panic with ZERO_COPY_SOCKETS on 5.4 (and probably 6.0)

Kris Kennaway kris at
Wed Mar 15 18:23:37 UTC 2006

On Wed, Mar 15, 2006 at 06:37:31PM +0600, Vadim Goncharov wrote:
> Hello freebsd-stable,
>   I've seen several panics on a 5.4-STABLE (RELENG_5 at end of January)
>   under moderate ftpd/samba load with diagnostic:
>     vm_page_free: freeing wired page
>   Server rebooted after a panic every ~4 hours. Removing
>   ZERO_COPY_SOCKETS from kernel config resolved problem.
>   And I've found same diagnostic with same causes in freebsd-current@
>   mail lists on a 6.0-RC1:
>   Also, there is a PR with a similar diagnostic (but not sure if it is
>   ZERO_COPY_SOCKETS problem):
>   I still have coredumps on my machine together with copy of
>   kernel.debug (although I've updated machine to 5.5-PRERELEASE alredy),
>   and can provide backtrace etc. if somebody will be interested in this.

There were fixes for this after 6.0.  I don't know if anyone is
interested in merging the fixes to 5.5; you should update to 6.1 for
this and many other reasons.

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