From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jacob Gorm Hansen <jacobg@diku.dk>
Subject: Xenbus watch firing over and over
Date: Wed, 03 Jan 2007 19:16:03 +0100
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hi,
I am trying to add xenbus watch support to mini-os, but am getting into
a endless loop of watches firing over and over. Below is an excerpt from
the xenstore tracefile:

IN  0x805acc8 20070103 19:32:18 WATCH
(/local/domain/0/backend/vif/26/0/state 00043818 )
CREATE watch 0x805a8b8
OUT 0x805acc8 20070103 19:32:18 WATCH (OK )
OUT 0x805acc8 20070103 19:32:18 WATCH_EVENT
(/local/domain/0/backend/vif/26/0/state 00043818 )
IN  0x805acc8 20070103 19:32:18 UNWATCH
(/local/domain/0/backend/vif/26/0/state 00043818 )
DESTROY watch 0x805a8b8
OUT 0x805acc8 20070103 19:32:18 UNWATCH (OK )
IN  0x805acc8 20070103 19:32:18 READ
(/local/domain/0/backend/vif/26/0/state )
OUT 0x805acc8 20070103 19:32:18 READ (5)
IN  0x805acc8 20070103 19:32:18 WATCH
(/local/domain/0/backend/vif/26/0/state 00043818 )
CREATE watch 0x806af60
OUT 0x805acc8 20070103 19:32:18 WATCH (OK )
OUT 0x805acc8 20070103 19:32:18 WATCH_EVENT
(/local/domain/0/backend/vif/26/0/state 00043818 )
IN  0x805acc8 20070103 19:32:18 UNWATCH
(/local/domain/0/backend/vif/26/0/state 00043818 )
DESTROY watch 0x806af60
OUT 0x805acc8 20070103 19:32:18 UNWATCH (OK )
IN  0x805acc8 20070103 19:32:18 READ
(/local/domain/0/backend/vif/26/0/state )
OUT 0x805acc8 20070103 19:32:18 READ (5)
IN  0x805acc8 20070103 19:32:18 WATCH
(/local/domain/0/backend/vif/26/0/state 00043818 )

...

The same watch seems to be firing again and again, even though noone
appears to be writing it. Should I some ack the watch, or is this a bug
in xenstored?

This is with Xen 3.0.3.

Regards,
Jacob