linux-kernel - Re: Call Trace when adding vCPU to guest

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Message-ID: <871q7d46e7.ffs@tglx>
Date: Wed, 10 Apr 2024 16:52:16 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Thorsten Leemhuis <regressions@...mhuis.info>, Linux kernel regressions
 list <regressions@...ts.linux.dev>
Cc: LKML <linux-kernel@...r.kernel.org>, xiangfeix.ma@...el.com
Subject: Re: Call Trace when adding vCPU to guest

On Wed, Apr 10 2024 at 15:48, Thorsten Leemhuis wrote:

> On 10.04.24 15:38, Thomas Gleixner wrote:
>> On Wed, Apr 10 2024 at 09:34, Linux regression tracking (Thorsten Leemhuis) wrote:
>>> To quote from https://bugzilla.kernel.org/show_bug.cgi?id=218698
>> [...]
>>>>
>>>> When hot adding a vCPU to the guest, the guest happens Call Trace and reboot.
>> 
>> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/urgent&id=a9025cd1c673a8d6eefc79d911075b8b452eba8f
>> 
>> It'll be in rc4
>
> Ahh, splendid, thx for replying! Ciao, Thorsten
>
> #regzbot fix: a9025cd1c673a8d6eefc79d911075b8b452eb

Ooops. No!

I just read back and noticed that this is a report against some whatever
kernel:

> [   49.782913] Call Trace:
> [   49.783039]  <TASK>
> [   49.783147]  ? __die+0x24/0x70
> [   49.783309]  ? page_fault_oops+0x82/0x150
> [   49.783518]  ? kernelmode_fixup_or_oops+0x84/0x110
> [   49.783753]  ? exc_page_fault+0xb9/0x160
> [   49.783948]  ? asm_exc_page_fault+0x26/0x30
> [   49.784144]  ? cpu_update_apic+0x1c/0x70
> [   49.784327]  generic_processor_info+0x7e/0x160
> [   49.784541]  acpi_register_lapic+0x19/0x80

# cd linus/linux
# gcur
master 2c71fdf02a95: Merge tag 'drm-fixes-2024-04-09' of https://gitlab.freedesktop.org/drm/kernel
# git grep generic_processor_info
#

generic_processor_info() was removed during the 6.9 merge window with
the topology rework before v6.9-rc1.

So the guest kernel _cannot_ be v6.9-rc2 at all.

Thanks,

        tglx