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SubjectRe: WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413
On 2011.11.22 at 08:48 +0100, Eric Dumazet wrote:
> Le lundi 21 novembre 2011 à 21:18 -0600, Christoph Lameter a écrit :
>
> > Hmmm... That means that c->page points to page not frozen. Per cpu
> > partial pages are frozen until they are reused or until the partial list
> > is flushed.
> >
> > Does this ever happen on x86 or only on other platforms? In put_cpu_partial() the
> > this_cpu_cmpxchg really needs really to be irq safe. this_cpu_cmpxchg is
> > only preempt safe.
> >
> > Index: linux-2.6/mm/slub.c
> > ===================================================================
> > --- linux-2.6.orig/mm/slub.c 2011-11-21 21:15:41.575673204 -0600
> > +++ linux-2.6/mm/slub.c 2011-11-21 21:16:33.442336849 -0600
> > @@ -1969,7 +1969,7 @@
> > page->pobjects = pobjects;
> > page->next = oldpage;
> >
> > - } while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
> > + } while (irqsafe_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
> > stat(s, CPU_PARTIAL_FREE);
> > return pobjects;
> > }
> >
>
> For x86, I wonder if our !X86_FEATURE_CX16 support is correct on SMP
> machines.
>
> this_cpu_cmpxchg16b_emu() claims to be IRQ safe, but may be buggy...
>
> Could we have somewhere a NMI handler calling kmalloc() ?
>
> Please Markus send us :
>
> cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 16
model : 4
model name : AMD Phenom(tm) II X4 955 Processor
stepping : 2
microcode : 0x10000c6
cpu MHz : 800.000
cache size : 512 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl
nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm
extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit
wdt npt lbrv svm_lock nrip_save
bogomips : 6420.59
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate
(*4)
--
Markus
--
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