conf/56031: ipfw hangs on every invocation

[James F. Hranicky]

The following reply was made to PR conf/56031; it has been noted by GNATS.

From: "James F.  Hranicky" <jfh at cise.ufl.edu>
To: Robert Watson <rwatson at FreeBSD.org>
Cc: FreeBSD-gnats-submit at FreeBSD.org, admin at cise.ufl.edu,
	freebsd-bugs at FreeBSD.org
Subject: Re: conf/56031: ipfw hangs on every invocation
Date: Wed, 3 Sep 2003 06:28:09 -0400

 On Tue, 2 Sep 2003 12:10:28 -0400 (EDT)
 Robert Watson <rwatson at FreeBSD.org> wrote:
 
 > 
 > On Tue, 2 Sep 2003, James F.  Hranicky wrote:
 > 
 > > Let me know if I can provide any more info. 
 > 
 > This seems to suggest it's really just the userland application spinning,
 > not a hang in the kernel.  Could you try using truss to see if, once it
 > starts spinning, it's making system calls, or just stuck entirely in
 > userspace?
 
 As far as I can tell it's hanging in the last ioctl() .
 
 > Assuming it's purely a userspace problem (perhaps triggered by
 > syntactically poor output from the kernel), the next thing to do is
 > probably to instrument your ipfw binary with either printfs or debugging
 > symbols and see where in its execution it is spinning.  
 
 I can compile it with debugging symbols and trace through the execution, 
 but it seems like the ioctl() is where it's hanging, again some kind of
 odd terminal thing.
 
 > Could you include a list of your IPFW rules also, please?  
 
 I don't have any set at this time, just the default pass any any. 
 
 I'll trace through it with gdb if you think it will help.
 
 Jim