svn commit: r281451 - head/sys/vm
Scott Long
scott4long at yahoo.com
Thu Apr 23 12:25:36 UTC 2015
> On Apr 12, 2015, at 12:21 AM, Dmitry Chagin <dchagin at FreeBSD.org> wrote:
>
> Author: dchagin
> Date: Sun Apr 12 06:21:58 2015
> New Revision: 281451
> URL: https://svnweb.freebsd.org/changeset/base/281451
>
> Log:
> Rework r281162. Indeed, the flexible array member is preferable here.
>
> Suggested by: Justin T. Gibbs
>
> MFC after: 3 days
>
> Modified:
> head/sys/vm/uma_core.c
> head/sys/vm/uma_int.h
There’s still something wrong with this. I have a machine with 28 cores (56 with hyperthreading) and 256GB of RAM, and ever since you committed r281162, it panics early in boot with a failed assertion. It looks like the first few members of a uma_slab_t are getting overwritten accidentally, and somehow the padding of the extra member in the uma_zone_t was previously protecting it. I don’t know the exact cause yet, but I must ask that you revert to r281161 in HEAD and stable/10 until the problem is resolved.
Thanks,
Scott
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