Date: Tue, 10 Apr 2018 17:29:28 +1000 (EST) From: Bruce Evans <brde@optusnet.com.au> Cc: bugs@freebsd.org Subject: Re: [Bug 227404] UP FreeBSD VM always hangs on reboot since 20180329-r331740 Message-ID: <20180410170920.X1375@besplex.bde.org> In-Reply-To: <bug-227404-227-N8ak6Hi81s@https.bugs.freebsd.org/bugzilla/> References: <bug-227404-227@https.bugs.freebsd.org/bugzilla/> <bug-227404-227-N8ak6Hi81s@https.bugs.freebsd.org/bugzilla/>
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On Tue, 10 Apr 2018 a bug that doesn't want replies@freebsd.org wrote: > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227404 > ... > --- Comment #1 from Dexuan Cui <decui@microsoft.com> --- > When the issue happens, the cpu utilization of the UP VM is 100%. > > While we're trying to find the first bad revision, it would be great if > somebody can report if the issue also happens to bare metal or other > hypervisors. This has been happening for at least several months on real hardware too. SMP kernels hang on a 1-CPU system and on an 8-CPU systems with all except 1 CPU turned off in the BIOS. They don't hang on the 8-CPU system with at least 2 CPUs turned on. UP kernels don't hang. I use SCHED_4BSD. SCHED_ULE is apparently not much different for this. Bruce
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