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=230808 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_harvestq 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_harvestq 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_harvestq 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 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,KEYBOARD,ATTACH,CACHED kern.random.harvest.mask_bin: 00000010000000111111111 kern.random.harvest.mask: 66047 kern.random.random_sources: 'Intel Secure Key RNG' -- You are receiving this mail because: You are the assignee for the bug.
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