linux-kernel - Re: CONFIG_VMAP_STACK, on-stack struct, and wake_up

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Message-ID: <411894642.13576957.1477594290544.JavaMail.zimbra@redhat.com>
Date:   Thu, 27 Oct 2016 14:51:30 -0400 (EDT)
From:   Bob Peterson <rpeterso@...hat.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: CONFIG_VMAP_STACK, on-stack struct, and wake_up_bit

| Here's a fix which works here - I'd appreciate it if you ran it and
| checked the microcode was applied correctly, i.e.:
| 
| $ dmesg | grep -i microcode
| 
| before and after the patch. Please paste that output in a mail too.

Hi Borislav,

Sorry it's taken me so long. I've been having issues.
I couldn't recreate that first boot failure, even using .config.old,
and even after removing (rm -fR) my linux.git and untarring it from the
original tarball, doing a make clean, etc.
The output before and after your new patch are the same (except for the times):

# dmesg | grep -i microcode
[    5.291679] microcode: microcode updated early to new patch_level=0x010000d9
[    5.298761] microcode: CPU0: patch_level=0x010000d9
[    5.303648] microcode: CPU1: patch_level=0x010000d9
[    5.308529] microcode: CPU2: patch_level=0x010000d9
[    5.313414] microcode: CPU3: patch_level=0x010000d9
[    5.360834] microcode: CPU4: patch_level=0x010000d9
[    5.365719] microcode: CPU5: patch_level=0x010000d9
[    5.370602] microcode: CPU6: patch_level=0x010000d9
[    5.375486] microcode: CPU7: patch_level=0x010000d9
[    5.380372] microcode: CPU8: patch_level=0x010000d9
[    5.385256] microcode: CPU9: patch_level=0x010000d9
[    5.390142] microcode: CPU10: patch_level=0x010000d9
[    5.395102] microcode: CPU11: patch_level=0x010000d9
[    5.437813] microcode: CPU12: patch_level=0x010000d9
[    5.442785] microcode: CPU13: patch_level=0x010000d9
[    5.447755] microcode: CPU14: patch_level=0x010000d9
[    5.452724] microcode: CPU15: patch_level=0x010000d9
[    5.457756] microcode: Microcode Update Driver: v2.01 <tigran@...azian.fsnet.co.uk>, Peter Oruba
# uname -a
Linux intec2 4.9.0-rc2+ #2 SMP Thu Oct 27 14:29:32 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux

Regards,

Bob Peterson