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Re: kern/51623 (Non-0 CPUs don't properly "start" under qemu)

The following reply was made to PR kern/51623; it has been noted by GNATS.

From: "David H. Gutteridge" <>
Subject: Re: kern/51623 (Non-0 CPUs don't properly "start" under qemu)
Date: Fri, 07 Apr 2017 17:39:55 -0400

 In my Linux host environment (Fedora 25, running QEMU 2.7.0 and 2.7.1
 over the past five months), I haven't encountered this problem with
 various amd64 kernels (7.99.40, 7.99.63, 7.99.65, 7.99.67). An SMP
 configuration of two or four CPUs works fine. I mention this as an
 additional data point.
 Having said that, I've been encountering significant stability
 problems of late with NetBSD kernels in this same environment, where
 seemingly at random they'll max out all available CPUs and I have to
 power cycle the VM, as it becomes completely unresponsive. There's no
 particular trigger in terms of user input. The VM can basically be
 idling when this spike suddenly occurs, and there's no particular
 association to uptime or load I can determine. (E.g., I can run a
 complete series of ATF tests, wait an hour, begin typing a command,
 and suddenly a spike will occur and max out all the CPUs.)

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