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From: John Baldwin <jhb@freebsd.org>
To: freebsd-hackers@freebsd.org
Subject: Re: Glitch with textdump/ddb
Date: Thu, 05 Mar 2015 10:04:33 -0500
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 (bigwig.baldwin.cx); Thu, 05 Mar 2015 10:22:31 -0500 (EST)
Cc: Shrikanth Kamath <shrikanth07@gmail.com>
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On Wednesday, March 04, 2015 01:06:17 AM Shrikanth Kamath wrote:
> But if I change the script to
> ddb script kdb.enter.panic="textdump set; capture on; show pcpu; ps;
> call doadump(1)"
> 
> The value supplied to call doadump when the machine enters debugger
> on panic is now set to '1'.
> 
> Should this be the right way to capture information when using text
> dumps? I guess the man page for textdump specifies just "call
> doadump". The problem may not manifest as long the random value picked
> off the stack is non zero.

Yes, the value should be passed explicitly.  HEAD now has a 'dump' command 
that is preferred to calling doadump directly though.  (Not sure if that 
command has been merged to any stable branches.)

-- 
John Baldwin