kern/183717: High CPU Utilization on HylaFAX processes
Chunping Ruan
ruanchunping at gmail.com
Wed Nov 6 14:30:00 UTC 2013
>Number: 183717
>Category: kern
>Synopsis: High CPU Utilization on HylaFAX processes
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Nov 06 14:30:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Chunping Ruan
>Release: stable/10
>Organization:
Malmam Ltd.
>Environment:
FreeBSD dev.******.com 10.0-BETA2 FreeBSD 10.0-BETA2 #0 r257377: Thu Oct 31 07:47:49 CST 2013 root at dev.******.com:/usr/obj/usr/src/sys/GENERIC_PF_ALTQ amd64
>Description:
The problem is the same as kern/166071 described.
The box is installed 9.1-RELEASE,and updated to stable/10 with custom kernel(add PF_ALTQ support).
Install hylafax from posts.
$ pkg info|grep hylafax
hylafax-6.0.6 Fax software
faxgetty and faxq cost too many cpu load.(>70% system.)
and can't receive or send fax.
$ ps -auxww|grep faxq
uucp 63466 63.1 0.1 35224 2836 - Rs 2:55PM 25:19.28 /usr/local/sbin/faxq
$ sudo ktrace -t c -p 63466
$ sudo ktrace -C
$ sudo kdump -R
63466 faxq 1383636856.659275 CALL read(0x4,0x7fffffffcfa0,0x7ff)
63466 faxq 0.000257 RET read 0
63466 faxq 0.000055 CALL select(0x5,0x7fffffffd950,0x7fffffffd8d0,0x7fffffffd850,0)
63466 faxq 0.000031 RET select 1
63466 faxq 0.000026 CALL read(0x4,0x7fffffffcfa0,0x7ff)
63466 faxq 0.000024 RET read 0
63466 faxq 0.000041 CALL select(0x5,0x7fffffffd950,0x7fffffffd8d0,0x7fffffffd850,0)
63466 faxq 0.000027 RET select 1
63466 faxq 0.000025 CALL read(0x4,0x7fffffffcfa0,0x7ff)
63466 faxq 0.000024 RET read 0
63466 faxq 0.000022 CALL select(0x5,0x7fffffffd950,0x7fffffffd8d0,0x7fffffffd850,0)
63466 faxq 0.000023 RET select 1
63466 faxq 0.000037 CALL read(0x4,0x7fffffffcfa0,0x7ff)
63466 faxq 0.000025 RET read 0
63466 faxq 0.000024 CALL select(0x5,0x7fffffffd950,0x7fffffffd8d0,0x7fffffffd850,0)
63466 faxq 0.000024 RET select 1
63466 faxq 0.000023 CALL read(0x4,0x7fffffffcfa0,0x7ff)
63466 faxq 0.000023 RET read 0
========== more ===========
and , the /var/spool/hylafax/ is on zfs
$ mount
zroot on / (zfs, local, nfsv4acls)
devfs on /dev (devfs, local, multilabel)
zroot/data on /data (zfs, NFS exported, local, nfsv4acls)
zroot/data/ftp on /data/ftp (zfs, NFS exported, local, noatime, nfsv4acls)
zroot/data/mysql on /data/mysql (zfs, local, nfsv4acls)
zroot/home on /home (zfs, local, nfsv4acls)
zroot/tmp on /tmp (zfs, local, nfsv4acls)
zroot/usr on /usr (zfs, local, nfsv4acls)
zroot/var on /var (zfs, local, nfsv4acls)
$ zfs get all zroot/var
NAME PROPERTY VALUE SOURCE
zroot/var type filesystem -
zroot/var creation Wed Oct 30 22:42 2013 -
zroot/var used 2.16G -
zroot/var available 410G -
zroot/var referenced 1.84G -
zroot/var compressratio 1.00x -
zroot/var mounted yes -
zroot/var quota none default
zroot/var reservation none default
zroot/var recordsize 128K default
zroot/var mountpoint /var local
zroot/var sharenfs off default
zroot/var checksum on default
zroot/var compression off default
zroot/var atime on default
zroot/var devices on default
zroot/var exec on default
zroot/var setuid on default
zroot/var readonly off default
zroot/var jailed off default
zroot/var snapdir hidden default
zroot/var aclmode discard default
zroot/var aclinherit restricted default
zroot/var canmount on default
zroot/var xattr off temporary
zroot/var copies 1 default
zroot/var version 5 -
zroot/var utf8only off -
zroot/var normalization none -
zroot/var casesensitivity sensitive -
zroot/var vscan off default
zroot/var nbmand off default
zroot/var sharesmb off default
zroot/var refquota none default
zroot/var refreservation none default
zroot/var primarycache all default
zroot/var secondarycache all default
zroot/var usedbysnapshots 329M -
zroot/var usedbydataset 1.84G -
zroot/var usedbychildren 0 -
zroot/var usedbyrefreservation 0 -
zroot/var logbias latency default
zroot/var dedup off default
zroot/var mlslabel -
zroot/var sync standard default
zroot/var refcompressratio 1.00x -
zroot/var written 39.2M -
zroot/var logicalused 2.05G -
zroot/var logicalreferenced 1.80G -
$ sudo fstat -v -p 63466
USER CMD PID FD MOUNT INUM MODE SZ|DV R/W
uucp faxq 63466 text /usr 1630604 -r-sr-xr-x 274064 r
uucp faxq 63466 wd /var 1381 drwxr-xr-x 20 r
uucp faxq 63466 root / 4 drwxr-xr-x 26 r
uucp faxq 63466 0 /dev 7 crw-rw-rw- null rw
uucp faxq 63466 1 /dev 7 crw-rw-rw- null rw
uucp faxq 63466 2 /dev 7 crw-rw-rw- null rw
uucp faxq 63466 3 /dev 7 crw-rw-rw- null rw
uucp faxq 63466 4 /var 50545 prw------- 0 r
uucp faxq 63466 5* local dgram fffff80039013d20 <-> fffff80004ef7a50
FD 4, it's inode is 50545
$ ls -i /var/spool/hylafax/FIFO
50545 /var/spool/hylafax/FIFO
$ file /var/spool/hylafax/FIFO
/var/spool/hylafax/FIFO: fifo (named pipe)
>How-To-Repeat:
freebsd: amd64 stable/10
install hylafax from posts and start it.
edit /etc/ttys,add this line:
cuau0 "/usr/local/sbin/faxgetty" dialup on
kill -HUP 1
than call the fax modem from another phone.
monit the cpu usage from top.
>Fix:
Everything is ok from 7.1 to 8.2-RELEASE, and worked for 3 years.
so ,is it a bug about /usr/src/sys/fs/fifofs/fifo_vnops.c ?
>Release-Note:
>Audit-Trail:
>Unformatted:
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