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Date:      Tue, 19 Sep 2023 09:56:59 -0400
From:      Justin Hibbits <jhibbits@FreeBSD.org>
To:        Luciano Mannucci <luciano@vespaperitivo.it>
Cc:        freebsd-questions@freebsd.org, freebsd-ppc@freebsd.org
Subject:   Re: Kernel panic
Message-ID:  <20230919095659.054c7fd9@ralga.knownspace>
In-Reply-To: <4Rqj662THHzhhQ@baobab.bilink.it>
References:  <4Rqj662THHzhhQ@baobab.bilink.it>

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On Tue, 19 Sep 2023 15:23:25 +0200
Luciano Mannucci <luciano@vespaperitivo.it> wrote:

> This morning one of my freeBSD production machine did crash. Beeing a
> VM running under qemu/kvm on an ubuntu linux hardware, I was unable to
> get the panic video message issued when the machine crashed. Of course
> at the reboot I got a vmcore file in /var/crash, along with core.txt
> and info. The file core.txt says:
> 
> Unable to find a kernel debugger.
> Please install the devel/gdb port or gdb package.
> 
> while the info file is:
> 
> Dump header from device: /dev/vtbd0s2b
>   Architecture: powerpc64
>   Architecture Version: 1
>   Dump Length: 865083392
>   Blocksize: 512
>   Compression: none
>   Dumptime: 2023-09-19 09:04:31 +0200
>   Hostname: numeron
>   Magic: FreeBSD Kernel Dump
>   Version String: FreeBSD 13.1-RELEASE-p5
> releng/13.1-n250174-753d65a19a55 GENERIC Panic String: data storage
> interrupt trap Dump Parity: 907562729
>   Bounds: 1
>   Dump Status: good
> 
> what shoukd I do to know what did kill my machine?
> 
> Thanks to all,
> 
> Luciano.

Install the gdb package, then run kgdb on the core as:

kgdb -c /var/crash/vmcore.0

- Justin



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