Re: [PATCH] failslab - failmalloc for slab allocator

On Sun, 13 Aug 2006 18:22:19 +0800
Akinobu Mita <mita@xxxxxxxxxxxxxxxx> wrote:

This patch is not intended for inclusion. But I could find
several interesting crashes.

The idea behind failslab is to demonstrate what really happens if
slab allocation fails. The idea of failslab is completely taken
from failmalloc (http://www.nongnu.org/failmalloc/).

boot option:

failslab=<probability>,<interval>,<times>,<space>

<probability>
specifies how often it should fail in percent.
<interval>
specifies the interval of failures.
<times>
specifies how many times failures may happen at most.
<space>
specifies the size of free space where memory can be allocated
safely in bytes.

examples:

failslab=100,10,-1,0

slab allocation (kmalloc, kmem_cache_alloc,..) fails once per 10 times.

We would benefit from having some faul-injection capabilities in the
mainline kernel.

- kmalloc failures

- alloc_pages() failures

- disk IO errors (there are rumours of a DM module for this, but I
haven't seen it).

They would need to be lightweight, clean and enabled/configured at runtime,
not at boot time.

This would end up being a fairly complex project.
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