Re: BUG at net/sunrpc/svc_xprt.c:921

From: J. Bruce Fields
Date: Fri Feb 08 2013 - 15:58:50 EST

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:
> 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))

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

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