linux-kernel - Re: Kernel panic - not syncing: IO-APIC + timer doesn't work!

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Message-ID: <87h7tsbs1n.fsf@nanos.tec.linutronix.de>
Date:   Mon, 27 Jul 2020 22:51:16 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Scott Branden <scott.branden@...adcom.com>, bp@...en8.de,
        x86@...nel.org, mingo@...hat.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Kernel panic - not syncing: IO-APIC + timer doesn't work!

Scott,

Scott Branden <scott.branden@...adcom.com> writes:

> Occasionally I get the following Kernel panic on boot.  This is
> running on the latest kernel but have seen it previously as well.
> "Kernel panic - not syncing: IO-APIC + timer doesn't work!  Boot with
> apic=debug and send a report."
>
> I don't know who I am support to send a report to.  But here is the log with apic=debug

> [    0.006000] ENABLING IO-APIC IRQs
> [    0.007000] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
> [    0.007000] ..MP-BIOS bug: 8254 timer not connected to IO-APIC
> [    0.007000] ...trying to set up timer (IRQ0) through the 8259A ...
> [    0.007000] ..... (found apic 0 pin 2) ...
> [    0.007000] ....... failed.
> [    0.007000] ...trying to set up timer as Virtual Wire IRQ...
> [    0.007000] ..... failed.
> [    0.007000] ...trying to set up timer as ExtINT IRQ...
> [    0.007000] ..... failed :(.
> [    0.007000] Kernel panic - not syncing: IO-APIC + timer doesn't work!  Boot with apic=debug and send a report.  Then try booting with the 'noapic' option.

Nothing which rings a bell. Can you please provide a boot log from a
successful boot with apic=debug on the command line?

Also you might check whether there are BIOS updates for this board. The
early Ryzen BIOSes had some rough edges.

Thanks,

        tglx