Mike,
Apply this patch to 4.0-7.4 and run it on your live system.
It works with the sample vmcore you sent me, and it should also alleviate
many of the errors that I suggested might be due to the underlying
shifting sands of your live system.
I don't know why this is the first report of this, nor why I've never
seen this before? The problem has to do with using invalid entries
in the kmem_cache.nodelists[MAXNUMNODES] array of kmem_list3 data
structures. To date, the unused entries have typically been NULL
for non-existent memory nodes, but not so with your kernel.
Let me know how it works for you.
Thanks,
Dave
--- memory.c.orig 2008-10-17 15:50:55.000000000 -0400
+++ memory.c 2008-10-17 15:50:46.000000000 -0400
@@ -7542,12 +7542,16 @@
for (i = 0; i < vt->kmem_cache_len_nodes && start_address[i]; i++) {
if (readmem(start_address[i] + OFFSET(kmem_list3_shared),
KVADDR, &shared, sizeof(void *),
- "kmem_list3 shared", RETURN_ON_ERROR|QUIET) &&
- readmem(shared + OFFSET(array_cache_limit),
+ "kmem_list3 shared", RETURN_ON_ERROR|QUIET)) {
+ if (!shared)
+ break;
+ }
+ if (readmem(shared + OFFSET(array_cache_limit),
KVADDR, &limit, sizeof(int), "shared array_cache limit",
RETURN_ON_ERROR|QUIET)) {
if (limit > max_limit)
max_limit = limit;
+ break;
}
}
}
@@ -8977,6 +8981,9 @@
slab_buf = GETBUF(SIZE(slab));
for (index=0; (index < vt->kmem_cache_len_nodes) && start_address[index]; index++)
{
+ if ((vt->flags & NODES_ONLINE) && (next_online_node(index) != index))
+ break;
+
slab_chains[0] = start_address[index] + OFFSET(kmem_list3_slabs_partial);
slab_chains[1] = start_address[index] + OFFSET(kmem_list3_slabs_full);
slab_chains[2] = start_address[index] + OFFSET(kmem_list3_slabs_free);
@@ -9078,6 +9085,9 @@
slab_buf = GETBUF(SIZE(slab));
for (index=0; (index < vt->kmem_cache_len_nodes) && start_address[index]; index++)
{
+ if ((vt->flags & NODES_ONLINE) && (next_online_node(index) != index))
+ break;
+
slab_chains[0] = start_address[index] + OFFSET(kmem_list3_slabs_partial);
slab_chains[1] = start_address[index] + OFFSET(kmem_list3_slabs_full);
slab_chains[2] = start_address[index] + OFFSET(kmem_list3_slabs_free);
@@ -10159,7 +10169,7 @@
sizeof(ulong) * vt->kmem_cache_len_nodes , "array nodelist array",
RETURN_ON_ERROR) ||
!readmem(start_address[index] + OFFSET(kmem_list3_shared), KVADDR, &shared,
- sizeof(void *), "kmem_list3 shared", RETURN_ON_ERROR|QUIET) ||
+ sizeof(void *), "kmem_list3 shared", RETURN_ON_ERROR|QUIET) || !shared ||
!readmem(shared + OFFSET(array_cache_avail), KVADDR, &avail, sizeof(int),
"shared array_cache avail", RETURN_ON_ERROR|QUIET) || !avail) {
FREEBUF(start_address);
--
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