On Sun, 28 Jan 2007 23:31:00 +0100
Michal Piotrowski [off-list ref] wrote:

Jan 28 22:58:29 euridica kernel: BUG: using smp_processor_id() in preemptible [00000001] code: yum-updatesd/2846
Jan 28 22:58:29 euridica kernel: caller is nf_conntrack_in+0x363/0x47f [nf_conntrack]

I'll plug that with this:


diff -puN include/net/netfilter/nf_conntrack.h~netfilter-warning-fix include/net/netfilter/nf_conntrack.h

--- a/include/net/netfilter/nf_conntrack.h~netfilter-warning-fix
+++ a/include/net/netfilter/nf_conntrack.h

@@ -254,7 +254,12 @@ extern atomic_t nf_conntrack_count;
 extern int nf_conntrack_max;
 
 DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
-#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
+#define NF_CT_STAT_INC(count)						\
+	do {								\
+		preempt_disable();					\
+		__get_cpu_var(nf_conntrack_stat).count++;		\
+		preempt_enable();					\
+	} while (0);
 
 /* no helper, no nat */
 #define	NF_CT_F_BASIC	0

_

and will let others worry about what the real fix (for 2.6.20, please) is.