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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