Date: Fri, 11 Jan 2019 04:20:22 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 234838] ena drop-outs on 12.0-RELEASE Message-ID: <bug-234838-227-9U7CSmokY8@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-234838-227@https.bugs.freebsd.org/bugzilla/> References: <bug-234838-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D234838 --- Comment #2 from Leif Pedersen <leif@ofWilsonCreek.com> --- Of course! Thanks for looking! It's our standby MySQL database, so there's a light but steady stream of network IO for the DB replication. Its filesystems are ZFS. Once an hour, s= ix other machines (developer sandboxes) pull the latest ZFS snapshot of the DB= (in parallel) so our developers can clone any recent hourly snapshot for testin= g. These messages happen about three times per day at the top of the hour when this hourly pull would be running. They happen sometimes at other odd times: once on Jan 4, and once on Dec 19, looking at logs going back to Dec 12. So= it probably isn't just the 6 concurrent `zfs send`s that cause it. Also at the top of the hour, it runs a mysqldump cron which takes ~10 minut= es. That has nothing to do with the network; just full disclosure that it incre= ases CPU load significantly. There are batch jobs that send a lot of transactions through the DB replica= tion stream, but they don't seem to correlate. I think those cause only minimal network IO but high CPU & disk load. The machine doesn't do anything else. Hopefully that's a helpful idea of the work load. It's the only machine I've upgraded to 12. Our other machines are running 11.1. This one is my canary;= I dare not upgrade the more important machines with this symptom. Also, occasionally it will panic with the message "Fatal double fault" and = no backtrace. I can get you more on that if you want. Sometimes this panic hap= pens when the machine is booting, before it has even configured the network. Related? I dunno. Just giving you anything that might be useful. --=20 You are receiving this mail because: You are the assignee for the bug.=
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