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Re: [bug] SLUB + mm/slab.c boot crash in -rc9

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To: Pekka Enberg <penberg@...>
Cc: <linux-kernel@...>, Christoph Lameter <clameter@...>, Mel Gorman <mel@...>, Nick Piggin <npiggin@...>, Linus Torvalds <torvalds@...>, Andrew Morton <akpm@...>, Rafael J. Wysocki <rjw@...>, <Yinghai.Lu@...>
Date: Tuesday, April 15, 2008 - 2:25 am

you asked me to run with the debug patch attached below. I just tried 
vanilla -rc9 (head 120dd64cacd4fb7) and it still crashes with this 
config:

  http://redhat.com/~mingo/misc/config-Thu_Apr_10_10_41_16_CEST_2008.bad.rc9

debug output is:

  http://redhat.com/~mingo/misc/log-Thu_Apr_10_10_41_16_CEST_2008.bad.rc9

so it's probably the first few page allocations (setup_cpu_cache()) 
going wrong already - suggesting a some fundamental borkage in SLAB?

note, when i change SLAB to SLUB (and keep the config unchanged 
otherwise), i get a similar early crash:

  http://redhat.com/~mingo/misc/log-Tue_Apr_15_07_24_59_CEST_2008.bad
  http://redhat.com/~mingo/misc/config-Tue_Apr_15_07_24_59_CEST_2008.bad

i've also uploaded a bzImage (SLUB, debug patch not applied) that you 
can pick up and run on any 32-bit test-system:

  http://redhat.com/~mingo/misc/bzImage-Thu_Apr_10_10_41_16_CEST_2008.bad.rc9

it's a relatively generic bzImage that should boot on most whitebox PCs 
on most distros as long as you use a pure ext3 setup and might even give 
you networking (no modules or initrd is needed). It boots fine on two 
other 32-bit PCs i have (an Intel laptop and an AMD desktop).

	Ingo

Index: linux/mm/page_alloc.c
===================================================================
--- linux.orig/mm/page_alloc.c
+++ linux/mm/page_alloc.c
@@ -1485,6 +1485,7 @@ restart:
 		 * Happens if we have an empty zonelist as a result of
 		 * GFP_THISNODE being used on a memoryless node
 		 */
+		WARN_ON(1);
 		return NULL;
 	}
 
Index: linux/mm/slab.c
===================================================================
--- linux.orig/mm/slab.c
+++ linux/mm/slab.c
@@ -1682,6 +1682,7 @@ static void *kmem_getpages(struct kmem_c
 		flags |= __GFP_RECLAIMABLE;
 
 	page = alloc_pages_node(nodeid, flags, cachep->gfporder);
+	WARN_ON(!page);
 	if (!page)
 		return NULL;
 
@@ -2620,6 +2621,7 @@ static struct slab *alloc_slabmgmt(struc
 		/* Slab management obj is off-slab. */
 		slabp = kmem_cache_alloc_node(cachep->slabp_cache,
 					      local_flags & ~GFP_THISNODE, nodeid);
+		WARN_ON(!slabp);
 		if (!slabp)
 			return NULL;
 	} else {
--
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Messages in current thread:
Re: [bug] mm/slab.c boot crash in -git, "kernel BUG at mm/sl..., Christoph Lameter, (Fri Apr 11, 3:25 pm)
Re: [bug] mm/slab.c boot crash in -git, "kernel BUG at mm/sl..., Christoph Lameter, (Fri Apr 11, 3:26 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 2:25 am)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Linus Torvalds, (Tue Apr 15, 12:02 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 12:15 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 4:23 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Linus Torvalds, (Tue Apr 15, 1:23 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 3:39 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 3:54 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 4:03 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 4:17 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 4:54 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 4:58 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 5:08 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Pekka Enberg, (Tue Apr 15, 4:34 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 4:40 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Linus Torvalds, (Tue Apr 15, 5:06 pm)
Re: [patch] mm: sparsemem memory_present() memory corruption..., KAMEZAWA Hiroyuki, (Tue Apr 15, 9:48 pm)
Re: [patch] mm: sparsemem memory_present() memory corruption..., Christoph Lameter, (Tue Apr 15, 8:45 pm)
Re: [patch] mm: sparsemem memory_present() memory corruption..., Christoph Lameter, (Tue Apr 15, 8:19 pm)
Re: [patch] mm: sparsemem memory_present() memory corruption..., Christoph Lameter, (Tue Apr 15, 8:46 pm)
Re: [patch] mm: sparsemem memory_present() memory corruption..., KAMEZAWA Hiroyuki, (Tue Apr 15, 10:20 pm)
Re: [patch] mm: sparsemem memory_present() memory corruption..., Christoph Lameter, (Tue Apr 15, 8:10 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 5:13 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 5:24 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 5:42 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 5:55 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 6:06 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Yinghai Lu, (Tue Apr 15, 7:18 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 6:13 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 6:27 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 7:22 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 7:27 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 8:04 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 7:32 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 6:32 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 4:28 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 4:34 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 4:42 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 4:50 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 4:58 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 5:08 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 5:19 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Mike Travis, (Tue Apr 15, 5:27 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 5:21 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 5:23 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 5:24 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 5:28 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 6:07 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Mike Travis, (Tue Apr 15, 5:43 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Christoph Lameter, (Tue Apr 15, 5:33 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Mike Travis, (Tue Apr 15, 5:16 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 3:35 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 3:41 pm)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Pekka Enberg, (Tue Apr 15, 2:41 am)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 3:08 am)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 5:11 am)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Yinghai Lu, (Tue Apr 15, 4:31 am)
Re: [bug] SLUB + mm/slab.c boot crash in -rc9, Ingo Molnar, (Tue Apr 15, 4:46 am)
Re: [bug] mm/slab.c boot crash in -git, "kernel BUG at mm/sl..., Christoph Lameter, (Fri Apr 11, 3:28 pm)
Re: [bug] mm/slab.c boot crash in -git, "kernel BUG at mm/sl..., Christoph Lameter, (Sat Apr 12, 6:38 am)
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