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Date:   Mon, 11 Jan 2021 15:40:19 -0800
From:   Andy Lutomirski <>
To:     Borislav Petkov <>
Cc:     Andy Lutomirski <>,
        "Chang S. Bae" <>,,
        x86-ml <>, lkml <>
Subject: Re: gdbserver + fsgsbase kaputt

On Mon, Jan 11, 2021 at 1:06 PM Andy Lutomirski <> wrote:
> > On Jan 11, 2021, at 12:00 PM, Borislav Petkov <> wrote:
> >
> > Or do you mean I should add "unsafe_fsgsbase" to grub cmdline and bisect
> > with fsgsbase enabled in all test kernels?
> Yes. But I can also look myself in a bit.

Tom, if I reproduce it in an interactive gdb and play a bit, I get:

Program received signal SIGSEGV, Segmentation fault.
0xf7df2cb6 in init_cacheinfo () from target:/lib/
(gdb) p $gs = $gs
$1 = 99
(gdb) si

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.

That's gdb itself crashing.  Any idea what's wrong?

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