Re: linux-next NFSD: NULL pointer dereference at nfsd_svc()

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J. Bruce Fields wrote:
> Maybe figuring out exactly hwere that is would help work out what's
> going on.  Doing
> 
> 	make net/sunrpc/svc.lst
> 
> then looking for c1356dd4 (or just mailing me svc.lst) could help.

"make net/sunrpc/svc.lst" failed due to following error.

  BFD: Dwarf Error: Abbrev offset (3238007024) greater than or equal to .debug_abbrev size (1607).

Manual printk() debug reported that
rqstp->rq_argp == rqstp->rq_resp == ZERO_SIZE_PTR and
procp->pc_argsize == procp->pc_ressize == 4.

--- linux-2.6.35-next.orig/net/sunrpc/svc.c
+++ linux-2.6.35-next/net/sunrpc/svc.c
@@ -1084,6 +1084,11 @@ svc_process_common(struct svc_rqst *rqst
 	procp->pc_count++;

 	/* Initialize storage for argp and resp */
+	printk(KERN_INFO "rqstp=%p procp=%p\n", rqstp, procp);
+	printk(KERN_INFO "rqstp->rq_argp=%p procp->pc_argsize=%u\n",
+	       rqstp->rq_argp, procp->pc_argsize);
+	printk(KERN_INFO "rqstp->rq_resp=%p procp->pc_ressize=%u\n",
+	       rqstp->rq_resp, procp->pc_ressize);
 	memset(rqstp->rq_argp, 0, procp->pc_argsize);
 	memset(rqstp->rq_resp, 0, procp->pc_ressize);
 

[   37.669174] NET: Registered protocol family 10
[   38.080725] svc: failed to register lockdv1 RPC service (errno 97).
[  122.895707] rqstp=dcb91000 procp=c154ca20
[  122.896533] rqstp->rq_argp=00000010 procp->pc_argsize=4
[  122.897484] rqstp->rq_resp=00000010 procp->pc_ressize=4
[  122.898609] BUG: unable to handle kernel NULL pointer dereference at 00000010
[  122.899964] IP: [<c1356e80>] svc_process_common+0x370/0x640
[  122.900493] *pde = 00000000 
[  122.900493] Oops: 0002 [#1] SMP DEBUG_PAGEALLOC
[  122.923308] last sysfs file: /sys/devices/pci0000:00/0000:00:10.0/host0/target0:0:1/0:0:1:0/type
[  122.923308] Modules linked in: nfs ipv6 pcnet32

> OK, I wonder if Sarge didn't yet mount the nfsd filesystem on
> /proc/fs/nfsd.

According to /proc/mounts , the nfsd filesystem is not mounted on
/proc/fs/nfsd . But mounting it manually before starting nfsd did not help.

Regards.
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