Re: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413

[Eric Dumazet]

Le mercredi 23 novembre 2011 Ã 08:13 +0100, Markus Trippelsdorf a
Ãcrit :
> On 2011.11.22 at 09:27 +0100, Eric Dumazet wrote:
> > Le mardi 22 novembre 2011 Ã 08:48 +0100, Eric Dumazet a Ãcrit :
> > 
> > > For x86, I wonder if our !X86_FEATURE_CX16 support is correct on SMP
> > > machines.
> > > 
> > 
> > 
> > By the way, I wonder why we still emit this_cpu_cmpxchg16b_emu() code
> > and calls when compiling a kernel for a cpu implementing cmpxchg16b
> > 
> > (CONFIG_MCORE2=y)
> 
> Yeah, it's strange (CONFIG_MK8):
> 
> ffffffff811058b0 <__kmalloc>:
> ...
> ffffffff8110594f:       48 8d 4a 04             lea    0x4(%rdx),%rcx
> ffffffff81105953:       49 8b 1c 04             mov    (%r12,%rax,1),%rbx
> ffffffff81105957:       4c 89 e0                mov    %r12,%rax
> ffffffff8110595a:       e8 11 70 10 00          callq  ffffffff8120c970 <this_cpu_cmpxchg16b_emu>
> ffffffff8110595f:       66 66 90                data32 xchg %ax,%ax
> ffffffff81105962:       84 c0                   test   %al,%al
> ffffffff81105964:       74 c6                   je     ffffffff8110592c <__kmalloc+0x7c>
> ...
> 

This is patched at bootime (asm alternative)



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