with msync()
Message-ID: <20130118003522.GA1913@ednor.casa.cgf.cx>
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Mail-Followup-To: The Cygwin Mailing List <cygwin AT cygwin DOT com>,	Chris Sutcliffe <ir0nh34d AT gmail DOT com>
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On Thu, Jan 17, 2013 at 04:42:36PM -0500, Chris Sutcliffe wrote:
>On 17 January 2013 06:55, Chris Sutcliffe wrote:
>> On 17 January 2013 01:24, Christopher Faylor wrote:
>>> Is there a stackdump file?  If not, I guess if you could make a strace
>>> available for download that could be useful.
>>
>> The current snapshots do not produce a stackdump.  I will execute an
>> strace this evening when I get home and provide it.
>
>I've uploaded the strace for this issue here:
>
>http://dl.dropbox.com/u/5530441/cygwin/rtorrent.strace
>
>Please let me know if there is anything else I can do to help.

Thanks.  That helped.

msync() is failing with an EACCESS errno.  That translates to a windows
error: ERROR_LOCK_VIOLATION.  According to the ancient wisdom of google,
it is not uncommon for the FlushViewOfFile() function to return with
this error in some cases.

I added a retry to the function fhandler_disk_file::msync and tried
running rtorrent to download a debian iso (which seemed to be what you
were doing).  I could duplicate your problem before adding the retry but
I don't see it now.

The command I was using:

rtorrent http://cdimage.debian.org/debian-cd/6.0.6/i386/bt-cd/debian-6.0.6-i386-CD-1.iso.torrent

I'm generating a snapshot now.  Please give it a try when it shows up.

And, Corinna, please if the change I made to your function is wrong or
you just don't like my variable names or comments please feel free to
expunge what I did with extreme prejudice.

I can't explain what in the newer snapshots would cause a difference
in behavior other than the fact that they were being built with a
newer compiler and a revamped configure script.

cgf

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