RE: My process wedges the machine.

Hi Umesh, 
 
I've had similar problems when a process is waiting for children 
it swaned/forked off to finish, and those children hang.  Can you 
check for children of the main, 'wedged' process ('pstree' or similar)? 
Although I would have assumed it's state wouldn't be running if 
it was waiting for a child to die.  Also, are you sure it's the main 
processes that's 'wedged', and not a forked child of it? 
 
Cannot you kill the process with kill, kill -1, kill -14 or kill -9? 
I've not heard of too many non-zombie processess impervious to 
the kill -9 from root?  Maybe you don't have correct permissions? 
 
If you've tried gdb-ing to it, it's probably a C/C++ app, not Java, 
eh?  Maybe you're conditionally forking off a child process, or 
making a db connection isn't closing and your app. is patiently 
waiting. 
 
Hmmm, just some random guesses.  Sorry. 
 
p.s. I've not heard the phrase 'wedged' applied to knackered 
programs before.  Cool, a new term to fob annoying clients off 
with ("Sorry Gale, the program is wedged until Thursday."). 
 
-d.w.
:-)
 

	-----Original Message----- 
	From: Umesh Sisodia [mailto:[email protected]] 
	Sent: Tue 20/05/2003 12:36 
	To: [email protected] 
	Cc: 
	Subject: My process wedges the machine.
	
	

	Hi
	
	We have recently ported our tools to Red hat linux.
	In one of our application we are facing the problem that it wedges
	the machine. Log file shows that process has completed its job, but
	then machine almost hangs.
	
	-Process cannot be killed.
	-process is in run state (not waiting on I/O)
	-process run time keeps incrementing endlessly.
	-process memory size is low (41MB)
	-gdb cannot attach to the process.
	
	This does not happen in every run, but happens randomly once in a
	while. The machine is IBM with 1xCPU (Xeon 2.4MHz) 4GB RAM running
	the RH7.3 BigMem kernel.
	Regards,
	Umesh
	
	
	--
	******************************************************
	Umesh Sisodia (Sr. Member of technical staff)
	Cadence Design Systems, NEPZ, Noida, India
	Ph: (off) 91-120-2562842, ext. 4298
	(mobile) 98112 04168, (Res) 91-120-2578734
	email : [email protected]
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