Author: emax
Date: Sun Apr 12 19:42:25 2009
New Revision: 190974
URL: http://svn.freebsd.org/changeset/base/190974

Log:
  Add entry about kbdmux(4) un-locking.

Modified:
  head/UPDATING

Modified: head/UPDATING
==============================================================================
--- head/UPDATING       Sun Apr 12 19:41:16 2009        (r190973)
+++ head/UPDATING       Sun Apr 12 19:42:25 2009        (r190974)
@@ -22,6 +22,16 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 8.
        to maximize performance.  (To disable malloc debugging, run
        ln -s aj /etc/malloc.conf.)
 
+20090408:
+       Do not use Giant for kbdmux(4) locking. This is wrong and
+       apparently causing more problems than it solves. This will
+       re-open the issue where interrupt handlers may race with
+       kbdmux(4) in polling mode. Typical symptoms include (but
+       not limited to) duplicated and/or missing characters when
+       low level console functions (such as gets) are used while
+       interrupts are enabled (for example geli password prompt,
+       mountroot prompt etc.). Disabling kbdmux(4) may help.
+
 20090407:
        The size of structs vnet_net, vnet_inet and vnet_ipfw has changed;
        kernel modules referencing any of the above need to be recompiled.
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