linux-kernel - 4.16 regression: s2ram broken on non-PAE i686

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Message-ID: <CAM6Zs0WTjWW+Lw3ws_iAH-K1dJgd5r9s0oC=u4TgEFUyC5bxig@mail.gmail.com>
Date:   Tue, 27 Feb 2018 07:54:44 -0500
From:   Woody Suwalski <terraluna977@...il.com>
To:     Linux Kernel List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        William Grant <william.grant@...onical.com>
Subject: 4.16 regression: s2ram broken on non-PAE i686

There is a problem with s2ram on 4.16, and it has now been propagated
to 4.15 and 4.14 stable updates.

It originates from

commit 62c00e6122a6b5aa7b1350023967a2d7a12b54c9
Author: William Grant <william.grant@...onical.com
<mailto:william.grant@...onical.com>>
Date:   Tue Jan 30 22:22:55 2018 +1100

    x86/mm: Fix overlap of i386 CPU_ENTRY_AREA with FIX_BTMAP

s2ram works OK on PAE kernels, breaks badly on non-PAE. I do not think
that the problem can be duplicated in VMPlayer, but it is 100%
reproducible on a "real" hardware.
System goes to sleep OK, but when woken - it reboots the PC.

The issue is tracked in Bugzilla bug 198763
[https://bugzilla.kernel.org/show_bug.cgi?id=198763]

Thanks, Woody