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SubjectRe: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf
On 2017.09.09 at 19:36 +0200, Borislav Petkov wrote:
> On Sat, Sep 09, 2017 at 07:23:52PM +0200, Markus Trippelsdorf wrote:
> > Hmm, the output is exactly the same as before your patch.
>
> Bah, that patch doesn't account for the fact that we're rereading the
> status field again in do_machine_check().
>
> Ok, let's force MCi_ADDR out. Ontop:

Thanks, will try it later.

I think the issue gets fixed by:

# wrmsr -a 0xc0010015 0x1000018

Setting bit 3 of the Hardware Configuration Register to 1.

Quote for the docs:
»TlbCacheDis: cacheable memory disable. Read-write. 0=Enables performance optimization that
assumes PML4, PDP, PDE, and PTE entries are in cacheable WB-DRAM; memory type checks may
be bypassed, and addresses outside of WB-DRAM may result in undefined behavior or NB protocol
errors. 1=Disables performance optimization and allows PML4, PDP, PDE and PTE entries to be in
any memory type. Operating systems that maintain page tables in memory types other than WB-
DRAM must set TlbCacheDis to insure proper operation.«


I've been successfully compiling for over 15 minutes now.

--
Markus

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