NetBSD Problem Report #56721
From www@netbsd.org Thu Feb 17 17:22:43 2022
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Date: Thu, 17 Feb 2022 17:22:41 +0000 (UTC)
From: schaecsn@gmx.net
Reply-To: schaecsn@gmx.net
To: gnats-bugs@NetBSD.org
Subject: nvmm fails on older linux kernels
X-Send-Pr-Version: www-1.0
>Number: 56721
>Category: kern
>Synopsis: nvmm fails on older linux kernels
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Thu Feb 17 17:25:00 +0000 2022
>Last-Modified: Tue May 30 04:00:02 +0000 2023
>Originator: Stefan Schaeckeler
>Release: 2021Q4
>Organization:
>Environment:
NetBSD xxx 9.2 NetBSD 9.2 (GENERIC) #0: Wed May 12 13:15:55 UTC 2021 mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>Description:
nvmm crashes on Linux kernels 1.2.13 and 2.0.36, but not on 2.2.18.
>How-To-Repeat:
Download a Linux distribution with said kernel version, say suse 6.0 (kernel 2.0.36) and boot it with nvmm enabled:
$ wget https://archive.org/download/suse-6.0_release_i386/SU6001.001.ISO
$ qemu-system-i386 -accel nvmm -cdrom SU6001.001.ISO -m 64M
NetBSD Virtual Machine Monitor accelerator is operational
qemu-system-i386: NVMM: Unexpected VM exit code 0xffffffffffffffff [hw=0x9]
qemu-system-i386: NVMM: Failed to execute a VCPU.
Abort trap (core dumped)
Qemu crashes while the Linux kernel boots up.
Booting the same iso without nvmm enabled does not crash qemu
$ qemu-system-i386 -cdrom SU6001.001.ISO -m 64M
>Fix:
>Audit-Trail:
From: Reinoud Zandijk <reinoud@NetBSD.org>
To: gnats-bugs@netbsd.org
Cc:
Subject: Re: kern/56721: nvmm fails on older linux kernels
Date: Thu, 9 Feb 2023 13:35:51 +0100
I've tried to replicate it on my amd64 machine
NetBSD 9.99.107 (GENERIC) #0: Sun Dec 18 17:14:55 CET 2022
QEMU emulator version 7.1.0
but couldn't replicate it. It boots fine with NVMM enabled. Trying a
NetBSD-current kernel out on a 9.x system in combination with nvmm and qemu is
a bit tricky. I have no idea what changed in the mean time. You might want to
update your Qemu if possible to see if its a qemu issue.
With regards,
Reinoud
From: Stefan Schaeckeler <schaecsn@gmx.net>
To: gnats-bugs@netbsd.org, kern-bug-people@netbsd.org,
gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Cc:
Subject: Re: kern/56721: nvmm fails on older linux kernels
Date: Mon, 29 May 2023 20:57:13 -0700
I still see the qemu crash. Now on NetBSD 9.3 with qemu 7.2.0 from
pkgsrc-2023Q1.
Well, the good news is then that the problem will go away with NetBSD 10.
Stefan
On 2/9/23 04:40, Reinoud Zandijk wrote:
> The following reply was made to PR kern/56721; it has been noted by GNAT=
S.
>
> From: Reinoud Zandijk <reinoud@NetBSD.org>
> To: gnats-bugs@netbsd.org
> Cc:
> Subject: Re: kern/56721: nvmm fails on older linux kernels
> Date: Thu, 9 Feb 2023 13:35:51 +0100
>
> I've tried to replicate it on my amd64 machine
>
> NetBSD 9.99.107 (GENERIC) #0: Sun Dec 18 17:14:55 CET 2022
> QEMU emulator version 7.1.0
>
> but couldn't replicate it. It boots fine with NVMM enabled. Trying a
> NetBSD-current kernel out on a 9.x system in combination with nvmm and=
qemu is
> a bit tricky. I have no idea what changed in the mean time. You might =
want to
> update your Qemu if possible to see if its a qemu issue.
>
> With regards,
> Reinoud
>
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