linux-kernel - Re: LTP test related to virtio releasing and reassigning resource leads to guest hung

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Message-ID: <38e69323-0185-32bb-2de1-8e5b36de2abc@tls.msk.ru>
Date:   Thu, 10 Aug 2023 12:08:36 +0300
From:   Michael Tokarev <mjt@....msk.ru>
To:     "longguang.yue" <kvmluck@....com>,
        qemu-devel <qemu-devel@...gnu.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: LTP test related to virtio releasing and reassigning resource
 leads to guest hung

10.08.2023 11:57, longguang.yue wrote:
> Hi, all:
> A ltp test leads to guest hung(io hung), the test releases virtio device resource and then reassign.
> I find device’s mem prefetchable resource 64-bit is changed.
> 
> ltp 
> test: https://github.com/linux-test-project/ltp/blob/522d7fba4afc84e07b252aa4cd91b241e81d6613/testcases/kernel/device-drivers/pci/tpci_kernel/ltp_tpci.c#L428
> 
> Do you know what cause the problem?
> 
> Thanks very much.
> 
> --------------------------
> ENV: kernel 5.10.0, qemu 6.2

Current qemu is 8.1 (well, almost, to be released this month;
previous release is 8.0 anyway).

This might be interesting to test in a current version before
going any further.

Thanks,

/mjt