linux-kernel - Re: Regression, bisected: sqlite locking failure on nfs

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Date:	Mon, 1 Nov 2010 14:30:03 -0400
From:	Chuck Lever <chuck.lever@...cle.com>
To:	Nick Bowler <nbowler@...iptictech.com>
Cc:	LKML Kernel <linux-kernel@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...hat.com>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: Regression, bisected: sqlite locking failure on nfs


On Nov 1, 2010, at 2:19 PM, Nick Bowler wrote:

> On 2010-11-01 14:07 -0400, Chuck Lever wrote:
>> On Nov 1, 2010, at 1:58 PM, Nick Bowler wrote:
>>> After installing 2.6.37-rc1, attempting to use sqlite in any capacity on
>>> NFS gives a locking error:
>>> 
>>> % echo 'select * from blah;' | sqlite3 blah.sqlite
>>> Error: near line 1: database is locked
>>> 
>>> % echo 'create table blargh(INT);' | sqlite3 blargh.sqlite
>>> Error: near line 1: database is locked
>>> 
>>> The result is that a lot of high-profile applications which make use of
>>> sqlite fail mysteriously.  Bisection reveals the following, and
>>> reverting the implicated commit solves the issue:
>> 
>> Nick, thanks for the report.  Is 2.6.37-rc1 running on your clients or
>> on your server?
> 
> Sorry for not being clear: the client is running 2.6.37-rc1.   The
> server is running RHEL 5.5.
> 
>> Does anything interesting appear in the kernel log when your test case
>> fails?
> 
> There are no unusual messages on the client... but I just logged into
> the server and I see lots of messages of the following form:
> 
>  nfsd: request from insecure port (192.168.8.199:35766)!
>  nfsd: request from insecure port (192.168.8.199:35766)!
>  nfsd: request from insecure port (192.168.8.199:35766)!
>  nfsd: request from insecure port (192.168.8.199:35766)!
>  nfsd: request from insecure port (192.168.8.199:35766)!
> 
> (192.168.8.199 is the address of the failing client).  I can only assume
> that these are a result of my recent issues, since I don't have access
> to the system log (with timestamps) on that machine.

That's the problem this patch is supposed to prevent.  I'll investigate further.

-- 
Chuck Lever
chuck[dot]lever[at]oracle[dot]com




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