On Wednesday 21 March 2012 06:07 am, Konstantin Belousov wrote: > On Tue, Mar 20, 2012 at 08:37:23PM +0000, Jung-uk Kim wrote: > > Author: jkim > > Date: Tue Mar 20 20:37:23 2012 > > New Revision: 233249 > > URL: http://svn.freebsd.org/changeset/base/233249 > > > > Log: > > Fix another witness panic. We cannot enter critical section at > > all because AcpiEnterSleepState() executes (optional) _GTS method > > since ACPICA 20120215 (r231844). To evaluate the method, we need > > malloc(9), which may sleep. > > You papered over the issue, and not fixed it.
Yes, it is a stopgap. > If sleep may happen, as it is for malloc, you cannot sleep with > interrupts turned off. This would cause a deadlock at best. I am well aware of the problem. In fact, that's why I had to merge ACPICA 20120320 rather quickly, which added a new flag to not execute _GTS method. Both _GTS and _BFS are turned off by default. You can control them with a new tunable "debug.acpi.sleep_flags" if you want. Please see the updated acpi(4). Jung-uk Kim _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
