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Topic: Zombie process

	Facts about topic: (Zombie process) (Site not responding. Last check: 2007-10-09)
		A zombie process is not the same as an orphan process (additional info and facts about orphan process).
		The term zombie process derives from the common definition of zombie (Several kinds of rum with fruit juice and usually apricot liqueur) —an undead (additional info and facts about undead) person.
		Zombies can be identified in the output from the Unix ps command by the presence of a "Z" in the STAT column.
	www.absoluteastronomy.com /encyclopedia/z/zo/zombie_process.htm (269 words)

	Zombie (disambiguation) - Wikipedia, the free encyclopedia
		Zombi or Zombies is the title of the European version of Dawn of the Dead made by George A. Romero.
		Zombie ball, a magic trick in which a metal sphere appears to levitate while covered with a silk cloth.
		Zombie is a slang term used on online message boards and bulletin board systems to describe old discussion threads that are "brought back to life" by someone posting in them, sometimes months or even years since someone last posted in them.
	en.wikipedia.org /wiki/Zombie_(disambiguation) (307 words)

	Learn more about Computer process in the online encyclopedia. (Site not responding. Last check: 2007-10-09)
		Many processes may exist simultaneously but they must take turns on the CPU (unless there are multiple CPU's available).
		Processes are often called tasks in embedded operating systems.
		Processes are typically managed by the operating system, which keeps them separated and allocates the resources they need so that they are less likely to interfere with each other and cause system failures.
	www.onlineencyclopedia.org /c/co/computer_process.html (414 words)

	Zombie process - Computing Reference - eLook.org
		(Or "defunct process") A Unix process that has terminated (either because it has been killed by a signal or because it has called exit()) and whose parent process has not yet received notification of its termination by executing (some form of) the wait() system call.
		A zombie process exists solely as a process table entry and consumes no other resources.
		Zombie processes can be seen in "ps" listings occasionally (with a status "Z" in some versions).
	www.elook.org /computing/zombie-process.htm (110 words)

	Process (computing) - Wikipedia, the free encyclopedia
		In computing, a process is a running instance of a program, including all variables and other state.
		A multitasking operating system switches between processes to give the appearance of simultaneous execution, though in fact generally only one process can be executing at once per CPU.
		Processor state (context), such as the content of registers, physical memory addressing, etc. The state is stored in the actual registers when the process is executing, and in memory otherwise.
	en.wikipedia.org /wiki/Computer_process (432 words)

	Process (computing) (Site not responding. Last check: 2007-10-09)
		In computing, a process is, roughly speaking, a task being run by a computer, often simultaneously with many other tasks.
		The above description applies to both processes managed by an operating system, and processes as defined by process calculi.
		In the former case, the operating system keeps processes separated and allocates the resources they need so that they are less likely to interfere with each other and cause system failures.
	hallencyclopedia.com /Process_(computing) (356 words)

	Zombie process
		A zombie process is a term in computing for a process that exists but which has completed execution.
		When a zombie process cannot be destroyed it is usually because it is the parent of one or more child processes.
		Conversely, a child process might be a zombie because the parent has already died, but has not cleaned up after itself.
	www.brainyencyclopedia.com /encyclopedia/z/zo/zombie_process.html (222 words)

	LOSURS :: Documentation :: What Is a Zombie?
		When a process has already terminated ("died") by receiving a signal to do so, it can stick around for a bit to finish up a few last tasks.
		Once they're completed, the final thing that a process has to do before dying is to report its exit status to its parent.
		Whatever the process was waiting for eventually occurs and the process can report its exit status to its parent and all is well.
	www.losurs.org /docs/zombies (419 words)

	[No title]
		Process 1 is and other processes with process 0 as their parent may be protected from being given a KILL signal.
		Processes waiting at very high priorities can not be killed because the signal is first posted to the process kernel control data of the process; but the remaining processing and possible jump to process termination only occurs at lower priorities, that is, below PZERO.
		An immortal process is not necessarily a zombie.
	www-cdf.fnal.gov /offline/UNIX_Concepts/concepts.zombies.txt (992 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		Process F should do some form of wait to see which of its two child processes terminates first, report a message to this effect, and then wait for the other one to terminate, and report a message to this effect.
		Process G should do some form of wait to see which of its three child processes terminates first, report a message to this effect, and then wait for another one to terminate, and report a message to this effect,and then wait for the last child process to terminate, and report a message to this effect.
		Process M should do some form of wait to see which of its child processes terminates first, report a message to this effect, and so on, until it finds that its last child process has terminated, at which point it reports a message to this effect.
	www.cs.usask.ca /faculty/yyj066/cmpt330/assignment2.txt (2098 words)

	killing zombie process (Site not responding. Last check: 2007-10-09)
		Although no longer active, the child process is still in the system because its exit code needs to be stored in case the parent subsequently calls 'wait'.
		The child process is now a zombie which is no longer running, but which has been inherited by 'init' because of the abnormal termination of the parent process.
		The zombie will remain in the process table until the next time the process table is processed.
	www.kernel-panic.org /pipermail/kplug-list/2001-May/034814.html (321 words)

	Process termination (Site not responding. Last check: 2007-10-09)
		If a signal terminated the process, the system first tries to dump an image of core, then modifies the exit code to indicate which signal terminated the process and whether core was dumped.
		The terminating process is now a ``zombie'' process, with only its process-table entry remaining; and that is unavailable for use until the process has finally terminated.
		The last actions of exit are to record the accounting information and exit code for the terminated process in the zombie process-table entry and to send the parent the death-of-child signal, SIGCHLD (see ``Signals, job control and pipes'').
	docsrv.sco.com /SDK_sysprog/PM_ProcTerm.html (403 words)

	OSXFAQ :: View topic - The Zombie Process
		Zombie processes are due to bugs in kernal mode SW, ususally in drivers.
		When you see a bunch of zombies hanging around, it means that a sloppy programmer has been forking new processes, but is not collecting their exit states.
		Process Viewer does report the PPID number, and sometimes the name of the parent process (e.g., Windows Manager), but it's unclear to me what to do with with this information, or how to discover the parent process if only the number is reported for a zombie.
	forums.osxfaq.com /viewtopic.php?t=4608 (1756 words)

	[Smaug] Dumb zombie question (Site not responding. Last check: 2007-10-09)
		Long answer: A zombie process is one that is defunct and in truth isn't really there anymore, and has terminated and relinquished all machine resources, but remains as an entry in the process table because its parent process is in a wait() state, waiting to hear from it.
		Zombie processes are indicated by "Z" in the ps command's status field.
		Hypothetically, if the process table accumulates huge numbers of defunct processes, eventually, the kernel will reach its maximum process count, and misbehave until you reboot.
	www.svlug.org /archives/smaug/2002q2/000639.html (236 words)

	linux - zombie - The vBulletin Fans Network (Site not responding. Last check: 2007-10-09)
		The kernel then releases all system resources previously used by the process, but saves the exit status and process ID. The process is now in the zombie process state.
		The process remains a zombie process until its parent process checks the exit status and tells the kernel to completely delete the process.
		Process ID 311 has a STAT (status) of Z indicating that it is a zombie process.
	www.vbulletin.nl /showthread.php?t=3689 (393 words)

	Zombie Process - Waikato Linux Users Group
		Often, the parent process does a wait4(2) system call, which means it waits for the child process to finish.
		If you don't care when the process finishes, you have to explicitly say so, otherwise the kernel will keep the info in the process table expecting your process to eventually call wait4(2) or a similar function.
		A process that has finished (and so is using no memory) but has not yet been "reaped" is called a Zombie, and the kernel is keeping its process table entry alive.
	www.wlug.org.nz /ZombieProcess (308 words)

	dBforums - 1. Are defunct & zombie same? 2.Why should they figure in 'ps' listing?
		Defunct process is the one which is an already dead one ie.
		Zombies are still in the process table and it's important to be able to
		A zombie is not quite dead (it is one of the "undead").
	www.dbforums.com /showthread.php?t=665289 (1422 words)

	The UNIX Forums - Zombie process
		In the interval between the child terminating and the parent calling wait(), the child is said to be a `zombie'.
		A zombie is a process that has sucessfully exited.
		The process table entry must be maintained until its parent issues a wait() system call and retrieves the exit status.
	www.unix.com /showthread.php?t=5923 (483 words)

	docs.sun.com: man pages section 2: System Calls (Site not responding. Last check: 2007-10-09)
		The parent process ID of all of the calling process's existing child processes and zombie processes is set to 1.
		If the process is a controlling process, the controlling terminal associated with the session is disassociated from the session, allowing it to be acquired by a new controlling process.
		If the current process is the last process within its task and if the system's extended task accounting facility is enabled (see acctadm(1M)), an extended accounting record is written to the extended task accounting file.
	docs.sun.com /db/doc/816-0212/6m6nd4n94?a=view (642 words)

	[No title] (Site not responding. Last check: 2007-10-09)
		child process is almost exact duplicate of the parent child process inherits parents code, data, stack, open files and signals if fork succeeds, it returns the PID of the child to the parent process, and returns 0 to the child process.
		When a child process terminates with exit(), it sends SIGCHLD signal waits for its termination status to be accepted A process that is waiting for its parent process to accept its return code is called ZOMBIE process.
		If the child process ‘s parent is alive but never executes a wait on it, the processes return code will not be accepted and the child process will remain a zombie.
	www.cs.fredonia.edu /~arnavut/classes/cs231/system.doc (1645 words)

	Diary for johnnyb
		A zombie process is a process that has terminated, but has not been "waited" on by its parent.
		The operating system keeps it in the process table as a zombie process so it retains it's records, and it just waits there until it's parent calls wait().
		Zombies don't use CPU time, because they are not running.
	www.advogato.org /person/johnnyb/diary.html?start=31 (1388 words)

	[SDBUG] process listed, kill, no such process?! (Site not responding. Last check: 2007-10-09)
		Zombies are processes that have died, but the parent process wanted to be notified on child death.
		The zombie lingers until the parent is notified.
		The zombie should then get re-parented to init, which will note the child's death, releasing the zombie.
	www.sdbug.org /pipermail/sdbug/2003-March/002219.html (267 words)

	UNIX man pages : exit (2) (Site not responding. Last check: 2007-10-09)
		flag (see sigaction(2)), the calling process is transformed into a "zombie process." A zombie process is a process that only occupies a slot in the process table.
		If the parent process of the calling process is executing wait(2) or waitpid(2), then it is noti- fied of the calling process's termination and the low-order eight bits of
		is saved for return to the parent process whenever the parent process executes an appropriate subse- quent wait(2) or waitpid(2).
	www.phy.ohiou.edu /cgi-bin/man-cgi.sol?exit+2 (423 words)

	Comments on 5969 \| Ask MetaFilter (Site not responding. Last check: 2007-10-09)
		To expand a bit: Zombies are processes that have exited, but have not been reaped yet.
		Ok, I should be able to spawn zombie processes by losing the wait argument...how can I write a snippet that generates zombies?" and that's as far as I got.
		The disclaimer in the post, which wasn't well phrased, was meant so that people didn't think I was actually trying to write code that would spawn zombie "processes" that could bog down a system...but I was trying to write silly code that purported to generate "actual" zombies...as in the shuffling, brain-eating variety.
	ask.metafilter.com /mefi/5969 (1017 words)

	Debian Administration :: Finding zombie processes
		If you have a server which is not working very well, it is posible that the process that you want to use is in a zombie state.
		You can see that there is a zombie process with top for example.
		The zombie process only contains the return value of the child, the parent should normally wait for that return value..
	debian-administration.org /articles/261 (567 words)

	Module: Process
		In this first example, we don’t reap the first child process, so it appears as a zombie in the process status display.
		Returns the process group ID for the given process id. Not available on all platforms.
		Establishes this process as a new session and process group leader, with no controlling tty.
	www.ruby-doc.org /core/classes/Process.html (1199 words)

	Kiskeyix :: Guru Guidance: Zombie Process
		In order for it to "go away" (be removed from the process table, its parent must do a wait() system call or one of its variants.
		The ultrasecret reason for this is that the zombie contains some statistics on the process such as the exit status (why it died) and CPU time used that must be returned to the parent and this is stored in -- guese where -- the zombie's per-process structure.
		Maybe the program is leaking memory (which you could see with a program call "valgrind") or you don't have enough physical ram and your swap partition is running on a corrupted portion of the drive.
	www.latinomixed.com /article.php?story_id=129 (958 words)

	SIGCHLD, fork() and sleep()
		As I ignore SIGCHLD signal the children wont notify the parent process of their termination, so no wait() to collect status of their termination is needed and no processes should turn into Zombies.
		If i quickly fork children processes and quickly exit then after the children have terminated and parent is sleep()ing I see a single Zombie process.
		I mean there is a the parent process which Sleeps and a single child process which is Zombie.
	www.webservertalk.com /message72022.html (1311 words)

	"Top" reports "1 Stuck" - The macosxhints Forums
		The stuck process went away after removing the Palm loaded items from the login items list under the login system prefs.
		Since these are "stuck" or "unresponsive" or "zombies" they have lost their normal handles to enable you to manipulate them from the OS so 'normal' procedures such as 'kill' or even 'kill -9' won't work.
		after observing top and ps axl during large job runs, these states come and go and may be an abberation of a process like ps or top that pass thru the process table while the other processes are in an indeterminate state.
	forums.macosxhints.com /showthread.php?t=624 (644 words)

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