netdev - Re: ipv6: tunnel: hang when destroying ipv6 tunnel

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Message-Id: <201204052334.EBI17103.OOFOSLFQJVHFtM@I-love.SAKURA.ne.jp>
Date:	Thu, 5 Apr 2012 23:34:41 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	levinsasha928@...il.com, garlick@...l.gov, ericvh@...il.com
Cc:	oleg@...hat.com, eric.dumazet@...il.com, davem@...emloft.net,
	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, davej@...hat.com,
	penguin-kernel@...ove.SAKURA.ne.jp
Subject: Re: ipv6: tunnel: hang when destroying ipv6 tunnel

Tetsuo Handa wrote:
> Good. -512 is -ERESTARTSYS, and this hang occurs after -ERESTARTSYS is
> returned. It indicates that c->trans_mod->request() is interrupted by signal.
> Since c->trans_mod->request is pointing at p9_virtio_request, the location
> returning that error would be
(...snipped...)
> 281                         err = wait_event_interruptible(*chan->vc_wq,
> 282                                                         chan->ring_bufs_avail);
> 
>    here.

Oops. Not p9_virtio_request().

It is p9_client_rpc(). I misread the output lines.

> > > +	printk("%u:req->status = %u\n", current->pid, req->status);
> > >  	err = wait_event_interruptible(*req->wq,
> > >  				       req->status >= REQ_STATUS_RCVD);
> > > +	printk("%u:wait = %d\n", current->pid, err);

But anyway, I think this is interupt related bug.
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