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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1475204
Title:
Fix kmalloc slab creation sequence
Status in linux package in Ubuntu:
Incomplete
Bug description:
[Impact]
commit 4066c33d0308f8 breaks booting under KVM
https://lkml.org/lkml/2015/6/26/341
I can no longer boot Linus's tree under KVM using a 32-bit i386 build;
it just hangs before any messages get sent to the serial console.
This following commit breaks 32-bit and 64-bit x86 if you have
CONFIG_SLAB enabled. When I switched to CONFIG_SLUB, the kernel
boots. So it appears this commit is breaking kernel configurations
with CONFIG_SLAB enabled.
It bisects down to:
commit 4066c33d0308f87e9a3b0c7fafb9141c0bfbfa77
Author: Gavin Guo <gavin....@canonical.com>
Date: Wed Jun 24 16:55:54 2015 -0700
mm/slab_common: support the slub_debug boot option on specific
object size
The slub_debug=PU,kmalloc-xx cannot work because in the
create_kmalloc_caches() the s->name is created after the
create_kmalloc_cache() is called. The name is NULL in the
create_kmalloc_cache() so the kmem_cache_flags() would not set the
slub_debug flags to the s->flags. The fix here set up a kmalloc_names
string array for the initialization purpose and delete the dynamic name
creation of kmalloc_caches.
[a...@linux-foundation.org: s/kmalloc_names/kmalloc_info/, tweak comment
text]
Signed-off-by: Gavin Guo <gavin....@canonical.com>
Acked-by: Christoph Lameter <c...@linux.com>
Cc: Pekka Enberg <penb...@kernel.org>
Cc: David Rientjes <rient...@google.com>
Cc: Joonsoo Kim <iamjoonsoo....@lge.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
[Fix]
[PATCH] Fix kmalloc slab creation sequence
https://lkml.org/lkml/2015/6/29/231
The patch is to fix the kmalloc_caches initialization sequence, that
the 96, and 192 bytes kmem_cache should be enabled after the normal
2's exponential size kmem_cache.
This patch restores the slab creation sequence that was broken by
commit 4066c33d0308f8 and also reverts the portions that introduced
the KMALLOC_LOOP_XXX macros. Those can never really work since the
slab creation is much more complex than just going from a minimum to
a maximum number.
The latest upstream kernel boots cleanly on my machine with a 64 bit
x86 configuration under KVM using either SLAB or SLUB.
[Test cases]
Currently, the bug can't be reproduced on the Ubuntu kernel by
enabling the slab allocator with i386 and x86_64 architecture.
However, in case anyone will hit the bug, the patch should be applied
in the Ubuntu kernel.
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