Re: BUG: soft lockup detected on CPU#0! (linux-2.6.14)

[Neil Brown]

On Sunday November 6, maan@xxxxxxxxxxxxxxx wrote:
> Hi
> 
> I regularly get these on the current 2.6.14 kernel under heavy load.
> Backtrace differs, but nfsd is always involved:
> 
> Nov  4 12:46:44 p133 kernel: BUG: soft lockup detected on CPU#0!

This seems to suggest that the nfsd thread is always runnable, which
implies a read-only load with everything in cache - at least for the
10 seconds leading up to each of these errors.  Is that likely?

The following patch might fix it.  Please let me know the result.

Thanks,
NeilBrown


Signed-off-by: Neil Brown <neilb@xxxxxxx>

### Diffstat output
 ./net/sunrpc/svcsock.c |    1 +
 1 file changed, 1 insertion(+)

diff ./net/sunrpc/svcsock.c~current~ ./net/sunrpc/svcsock.c
--- ./net/sunrpc/svcsock.c~current~	2005-11-07 08:53:40.000000000 +1100
+++ ./net/sunrpc/svcsock.c	2005-11-07 08:53:48.000000000 +1100
@@ -1181,6 +1181,7 @@ svc_recv(struct svc_serv *serv, struct s
 	arg->tail[0].iov_len = 0;
 
 	try_to_freeze();
+	cond_resched();
 	if (signalled())
 		return -EINTR;
 
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