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

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Message-ID: <08a432e0-4e16-41a6-bad6-e6a51ea34a97@leemhuis.info>
Date:   Fri, 22 Sep 2023 12:12:44 +0200
From:   "Linux regression tracking #update (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     Dave Young <dyoung@...hat.com>, 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>,
        kexec@...ts.infradead.org, Tom Lendacky <thomas.lendacky@....com>,
        x86@...nel.org
Subject: Re: kexec reboot failed due to commit 75d090fd167ac

On 21.09.23 18:03, Kirill A. Shutemov wrote:
> On Thu, Sep 21, 2023 at 11:54:15AM +0200, Linux regression tracking (Thorsten Leemhuis) wrote:
>> 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).
> 
> It has been fixed in upstream by the commit f530ee95b72e
> ("x86/boot/compressed: Reserve more memory for page tables")

Ahh, great, thx for letting me know. That commit sadly missed a Link: or
Closes: tag to the regression report, which Linus and the docs ask for
(and regression tracking relies on), then it would have noticed this
automatically. Whatever, things happen, thx again.

#regzbot fix: f530ee95b72e

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.