linux-kernel - RE: [Regression v5.19-rc1] crash kexec fails to boot the 2nd kernel (Re: [PATCH v12 38/46] x86/sev: Add SEV-SNP feature detection/setup)

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Date:   Fri, 24 Jun 2022 10:14:58 +0000
From:   NOMURA JUNICHI(野村　淳一) 
        <junichi.nomura@....com>
To:     Borislav Petkov <bp@...en8.de>
CC:     "brijesh.singh@....com" <brijesh.singh@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        "michael.roth@....com" <michael.roth@....com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: RE: [Regression v5.19-rc1] crash kexec fails to boot the 2nd kernel
 (Re: [PATCH v12 38/46] x86/sev: Add SEV-SNP feature detection/setup)

From: Borislav Petkov <bp@...en8.de>
> What system is this? Full dmesg and .config pls.
> 
> How exactly are you launching the kexec kernel, etc, etc?

dmesg, kernel config and a script to load kexec is attached.

I could reproduce the problem as followings:

  # ./kexec-p-noinitrd.sh
  # cat /sys/kernel/kexec_crash_loaded
  1
  # echo c > /proc/sysrq-trigger

If the problem reproduces, the system stops or resets just after
showing a call trace of sysrq-panic on console.
On kernels without problem, it should show boot messages from
the 2nd kernel after the sysrq-panic call trace.

When I use "--noefi" option of kexec, the problem didn't occur.
So I think you need EFI-based system to reproduce the problem.

-- 
Jun'ichi Nomura, NEC Corporation / NEC Solution Innovators, Ltd.

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