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Full Discussion: Weird output from ps command
Top Forums UNIX for Advanced & Expert Users Weird output from ps command Post 302952885 by brij123 on Monday 24th of August 2015 07:03:06 AM
Old 08-24-2015
Weird output from ps command
Hi Guys,

I am regular Solaris user. I came across a weird problem that puzzled me. Hope you guys can help. I found that process's state(command & arguments) in two different variants of ps command is different. Can anyone explain how is this possible?


Code:
bash-3.2$ ps -eLo pid,s,comm,args | sort | uniq  | grep " Z "| grep -v grep 
  153 Z <defunct>                                                                        <defunct>                                                          
bash-3.2$ ps -ef | grep  syseventd| grep -v grep 
    root   153     1   0   Nov 26 ?           0:01 /usr/lib/sysevent/syseventd 
bash-3.2$ ps -eLo pid,s,comm,args | sort | uniq  | grep " Z "| grep -v grep 
  153 Z <defunct>                                                                        <defunct>                                                          
bash-3.2$ uname -a 
SunOS <hostname> 5.10 Generic_150400-11 sun4v sparc sun4v 
bash-3.2$ cat /etc/release 
                   Oracle Solaris 10 8/11 s10s_u10wos_17b SPARC 
  Copyright (c) 1983, 2011, Oracle and/or its affiliates. All rights reserved. 
                            Assembled 23 August 2011 
 
                  Solaris 10 1/13 (Update 11) Patchset applied. 
bash-3.2$

Thanks in advance for your guidance and support.

Brijesh

---------- Post updated at 06:03 AM ---------- Previous update was at 03:40 AM ----------

On further investigation I found that there are 17 light wait processes generated for syseventd daemon. One of them is going to state 'Z'. I compared it with another Solaris machine, it was happening there as well.

Code:
bash-3.2$  ps -eLo pid,s,lwp  | grep 153 
  153 S      1 
  153 S      2 
  153 S      3 
  153 S      4 
  153 S      5 
  153 S      6 
  153 S      7 
  153 S      8 
  153 S      9 
  153 S     10 
  153 S     11 
  153 Z     12 
  153 S     13 
  153 S     14 
  153 S     15 
  153 S     16 
  153 S     17 
bash-3.2$ sudo truss -p 153 
/15:    lwp_park(0x00000000, 0)         (sleeping...) 
/8:     lwp_park(0x00000000, 0)         (sleeping...) 
/2:     lwp_park(0x00000000, 0)         (sleeping...) 
/4:     sigtimedwait(0xFEE4BEB8, 0xFEE4BE38, 0x00000000) (sleeping...) 
/6:     lwp_park(0x00000000, 0)         (sleeping...) 
/9:     lwp_park(0x00000000, 0)         (sleeping...) 
/3:     lwp_park(0x00000000, 0)         (sleeping...) 
/5:     door_return(0xFED2BE58, 4, 0x00000000, 0) (sleeping...) 
/7:     lwp_park(0x00000000, 0)         (sleeping...) 
/16:    lwp_park(0x00000000, 0)         (sleeping...) 
/17:    door_return(0x00000000, 0, 0x00000000, 0) (sleeping...) 
/1:     pause()                         (sleeping...) 
/10:    lwp_park(0x00000000, 0)         (sleeping...) 
/14:    lwp_park(0x00000000, 0)         (sleeping...) 
/13:    lwp_park(0x00000000, 0)         (sleeping...) 
/11:    lwp_park(0x00000000, 0)         (sleeping...) 
^Cbash-3.2$

Whats going on ????
 

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LEARN ABOUT NETBSD

lastcomm

LASTCOMM(1)						    BSD General Commands Manual 					       LASTCOMM(1)

NAME

     lastcomm -- show last commands executed in reverse order

SYNOPSIS

     lastcomm [-w] [-f file] [command ...] [user ...] [terminal ...]

DESCRIPTION

     lastcomm gives information on previously executed commands.  With no arguments, lastcomm prints information about all the commands recorded
     during the current accounting file's lifetime.

     Option:

     -f file	 Read from file rather than the default accounting file.

     -w 	 Use as many columns as needed to print the output instead of limiting it to 80.

     If called with arguments, only accounting entries with a matching command name, user name, or terminal name are printed.  So, for example:

	   lastcomm a.out root ttyd0

     would produce a listing of all the executions of commands named a.out by user root on the terminal ttyd0.

     For each process entry, the following are printed.

	   o   The name of the user who ran the process.
	   o   Flags, as accumulated by the accounting facilities in the system.
	   o   The command name under which the process was called.
	   o   The amount of cpu time used by the process (in seconds).
	   o   The time the process started.
	   o   The elapsed time of the process.

     The flags are encoded as follows: ``S'' indicates the command was executed by the super-user, ``F'' indicates the command ran after a fork,
     but without a following exec(3), ``C'' indicates the command was run in PDP-11 compatibility mode (VAX only), ``D'' indicates the command
     terminated with the generation of a core file, and ``X'' indicates the command was terminated with a signal.

     The ``S'' and ``C'' flags are no longer recorded by the system, but will be reported by lastcomm when reading from an accounting file gener-
     ated by an older version of the system.

FILES

     /var/account/acct	Default accounting file.

SEE ALSO

     last(1), sigaction(2), acct(5), core(5)

HISTORY

     The lastcomm command appeared in 3.0BSD.

BSD
								 January 31, 2012							       BSD
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