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From: Li Qiang <liq3ea@gmail.com>
To: Paolo Bonzini <pbonzini@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>
Cc: Qemu Developers <qemu-devel@nongnu.org>
Subject: Does. there exists race condition in virtio-gpu device
Date: Wed, 9 Sep 2020 20:49:25 +0800	[thread overview]
Message-ID: <CAKXe6SJWAt8U-UmCqgtMwt-moL6MAtV5BpBiaM=BN92mQN0Z2g@mail.gmail.com> (raw)

Hello Gerd and Paolo,

I think there is a race condition in virtio-gpu device.
In 'virtio_gpu_reset' and 'virtio_gpu_process_cmdq' they both operate
on 'g->cmdq'.

However the 'virtio_gpu_reset' is in vcpu thread and the
'virtio_gpu_process_cmdq' is
in main thread through BH.

So I think there is a race condition. But I don't find a pattern for
this kind of bug(BH and vcpu thread). I missed anything?

Thanks,
Li Qiang


             reply	other threads:[~2020-09-09 12:51 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-09 12:49 Li Qiang [this message]
2020-09-14  7:42 ` Does. there exists race condition in virtio-gpu device Gerd Hoffmann

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