Re: [Xen-devel] pv kernel panic xen 4.4 unstable with large number of vcpus and default max_event_channel

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Sun, Dec 01, 2013 at 01:03:08AM -0500, Elena Ufimtseva wrote:
> Hi
> 
> pv kernel crashes when starting guest with vcpus above 150 with latest
> linux kernel. WIth increase of max_event_channel it boots (I tried
> 4096).
> 
> 
> [    0.387911] ------------[ cut here ]------------
> [    0.387918] kernel BUG at drivers/xen/events.c:909!

This is due to hypervisor failing to bind IPI for that guest. You're
probably running out of resources.

Try 'wc -l /proc/interrupts' 'grep ipi /proc/interrputs | wc -l' when
the guest is running to have an idea how many it needs. ;-)

Wei.

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