linux-kernel - Re: [Bugme-new] [Bug 12201] New: long wait in call_usermodehelper() / queue_work() / wait_for

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Message-ID: <20081211225158.GA2169@ioremap.net>
Date:	Fri, 12 Dec 2008 01:51:58 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	mike@...ticaltech.com, bugme-daemon@...zilla.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [Bugme-new] [Bug 12201] New: long wait in call_usermodehelper() / queue_work() / wait_for_completion()

Hi.

On Thu, Dec 11, 2008 at 02:37:58PM -0800, Andrew Morton (akpm@...ux-foundation.org) wrote:
> > If I write a small pilot program that calls socket(PF_NETLINK, SOCK_RAW,
> > NETLINK_AUDIT), it will delay by 1-2 seconds 100% of the time (assuming server
> > has been online for a while).  Certain protocol types given to socket() have
> > zero delay (because no module needs to be loaded).
> > 
> > Steps to reproduce:
> > Once server has been online for a while, a simple call to socket(PF_NETLINK,
> > SOCK_RAW, NETLINK_AUDIT) shows the problem.
> 
> OK, weird.
> 
> Please get sysrq working then get us a task trace, so we can see who is
> sleeping where.  Do this:
> 
> 
> - run your "small pilot program"

Or send it to us and we will quickly fix the bug :)

Thank you!

-- 
	Evgeniy Polyakov
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