linux-kernel - Re: kexec reboot failed due to commit 75d090fd167ac

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Message-ID: <91daa8b6-57c2-424f-8c6c-647e05f2a8c9@leemhuis.info>
Date:   Thu, 21 Sep 2023 11:54:15 +0200
From:   "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dave Young <dyoung@...hat.com>
Cc:     Ard Biesheuvel <ardb@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Aaron Lu <aaron.lu@...el.com>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        kexec@...ts.infradead.org, Tom Lendacky <thomas.lendacky@....com>,
        x86@...nel.org
Subject: Re: kexec reboot failed due to commit 75d090fd167ac

On 13.09.23 16:24, Kirill A. Shutemov wrote:
> On Mon, Sep 11, 2023 at 05:57:07PM +0300, Kirill A. Shutemov wrote:
>> On Mon, Sep 11, 2023 at 10:56:36PM +0800, Dave Young wrote:
>>>> early console in extract_kernel
>>>> input_data: 0x000000807eb433a8
>>>> input_len: 0x0000000000d26271
>>>> output: 0x000000807b000000
>>>> output_len: 0x0000000004800c10
>>>> kernel_total_size: 0x0000000003e28000
>>>> needed_size: 0x0000000004a00000
>>>> trampoline_32bit: 0x000000000009d000
>>>>
>>>> Decompressing Linux... out of pgt_buf in arch/x86/boot/compressed/ident_map_64.c!?
>>>> pages->pgt_buf_offset: 0x0000000000006000
>>>> pages->pgt_buf_size: 0x0000000000006000
>>>>
>>>> Error: kernel_ident_mapping_init() failed
> [...]
>> The problem is not limited to unaccepted memory, it also triggers if we
>> reach efi_get_rsdp_addr() in the same setup.
>>
>> I think we have several problems here.
> [...]
>> Any comments?
> 
> I struggle to come up with anything better than increasing the constant to
> a value that "ought to be enough for anybody" ©, let's say 128K.
> 
> And we can eliminate logic on no-KASLR vs. KASLR vs. KASLR+VERBOSE_BOOTUP.
> 
> Objections?

Apparently not, as there was no reply since then (which is why I show up
here, as it looked like fixing this regression stalled).

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

#regzbot poke