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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 38] 38.15 Cleaning Up an Unkillable Process </TITLE><METANAME="DC.title"CONTENT="UNIX Power Tools"><METANAME="DC.creator"CONTENT="Jerry Peek, Tim O'Reilly & Mike Loukides"><METANAME="DC.publisher"CONTENT="O'Reilly & Associates, Inc."><METANAME="DC.date"CONTENT="1998-08-04T21:49:58Z"><METANAME="DC.type"CONTENT="Text.Monograph"><METANAME="DC.format"CONTENT="text/html"SCHEME="MIME"><METANAME="DC.source"CONTENT="1-56592-260-3"SCHEME="ISBN"><METANAME="DC.language"CONTENT="en-US"><METANAME="generator"CONTENT="Jade 1.1/O'Reilly DocBook 3.0 to HTML 4.0"><LINKREV="made"HREF="mailto:online-books@oreilly.com"TITLE="Online Books Comments"><LINKREL="up"HREF="ch38_01.htm"TITLE="38. Starting, Stopping, and Killing Processes"><LINKREL="prev"HREF="ch38_14.htm"TITLE="38.14 Processes Out of Control? Just STOP Them "><LINKREL="next"HREF="ch38_16.htm"TITLE="38.16 Why You Can't Kill a Zombie "></HEAD><BODYBGCOLOR="#FFFFFF"TEXT="#000000"><DIVCLASS="htmlnav"><H1><IMGSRC="gifs/smbanner.gif"ALT="UNIX Power Tools"USEMAP="#srchmap"BORDER="0"></H1><MAPNAME="srchmap"><AREASHAPE="RECT"COORDS="0,0,466,58"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="467,0,514,18"HREF="jobjects/fsearch.htm"ALT="Search this book"></MAP><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch38_14.htm"TITLE="38.14 Processes Out of Control? Just STOP Them "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 38.14 Processes Out of Control? Just STOP Them "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 38<BR>Starting, Stopping, and Killing Processes</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch38_16.htm"TITLE="38.16 Why You Can't Kill a Zombie "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 38.16 Why You Can't Kill a Zombie "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-0298">38.15 Cleaning Up an Unkillable Process </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-43321"></A><ACLASS="indexterm"NAME="AUTOID-43324"></A>You or another user might have a process that (according to<SPANCLASS="link"><EMCLASS="emphasis">ps</EM> (<ACLASS="linkend"HREF="ch38_05.htm"TITLE="The ps Command ">38.5</A>)</SPAN>)has been sleeping for severaldays, waiting for input.If you can't<SPANCLASS="link">kill (<ACLASS="linkend"HREF="ch38_10.htm"TITLE="Destroying Processes with kill ">38.10</A>)</SPAN>the process, even with <EMCLASS="emphasis">kill -9</EM>,there may be a bug or some other problem.</P><ULCLASS="itemizedlist"><LICLASS="listitem"><PCLASS="para">These processes can be unkillable because they've made a request for ahardware device or network resource.UNIX has put them to sleep at a very high priority and the eventthat they are waiting on hasn't happened (because of a network problem,for example).This causes <EMCLASS="emphasis">all</EM> other signals to be held until the hardware event occurs.The signal sent by <EMCLASS="emphasis">kill</EM> doesn't do any good.</P></LI><LICLASS="listitem"><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-43337"></A>If the problem is with a terminal and you can get to the back of the terminalor the back of the computer, try unplugging the line from the port.Also, try typing CTRL-qon the keyboard - if the user typed CTRL-swhile getting a lot of output, this may free the process.</P></LI><LICLASS="listitem"><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-43342"></A>Ask your vendor if there's a special command to reset the<SPANCLASS="link">device driver (<ACLASS="linkend"HREF="ch42_01.htm#UPT-ART-1142"TITLE="Making Sense Out of the Terminal Mess ">42.1</A>)</SPAN>.If there isn't, you may have to reboot the computer.</P></LI></UL><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">JP</SPAN></P></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch38_14.htm"TITLE="38.14 Processes Out of Control? 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