graceful restart occasionally gives "could not bind" error

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Hi,

With an apache 2.2 running on FreeBSD, I occasionally get a problem
with a graceful restart.
Issuing the command apachectl graceful results in these messages in
the error log:

[Wed May 26 14:45:48 2010] [notice] Graceful restart requested, doing restart
[Wed May 26 14:45:53 2010] [warn] module dav_module is already loaded, skipping
[Wed May 26 14:45:53 2010] [crit] (22)Invalid argument: make_sock: for
address [::]:443, apr_socket_opt_set: (IPV6_V6ONLY)
(48)Address already in use: make_sock: could not bind to address 0.0.0.0:443
no listening sockets available, shutting down

or this

[Wed May 26 15:02:52 2010] [notice] Graceful restart requested, doing restart
[Wed May 26 15:02:57 2010] [warn] module dav_module is already loaded, skipping
(48)Address already in use: make_sock: could not bind to address [::]:443



This error is not systematic, but it makes the command unreliable and
unusable in a cron task.

Any hint as to what causes this problem?

Thanks in advance!

Raph



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