On Tue, Aug 03, 2010 at 11:48:51AM -0400, J. Bruce Fields wrote:
> On Tue, Aug 03, 2010 at 10:09:03AM +0900, Tetsuo Handa wrote:
> > Hello.
> >
> > That patch solved the NULL pointer dereference problem. Thank you.
> >
> > But I got another problem. After applying that patch on 2.6.35-next-20100802 ,
> > mount operation fails with timeout error.
>
> Argh, yes, problem found, I think--I'll do some more testing and send
> you another attempt....
How about this?
(By the way, are you using something other than the standard
/etc/init.d/nfs-kernel-server to start/stop the server? Or have you
customized your installation in any way? Just curious, as the bugs
you're finding are good, but I'd expect different symptoms from the
default setup.)
--b.
commit 3deb279d6e5625407919a875db3a2461199566b3
Author: J. Bruce Fields <bfields@xxxxxxxxxx>
Date: Mon Aug 2 14:12:44 2010 -0400
nfsd: fix startup/shutdown order bug
We must create the server before we can call init_socks or check the
number of threads.
Symptoms were a NULL pointer dereference in nfsd_svc(). Problem
identified by Jeff Layton.
Reported-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 92173bd..58e3d4c 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -420,7 +420,7 @@ int
nfsd_svc(unsigned short port, int nrservs)
{
int error;
- bool first_thread;
+ bool unstarted, first_thread;
mutex_lock(&nfsd_mutex);
dprintk("nfsd: creating service\n");
@@ -432,29 +432,31 @@ nfsd_svc(unsigned short port, int nrservs)
if (nrservs == 0 && nfsd_serv == NULL)
goto out;
- first_thread = (nfsd_serv->sv_nrthreads == 0) && (nrservs != 0);
+ unstarted = nfsd_serv == NULL || nfsd_serv->sv_nrthreads == 0;
+ first_thread = unstarted && (nrservs != 0);
+
+ error = nfsd_create_serv();
+ if (error)
+ goto out;
if (first_thread) {
error = nfsd_startup(port, nrservs);
if (error)
- goto out;
+ goto out_destroy;
}
- error = nfsd_create_serv();
- if (error)
- goto out_shutdown;
error = svc_set_num_threads(nfsd_serv, NULL, nrservs);
if (error)
- goto out_destroy;
+ goto out_shutdown;
/* We are holding a reference to nfsd_serv which
* we don't want to count in the return value,
* so subtract 1
*/
error = nfsd_serv->sv_nrthreads - 1;
-out_destroy:
- svc_destroy(nfsd_serv); /* Release server */
out_shutdown:
if (error < 0 && first_thread)
nfsd_shutdown();
+out_destroy:
+ svc_destroy(nfsd_serv); /* Release server */
out:
mutex_unlock(&nfsd_mutex);
return error;
--
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