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[Xen-devel] how to prevent crashes in notify_via_xen_event_channel during shutdown/crash


  • To: xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: Olaf Hering <olaf@xxxxxxxxx>
  • Date: Tue, 7 Sep 2010 21:52:07 +0200
  • Delivery-date: Tue, 07 Sep 2010 12:52:52 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

Hello,

I'm seeing crashes with 4.0.1 in notify_via_xen_event_channel() after
evtchn_destroy() was already executed, the ASSERT triggers.
There are a few calls to notify_via_xen_event_channel(), only
hvm_send_assist_req() seems to check the domain->is_shutting_down flag.
xen-unstable is not much different in that area.

How should a check for an already destroyed eventchannel look like?
Maybe like its done in free_xen_event_channel()?

Olaf


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