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SubjectRe: [PATCH 1/2] selftests: add a kselftest for SLUB debugging functionality
On Tue, 16 Mar 2021, glittao@gmail.com wrote:

> From: Oliver Glitta <glittao@gmail.com>
>
> SLUB has resiliency_test() function which is hidden behind #ifdef
> SLUB_RESILIENCY_TEST that is not part of Kconfig, so nobody
> runs it. Kselftest should proper replacement for it.
>
> Try changing byte in redzone after allocation and changing
> pointer to next free node, first byte, 50th byte and redzone
> byte. Check if validation finds errors.
>
> There are several differences from the original resiliency test:
> Tests create own caches with known state instead of corrupting
> shared kmalloc caches.
>
> The corruption of freepointer uses correct offset, the original
> resiliency test got broken with freepointer changes.
>
> Scratch changing random byte test, because it does not have
> meaning in this form where we need deterministic results.
>
> Add new option CONFIG_TEST_SLUB in Kconfig.
>
> Add parameter to function validate_slab_cache() to return
> number of errors in cache.
>
> Signed-off-by: Oliver Glitta <glittao@gmail.com>

Acked-by: David Rientjes <rientjes@google.com>

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