[ Added Davem and the sparc mailing list, since it happens on sparc
and that just makes me suspicious ]
On Fri, Mar 20, 2015 at 8:07 AM, David Ahern <david.ahern@xxxxxxxxxx> wrote:
> I can easily reproduce the panic below doing a kernel build with make -j N,
> N=128, 256, etc. This is a 1024 cpu system running 4.0.0-rc4.
3.19 is fine? Because I dont' think I've seen any reports like this
for others, and what stands out is sparc (and to a lesser degree "1024
cpus", which obviously gets a lot less testing)
> The top 3 frames are consistently:
> free_block+0x60
> cache_flusharray+0xac
> kmem_cache_free+0xfc
>
> After that one path has been from __mmdrop and the others are like below,
> from remove_vma.
>
> Unable to handle kernel paging request at virtual address 0006100000000000
One thing you *might* check is if the problem goes away if you select
CONFIG_SLUB instead of CONFIG_SLAB. I'd really like to just get rid of
SLAB. The whole "we have multiple different allocators" is a mess and
causes test coverage issues.
Apart from testing with CONFIG_SLUB, if 3.19 is ok and you seem to be
able to "easily reproduce" this, the obvious thing to do is to try to
bisect it.
Linus
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