Date: Sun, 24 Jan 1999 04:06:48 +0800 From: Peter Wemm <peter@netplex.com.au> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: current@FreeBSD.ORG Subject: Re: panic: found dirty cache page 0xf046f1c0 Message-ID: <199901232006.EAA00970@spinner.netplex.com.au> In-Reply-To: Your message of "Sat, 23 Jan 1999 11:55:49 PST." <199901231955.LAA48625@apollo.backplane.com>
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Matthew Dillon wrote:
[..]
> :Oh, one other thing that occurred to me.. Under 4.0-current, I regularly
> :(ie: within 30 seconds of boot) get if_de tranmitter underflows. My
> :console corruption was happening at the instant that de0 was being
> :configured with ifconfig. exmh is running to a remote display over that
> :de0 interface.
> :
> :Under Jan 16 3.0-current, I do not get that tranmitter underflow..
> :
> :The only thin I can think of about if_de that's unusual that is VM related
> :(apart from the complexity of the code) is that it uses configmalloc(). I
> :wonder if this is somehow setting the scene for the later failures? It's
> :certainly suspicious that has done strange things when being ifconfig'ed,
> :including things like trashing the serial console on no less than a dozen
> :occasions.
> :
> :Cheers,
> :-Peter
>
> Hmmm.. HMMMMMM. contigmalloc, eh? You might be onto something here.
> I will investigate it.
>
> The problem was are having is that, somehow, a vm_page_t in the PQ_CACHE
> is being set dirty.
>
> Sinc vm_page_cache() panics if m->dirty is set, then m->dirty must be get
ting
> set *after* the page has been moved to the cache.
>
> contigmalloc() looks suspicious.
Damn, I must be loosing my mind. if_de doesn't use contigmalloc.. it
either did, or was going to as a result of the problem of the transmit
descriptor array crossing a page boundary that had to be contiguous. In
the end there were two seperate malloc's, each less than PAGE_SIZE.
Cheers,
-Peter
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