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Weird output from ps command

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# 1  
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 ????
# 2  
Old 08-29-2015
As you already found, -L displays the light weight processes (LWP also named threads).
Then the grep picks the one with the Z state.
You can better compare ps -eLo ... with ps -eLf
This User Gave Thanks to MadeInGermany For This Post:
brij123
# 3  
Old 09-04-2015
Any comments why this process has a Zombie thread ?
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