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From: Borislav Petkov <bp@alien8.de>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>, x86-ml <x86@kernel.org>,
	lkml <linux-kernel@vger.kernel.org>,
	Andy Lutomirski <luto@kernel.org>
Subject: Re: WARNING: kernel stack frame pointer at ffffffff82e03f40 in swapper:0 has bad value (null)
Date: Tue, 13 Dec 2016 18:51:29 +0100	[thread overview]
Message-ID: <20161213175129.t6opvcuj5eukayki@pd.tnic> (raw)
In-Reply-To: <CALCETrVtjqXNCr22fGsmdg8ZyGSo=KO4uPMcfQNjdKr8ss5ykQ@mail.gmail.com>

On Tue, Dec 13, 2016 at 08:55:53AM -0800, Andy Lutomirski wrote:
> I want to file a GCC bug, though.  This code sucks.

Looks like it started doing that with gcc-5. gcc-4.9 output looks fine here:

        .globl  x86_64_start_kernel
        .type   x86_64_start_kernel, @function
x86_64_start_kernel:
.LFB2013:
        .loc 1 134 0
        .cfi_startproc
        pushq   %rbp    #
        .cfi_def_cfa_offset 16
        .cfi_offset 6, -16
        movq    %rsp, %rbp      #,
        .cfi_def_cfa_register 6
        pushq   %rbx    #
        .cfi_offset 3, -24
        .loc 1 134 0
        movq    %rdi, %rbx      # real_mode_data, real_mode_data
.LBB157:
.LBB158:
.LBB159:
.LBB160:
.LBB161:
        .loc 3 69 0
#APP
# 69 "./arch/x86/include/asm/special_insns.h" 1
        mov %cr4,%rax   # val

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

      parent reply	other threads:[~2016-12-13 17:20 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-10 16:17 WARNING: kernel stack frame pointer at ffffffff82e03f40 in swapper:0 has bad value (null) Borislav Petkov
2016-12-10 17:04 ` Josh Poimboeuf
2016-12-10 17:28   ` Borislav Petkov
2016-12-12 15:45     ` Josh Poimboeuf
2016-12-12 17:50       ` Borislav Petkov
2016-12-12 18:10         ` Josh Poimboeuf
2016-12-12 21:16           ` Josh Poimboeuf
2016-12-12 21:34             ` Borislav Petkov
2016-12-12 22:11               ` Josh Poimboeuf
2016-12-12 22:33                 ` Borislav Petkov
2016-12-12 23:05                   ` Josh Poimboeuf
2016-12-13 14:34                     ` Josh Poimboeuf
2016-12-13 16:55                       ` Andy Lutomirski
2016-12-13 17:26                         ` Josh Poimboeuf
2016-12-13 17:51                         ` Borislav Petkov [this message]

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