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RE: Seg faulting cfagent in v.2.1.13

From: Guolin Cheng
Subject: RE: Seg faulting cfagent in v.2.1.13
Date: Thu, 3 Mar 2005 17:47:41 -0800


 Have your machines had prelink turned on? If so, turned it off, and run
"prelink -auv" to unlink all binaries or libraries first.

 From my experience, one out of 10 cfengine will crash with Seg fault
when prelink is on. For these clients, a simple "prelink -auv" fixes it.

 There was another memory-debugging program also felt uneasy with
prelink, I forget its name now but you can google it. Unfortunately
cfengine seems having the problem as well, at least for cfengine

 Give the "prelink -auv" a try first and let us know the result if your
prelink is on.

 Forget my email if you have not installed prelink at all.




-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of Dan
Sent: Thursday, March 03, 2005 5:25 PM
To: David Masterson
Cc: address@hidden
Subject: RE: Seg faulting cfagent in v.2.1.13

Here's what strace has to say just before the seg fault:

poll([{fd=4, events=POLLOUT, revents=POLLOUT}], 1, 0) = 1
send(4, "/n\1\0\0\1\0\0\0\0\0\0\10macgyver"..., 42, 0) = 42
poll([{fd=4, events=POLLIN, revents=POLLIN}], 1, 5000) = 1
ioctl(4, FIONREAD, [58])                = 0
recvfrom(4, "/n\205\200\0\1\0\1\0\0\0\0\10macgyver"..., 1024, 0,
{sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("xxx.xx.xx.xx")}, [16]) = 58
close(4)                                = 0
write(2, "\320\305\376\277\33", 5?     = 5
write(2, ": ", 2: )                       = 2
write(2, "Successful return: 0", 20Successful return: 0)    = 20
write(2, "\n", 1
)                       = 1
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++


Dan Gilbert, GCIH, MCSE, CCA
Sr. Systems Engineer
Advanced iTV Systems/Production Operations
Digeo, Inc.

-----Original Message-----
From: David Masterson [mailto:address@hidden 
Sent: Thursday, March 03, 2005 5:22 PM
To: Dan Gilbert
Cc: address@hidden
Subject: Re: Seg faulting cfagent in v.2.1.13

You could try 'strace'

David Masterson
Symbol Technologies

>>> "Dan Gilbert" <address@hidden> 03/03/05 04:58PM >>>
Kind folks of the list -- 
I've been trying to set up a new cfengine installation, now that I
finally have time to do so (though I've needed it for months), I am
running into a seg fault situation when running cfagent on a client
Both the client and master machines are running Red Hat EL3 with the
2.4.21-27.0.2 kernel and the binaries were built with gcc-3.2.3-49 and
It looks like things run just fine as the process generates a return
code of 0, but then cfagent seg faults and nothing seems to have
Any thoughts? My cursory scan of the list archives didn't find anything,
though I may not have seen everything, either. Below is the gdb trace as
prescribed on the cfwiki.org site (pruned to the area just before the
seg fault): 
(gdb) bt 
#0 LastSeen (hostname=0xbfff1460 "macgyver", role=cf_connect) 
  at ip.c:422 
#1 0x0805cb57 in RemoteConnect (host=0xbfff1460 "macgyver", 
  forceipv4=110 'n') at ip.c:192 
#2 0x0805a828 in OpenServerConnection (ip=0x94e69c0) at client.c:57 
#3 0x08055081 in MakeImages () at do.c:2425 
#4 0x0804d8c8 in DoTree (passes=1, info=0x80a55f8 "Update") at
#5 0x0804b32a in main (argc=-1218542592, argv=0xb75e8400) at
#6 0x004d679d in ?? () 
#7 0x00000002 in ?? () 
#8 0xbfffb614 in ?? () 
#9 0xbfffb620 in ?? () 
#10 0x00000000 in ?? () 

Dan Gilbert, GCIH, MCSE, CCA
Sr. Systems Engineer
Advanced iTV Systems/Production Operations
Digeo, Inc.

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