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lowntfs hangs on heavy disk i/o 
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Joined: Tue Feb 22, 2011 21:30
Posts: 13
Post lowntfs hangs on heavy disk i/o
Hi NTFS-3G team.

For the last two weeks or so, we have been trying to nail down a bug which is narrowed down to lowntfs-3g or fuse. I was hoping you could either validate this or point us in another direction.

We run lowntfs-3g version 2011.4.12AR.3 on debian squeeze. We use it to mount a Windows 7 NTFS drive and then we go through and calculate the md5 hash many files on the drive. Our code is literally 10 lines, and it does this very fast. In the process of iterating through the filesystem, we find that sometimes our simple code will freeze around 1 out of every 6 times on certain systems. It never hangs at the same point.

We ran hardware diagnostics on all hanging systems, and nothing stands out as corrupt or broken.

After the last observed hang, here is what we see in the logs related to ntfs/fuse (nothing really stands out otherwise):

# egrep -i 'fuse|ntfs' /var/log/*

(see attached results file)

Thanks for any hints you can give us.

-dave


Sun Jul 17, 2011 07:03
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NTFS-3G Lead Developer

Joined: Tue Sep 04, 2007 17:22
Posts: 1133
Post Re: lowntfs hangs on heavy disk i/o
Hi,

Quote:
# egrep -i 'fuse|ntfs' /var/log/*
(see attached results file)

You apparently forgot to post the attachment (note : this forum only accepts compressed attachments, so gzip it).
Quote:
Thanks for any hints you can give us.

Some clue might be provided by the state of the lowntfs-3g process when it freezes :
Code:
top -p <pid>

where <pid> is the process id of lowntfs-3g, which you can get from :
Code:
ps -eaf | grep lowntfs-3g


Regards

Jean-Pierre


Tue Jul 19, 2011 18:17
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NTFS-3G Lead Developer

Joined: Tue Sep 04, 2007 17:22
Posts: 1133
Post Re: lowntfs hangs on heavy disk i/o
Hi,

Quote:
In the process of iterating through the filesystem, we find that sometimes our simple code will freeze around 1 out of every 6 times on certain systems. It never hangs at the same point.

What kernel version are you using ? A patch was applied to fuse kernel module 2.6.35 for a similar behavior : http://www.serverphorums.com/read.php?12,296094

Regards

Jean-Pierre


Wed Jul 20, 2011 11:46
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Joined: Tue Feb 22, 2011 21:30
Posts: 13
Post Re: lowntfs hangs on heavy disk i/o
Hi Jean-Pierre,

Thanks for your helpful advice. We are running kernel 2.6.39.

We will recreate the freeze and attach more debug output (in compressed format)

More details to come.

-dave


Thu Jul 21, 2011 16:17
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