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Date:      Wed, 9 Jun 1999 15:11:43 -0300 (ADT)
From:      The Hermit Hacker <scrappy@hub.org>
To:        "David E. Cross" <crossd@cs.rpi.edu>
Cc:        freebsd-current@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG
Subject:   Re: MMAP() in STABLE/CURRENT ... 
Message-ID:  <Pine.BSF.4.05.9906091509450.49155-100000@thelab.hub.org>
In-Reply-To: <199906091754.NAA34746@cs.rpi.edu>

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On Wed, 9 Jun 1999, David E. Cross wrote:

> I believe I stumbled over this as well.   (As a side note, you can run DDB
> over a serial console too, just compile with DDB, and DDB_UNATTENDED so your
> system will come back if it unexpectedly panics; on the serial console send
> a 'break').

And today's trick question...how do you send a break? :(  I'm telnet'd
into a Livingston Portmaster, with 'telnet -E' to disable the telnet
break...I have DDB and DDB_UNATTENDED enabled and running right now, so if
I can get this break issue working, then I'm all set for the next time if
it happens :)

> Anyway, I have a simple program that mmap()s a 1Gig file into memory, 
> madvise()s it that it will be doing random access.  If I quit and restart
> this program a couple of times (yes, it close()s and munmap()s the segment),
> my system will hard lock.  By dropping into DDB once I found that it was
> stuck in 'vm_somethingorother_choosepage'.  Does this ring any bells?  Should
> I try to stop my system again?

Just to prepare myself, if/when I get that break to work...you just did a
'trace', or is there something else I'll want to do in DDB?

Marc G. Fournier                   ICQ#7615664               IRC Nick: Scrappy
Systems Administrator @ hub.org 
primary: scrappy@hub.org           secondary: scrappy@{freebsd|postgresql}.org 



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