directory listing hangs in "ufs" state

Andrey Zonov andrey at
Wed Dec 14 18:11:51 UTC 2011

Hi Jeremy,

This is not hardware problem, I've already checked that. I also ran fsck 
today and got no errors.

After some more exploration of how mongodb works, I found that then 
listing hangs, one of mongodb thread is in "biowr" state for a long 
time. It periodically calls msync(MS_SYNC) accordingly to ktrace out.

If I'll remove msync() calls from mongodb, how often data will be sync 
by OS?

Andrey Zonov

On 14.12.2011 2:15, Jeremy Chadwick wrote:
> On Wed, Dec 14, 2011 at 01:11:19AM +0400, Andrey Zonov wrote:
>> Have you any ideas what is going on? or how to catch the problem?
> Assuming this isn't a file on the root filesystem, try booting the
> machine in single-user mode and using "fsck -f" on the filesystem in
> question.
> Can you verify there's no problems with the disk this file lives on as
> well (smartctl -a /dev/disk)?  I'm doubting this is the problem, but
> thought I'd mention it.

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