Date: Tue, 21 Aug 2018 19:20:42 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 230808] rand_harvestq high CPU utilization Message-ID: <bug-230808-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230808 Bug ID: 230808 Summary: rand_harvestq high CPU utilization Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: danilo@FreeBSD.org I'm seeing a high CPU utilization by the thread rand_harvestq. It's easily reproducible in my system, just reading from /dev/urandom for 2 seconds is enough to trigger this issue. The rand_harvestq start eating CPU= for minutes and the system (at least the graphical interface) start freezing for few seconds. After some minutes the thread stop the high CPU consumption and the system = stop freezing. PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 19 root -16 - 0 16K CPU3 3 6:31 100.00% rand_harv= estq 11 root 155 ki31 0 64K CPU2 2 327:17 98.30% idle{idle: cpu2} 11 root 155 ki31 0 64K RUN 3 323:58 69.61% idle{idle: cpu3} 11 root 155 ki31 0 64K CPU0 0 325:32 69.01% idle{idle: cpu0} 11 root 155 ki31 0 64K RUN 1 327:07 58.61% idle{idle: cpu1} PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 19 root -16 - 0 16K CPU1 1 27:50 99.98% rand_harv= estq 11 root 155 ki31 0 64K CPU2 2 359:58 98.65% idle{idle: cpu2} 11 root 155 ki31 0 64K RUN 3 351:16 98.41% idle{idle: cpu3} 11 root 155 ki31 0 64K CPU0 0 357:59 94.45% idle{idle: cpu0} 11 root 155 ki31 0 64K RUN 1 345:23 4.51% idle{idle: cpu1} PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 19 root -16 - 0 16K CPU3 3 28:16 100.00% rand_harv= estq 11 root 155 ki31 0 64K CPU0 0 358:24 97.82% idle{idle: cpu0} 11 root 155 ki31 0 64K RUN 2 360:23 97.78% idle{idle: cpu2} 11 root 155 ki31 0 64K RUN 3 351:36 70.94% idle{idle: cpu3} 11 root 155 ki31 0 64K CPU1 1 345:31 25.92% idle{idle: cpu1} More information about my setup $ uname -a FreeBSD capeta 12.0-ALPHA2 FreeBSD 12.0-ALPHA2 #14 r337973M: Fri Aug 17 13:03:01 -03 2018=20=20=20=20 danilo@capeta:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG amd64 $ sysctl kern.random kern.random.fortuna.minpoolsize: 64 kern.random.harvest.mask_symbolic: PURE_RDRAND,[UMA],[FS_ATIME],SWI,INTERRUPT,NET_NG,NET_ETHER,NET_TUN,MOUSE,K= EYBOARD,ATTACH,CACHED kern.random.harvest.mask_bin: 00000010000000111111111 kern.random.harvest.mask: 66047 kern.random.random_sources: 'Intel Secure Key RNG' --=20 You are receiving this mail because: You are the assignee for the bug.=
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