linux-kernel - Re: BUG at net/sunrpc/svc

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Message-ID: <20130208205844.GD21040@fieldses.org>
Date:	Fri, 8 Feb 2013 15:58:45 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Tom Horsley <horsley1953@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: BUG  at net/sunrpc/svc_xprt.c:921

On Thu, Feb 07, 2013 at 07:56:51AM -0500, Tom Horsley wrote:
> I noticed some previous messages with this subject, but the
> walkback I'm getting doesn't match exactly the ones shown
> in the threads I saw, so I figured I'd send this in.
> 
> This happens on both my Fedora 18 and Fedora 17 partitions
> when mounting filesystems from very old servers that
> need the proto=udp option to talk.
> 
> The redhat bugzilla is here:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=908451
> 
> There is a photo of the walkback in that bugzilla:
> 
> svc_delete_xprt+0x12a
> svc_recv+0x101
> ? nfs_callback_authenticate+0x50
> nfs4_callback_svc+0x3b
> kthread+0xc0
> ? ftrace_raw_event_xen_mmu_flush_tlb_others+0x50
> ? kthread_create_on_node+0x120
> ret_from_fork+0x7c
> ? kthread_create_on_node+0x120

OK, yes this is the

	if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags))
	      BUG();

in svc_delete_xprt() and is a known (but unfixed) problem.  Stanislav
has some patches, that should be fixed soon....

--b.
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