Date: Mon, 21 Oct 2013 12:38:55 +0100 (BST) From: Anton Shterenlikht <mexas@bris.ac.uk> To: FreeBSD-gnats-submit@freebsd.org Subject: ia64/183154: kernel{thread taskq} uses 100% CPU Message-ID: <201310211138.r9LBctFH066453@mech-cluster241.men.bris.ac.uk> Resent-Message-ID: <201310211140.r9LBe2g4028234@freefall.freebsd.org>
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>Number: 183154 >Category: ia64 >Synopsis: kernel{thread taskq} uses 100% CPU >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-ia64 >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon Oct 21 11:40:01 UTC 2013 >Closed-Date: >Last-Modified: >Originator: Anton Shterenlikht >Release: FreeBSD 11.0-CURRENT ia64 >Organization: University of Bristol >Environment: FreeBSD mech-as28.men.bris.ac.uk 11.0-CURRENT FreeBSD 11.0-CURRENT #8 r256624: Wed Oct 16 15:06:04 BST 2013 root@mech-as28.men.bris.ac.uk:/usr/obj/usr/src/sys/ZEEV ia64 >Description: This host is extremely sluggish. Periodically all activity seems to freeze for 5-10-30 sec. For example, issuing ls, df, top can lead to 10-20 sec. delay before the output appears. I noticed that the taskq thread is extremely busy, sometimes at 100%: last pid: 50628; load averages: 1.01, 1.09, 1.31 up 0+02:11:37 12:34:43 90 processes: 4 running, 69 sleeping, 15 waiting, 2 lock CPU 0: 0.0% user, 0.0% nice, 31.6% system, 0.0% interrupt, 68.4% idle CPU 1: 0.0% user, 0.0% nice, 68.8% system, 0.0% interrupt, 31.3% idle Mem: 22M Active, 1072M Inact, 411M Wired, 1014M Buf, 8560M Free Swap: PID USERNAME PRI NICE SIZE RES STATE C TIME CPU COMMAND 0 root 8 0 0K 416K CPU1 1 97:21 100.00% kernel{thread taskq} 11 root 155 ki31 0K 64K RUN 0 75:53 79.69% idle{idle: cpu0} 11 root 155 ki31 0K 64K RUN 1 71:38 18.90% idle{idle: cpu1} 21 root 16 - 0K 32K *buffe 0 0:41 0.10% syncer 21873 root 20 0 14232K 5800K CPU0 0 0:09 0.10% top 0 root -16 0 0K 416K swapin 0 1:34 0.00% kernel{swapper} 13 root -8 - 0K 96K - 0 0:18 0.00% geom{g_down} This is probably just a symptom of a deeper problem. >How-To-Repeat: >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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