Re: kernel BUGs when removing largish files with the SLOB allocator

Aubrey <[email protected]> wrote:

> Is there any solution/patch to fix the issue?

Make the SLOB allocator mark its pages PG_slab, just like the SLAB allocator
does.  I think this should be okay as the SLOB allocator and the SLAB
allocator seem to be mutually exclusive.

Using PG_slab would also give an instant check to things like SLOB's kfree().

> +#ifdef CONFIG_SLAB
>        if (PageSlab(page))
> +#endif

This is not a valid workaround as the object won't necessarily have been
allocated from a slab (shared ramfs mappings and SYSV SHM for example).  You
may not pass to ksize() objects allocated by means other than SLAB/SLOB.

David

-- 
VGER BF report: H 1.12398e-05
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Follow-Ups:
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  - From: David Howells <[email protected]>
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References:
- kernel BUGs when removing largish files with the SLOB allocator
  - From: Aubrey <[email protected]>

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