kern/132827: [vm] [panic] vm_page_free_toq: freeing mapped page

Alan Cox alc at
Fri May 1 17:50:03 UTC 2009

The following reply was made to PR kern/132827; it has been noted by GNATS.

From: Alan Cox <alc at>
To: "Steven G. Kargl" <kargl at>
Cc: bug-followup at
Subject: Re: kern/132827: [vm] [panic] vm_page_free_toq: freeing mapped page
Date: Fri, 01 May 2009 12:41:37 -0500

 Steven G. Kargl wrote:
 > Alan Cox wrote:
 >> There has been no reported re-occurrence of this assertion failure since 
 >> the submitter removed ZERO_COPY_SOCKETS from his kernel configuration.
 > Yes, that is correct.  The panics stopped after removal of
 > ZERO_COPY_SOCKETS.  I'd suggest adding a big warning in
 > the various NOTES files that ZERO_COPY_SOCKETS is broken.
 I will gladly commit appropriately frightening language.  Send me a 
 patch.  :-)

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