linux-kernel - Re: [PATCH] NFS: Fix infinite loop in gss_create

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Message-ID: <4DA4946D.5020403@suse.cz>
Date:	Tue, 12 Apr 2011 20:05:33 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Bryan Schumaker <bjschuma@...app.com>
CC:	Jiri Slaby <jirislaby@...il.com>,
	"Myklebust, Trond" <Trond.Myklebust@...app.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mm-commits@...r.kernel.org, ML netdev <netdev@...r.kernel.org>,
	linux-nfs@...r.kernel.org
Subject: Re: [PATCH] NFS: Fix infinite loop in gss_create_upcall()

On 04/12/2011 07:41 PM, Bryan Schumaker wrote:
> On 04/11/2011 05:08 PM, Jiri Slaby wrote:
>>
>> Sorry for an extra message. I've just found out that there appears
>> messages in dmesg:
>> [   58.656048] RPC: AUTH_GSS upcall timed out.
>> [   58.656050] Please check user daemon is running.
>> [   88.656065] RPC: AUTH_GSS upcall timed out.
>> [   88.656068] Please check user daemon is running.
>> [  118.656077] RPC: AUTH_GSS upcall timed out.
>> [  118.656080] Please check user daemon is running.
>> [  148.656049] RPC: AUTH_GSS upcall timed out.
>> [  148.656052] Please check user daemon is running.
>> [  178.656046] RPC: AUTH_GSS upcall timed out.
>> [  178.656049] Please check user daemon is running.
>>
>>
>> I instrumented the code and it's stuck with trying RPC_AUTH_GSS_KRB5.
>>
>> I don't use GSS at all.
>>
>> regards,
> 
> Does this patch help?
> 
> - Bryan
> 
> 
> 
> There can be an infinite loop if gss_create_upcall() is called without
> the userspace program running.  To prevent this, we return -EACCES if
> we notice that pipe_version hasn't changed (indicating that the pipe
> has not been opened).

Yes, it fixes the problem. But it waits 15s before it times out. This is
inacceptable for automounted NFS dirs.

thanks,
-- 
js
suse labs
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