linux-kernel - Re: [REGRESSION] Platforms supporting SGX fail to kexec due to 96c6b8f212a ("memblock: report failures when memblock_can

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Date: Thu, 1 Feb 2024 11:38:38 +0100
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: Mike Rapoport <rppt@...nel.org>, Ashok Raj <ashok.raj@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
 LKML Mailing List <linux-kernel@...r.kernel.org>,
 Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...el.com>, Ingo Molnar <mingo@...nel.org>,
 regressions@...ts.linux.dev, Song Shuai <songshuaishuai@...ylab.org>
Subject: Re: [REGRESSION] Platforms supporting SGX fail to kexec due to
 96c6b8f212a ("memblock: report failures when memblock_can_resize is not set")

On 31.12.23 08:26, Mike Rapoport wrote:
> On Thu, Dec 28, 2023 at 04:33:49PM -0800, Ashok Raj wrote:
>> 96c6b8f212a ("memblock: report failures when memblock_can_resize is not set")
>>
>> Causes kexec failure. Backing out this change, kexec succeeds. Symptom is
>> it appears to hang, possibly hung at the panic. Although I have the
>> earlyprintk enabled, I don't see any console messages when new kernel
>> boots. 
>>
>> Also tested turning off CONFIG_X86_SGX, the kernel with this commit
>> included also kexec's fine.
>>
>> Booting from warm/cold reset has no issues. Only kexec to new kernel with
>> this change included and CONFIG_X86_SGX=y causes the kexec failure.
> 
> Can you add memblock=debug to the kernel command line and send logs for
> normal boot and kexec with CONFIG_X86_SGX=y and e96c6b8f212a reverted?

Ashok, you afaics never replied. Did you forget about it? Or was the
issue resolved later or never a regression in the first place? I for now
assume it's one of the latter and stop tracking this:

#regzbot inconclusive: radio silence from reporter
#regzbot ignore-activity

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