Date: Thu, 27 Aug 1998 17:04:13 -0700 (PDT) From: cjl@qnet.com To: freebsd-gnats-submit@FreeBSD.ORG Subject: kern/7764: ps(1) hangs in pfslck/lockrd - All subsequent ps(1) commands unkillable Message-ID: <199808280004.RAA01866@hub.freebsd.org>
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>Number: 7764
>Category: kern
>Synopsis: ps(1) hangs in pfslck/lockrd - All subsequent ps(1) commands unkillable
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Thu Aug 27 17:10:00 PDT 1998
>Last-Modified:
>Originator: Chris Linstruth
>Organization:
QNET
>Release: 2.2.7R
>Environment:
FreeBSD mx-a.qnet.com 2.2.7-RELEASE FreeBSD 2.2.7-RELEASE #0: Wed Jul 22 08:48:29 GMT 1998
root@builder.cdrom.com:/usr/src/sys/compile/GENERIC i386
>Description:
ps -aux hung. Terminated session, subsequent ps(1) commands also
hang. kill -9 ineffective. top -Sn all shows the following:
bash$ top -Sn all
last pid: 21449; load averages: 1.29, 1.16, 1.10 16:55:35
44 processes: 2 running, 42 sleeping
Mem: 32M Active, 3264K Inact, 11M Wired, 4280K Cache, 2884K Buf, 26M Free
Swap: 256M Total, 10M Used, 246M Free, 4% Inuse
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
21436 root 56 0 748K 976K RUN 0:01 23.43% 5.19% sendmail
21311 root 2 0 1004K 1120K sbwait 0:00 1.15% 1.11% sendmail
21444 root 2 0 676K 868K select 0:00 0.82% 0.11% sendmail
21445 root 2 0 676K 876K select 0:00 0.55% 0.08% sendmail
27180 root 2 0 652K 684K select 20:08 0.04% 0.04% sendmail
21448 root 2 0 716K 880K sbwait 0:00 0.78% 0.04% sendmail
21438 root 2 0 676K 868K select 0:00 0.21% 0.04% sendmail
13671 root 2 0 7276K 7124K select 57:46 0.00% 0.00% named
4 root 28 0 0K 12K update 10:55 0.00% 0.00% update
81 root 2 0 204K 404K select 7:44 0.00% 0.00% syslogd
1 root 10 0 484K 192K wait 1:27 0.00% 0.00% init
2 root -18 0 0K 12K psleep 1:04 0.00% 0.00% pagedaemon
116 root 18 0 332K 340K pause 0:20 0.00% 0.00% cron
0 root -18 0 0K 0K sched 0:02 0.00% 0.00% swapper
19021 root 2 0 948K 1208K connec 0:01 0.00% 0.00% sendmail
113 root 2 0 208K 344K select 0:01 0.00% 0.00% inetd
3 root 28 0 0K 12K psleep 0:00 0.00% 0.00% vmdaemon
165 root 18 0 460K 284K pause 0:00 0.00% 0.00% csh
17382 root 18 0 456K 284K pause 0:00 0.00% 0.00% csh
28124 root 18 0 456K 280K pause 0:00 0.00% 0.00% csh
21435 root 10 0 724K 884K wait 0:00 0.00% 0.00% sendmail
17395 root 10 0 640K 780K wait 0:00 0.00% 0.00% bash
21302 cjl 10 0 648K 744K wait 0:00 0.00% 0.00% bash
13465 root 10 0 728K 612K wait 0:00 0.00% 0.00% sendmail
20541 root 3 0 180K 596K ttyin 0:00 0.00% 0.00% getty
167 root 3 0 180K 272K ttyin 0:00 0.00% 0.00% getty
17158 root 2 0 724K 880K sbwait 0:00 0.00% 0.00% sendmail
21156 root 2 0 724K 876K sbwait 0:00 0.00% 0.00% sendmail
21358 root 2 0 724K 876K sbwait 0:00 0.00% 0.00% sendmail
21433 root 2 0 676K 868K select 0:00 0.00% 0.00% sendmail
21409 root 2 0 668K 796K connec 0:00 0.00% 0.00% sendmail
21411 root 2 0 668K 796K connec 0:00 0.00% 0.00% sendmail
21434 root 2 0 668K 796K connec 0:00 0.00% 0.00% sendmail
21301 root 2 0 220K 756K select 0:00 0.00% 0.00% telnetd
91 daemon 2 0 176K 256K select 0:00 0.00% 0.00% portmap
18121 root -6 0 244K 624K piperd 0:00 0.00% 0.00% grep
18584 root -6 0 676K 304K pfslck 0:00 0.00% 0.00% ps
18120 root -6 0 672K 304K pfslck 0:00 0.00% 0.00% ps
1761 cjl -6 0 676K 256K pfslck 0:00 0.00% 0.00% ps
1920 cjl -6 0 676K 256K pfslck 0:00 0.00% 0.00% ps
2002 cjl -6 0 676K 256K pfslck 0:00 0.00% 0.00% ps
13801 root -18 0 788K 612K lockrd 0:00 0.00% 0.00% sendmail
1697 root -18 0 676K 256K lockrd 0:00 0.00% 0.00% ps
21449 cjl 33 0 608K 828K RUN 0:00 0.00% 0.00% top
>How-To-Repeat:
Unknown what caused the first offending process to hang. Fairly sure it
was a ps -aux though. It's possible I attempted to SIGINT (^C) it.
>Fix:
>Audit-Trail:
>Unformatted:
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