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Re: [Qemu-devel] Windows 10 guest hang during 'info mem'

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Windows 10 guest hang during 'info mem'
Date: Fri, 24 Nov 2017 15:05:24 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 24/11/2017 13:57, Igor Mammedov wrote:
> I've stumbled on WS2016 hang when trying to list memory map in QEMU.
> Steps to reproduce:
>   qemu-system-x86_64 -monitor stdio -enable-kvm -m 1G ws2016x64.img
>  wait till guest boots and execute in monitor 
>   (qemu) info mem
> qemu will hang while printing mappings, consuming 100% cpu and not
> responding to ^C.
> I've also tried with old (2.8) and current qemu master and today's
> upstream kernel where it also doesn't work but WS2012R2x64 guest
> works just fine.
> PS:
> CCing KVM list as the issue happens only when KVM is enabled.

"info mem" code sucks and is unreadable.  We really should rewrite the
MMU stuff in TCG. :(

But, what is the backtrace?


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