Messages in this thread Patch in this message | | | Date | Tue, 15 Apr 2008 08:25:34 +0200 | From | Ingo Molnar <> | Subject | Re: [bug] SLUB + mm/slab.c boot crash in -rc9 |
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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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