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Re: [Qemu-discuss] qemu-system-arm linux guest reboot sometimes hangs

From: Peter Maydell
Subject: Re: [Qemu-discuss] qemu-system-arm linux guest reboot sometimes hangs
Date: Tue, 16 Oct 2018 10:39:53 +0100

On 16 October 2018 at 10:16, Jaap Crezee <address@hidden> wrote:
> I am having a stability issue which results in some of my nightly builds 
> failing. During nightly testing, the VM is rebooted. Most reboots work fine,
> but occasionally the VM hangs. The issue seems to be reproducible more 
> difficult on my development desktop, but it is observable there after some
> time. I created a reboot tool which logs in over ssh on the VM and reboots 
> it. It will detect the machine goes down (icmp) and waits for it to come
> back (icmp). Once it is back, the tool waits some random time between 1 and 
> 20 seconds and starts the reboot cycle again. Eventually the tool fails
> because the VM does not come back: it hangs.

There is a race condition I discovered recently for TCG guests where
occasionally a request for a system reset is lost. It may be you're
running into that. We don't have a patch for it yet, but when we
do I'll cc you so you can test it, if you like.

-- PMM

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