On Wed, May 16, 2018 at 9:27 PM, Mark Johnston <[email protected]> wrote: > Author: markj > Date: Thu May 17 04:27:08 2018 > New Revision: 333703 > URL: https://svnweb.freebsd.org/changeset/base/333703 > > Log: > Fix a race in vm_page_pagequeue_lockptr(). > > The value of m->queue must be cached after comparing it with PQ_NONE, > since it may be concurrently changing. > > Reported by: glebius
What were the symptoms of this issue? The test plan in the linked phabricator revision says: "Gleb reported seeing panics as a result of the use of a bogus index into the pagequeue array, and also reported that this patch fixed the panics." So an attempt to lock pagequeues[PQ_NONE=255].pq_mutex, which is either something later in the vm_domain object, or bogus memory? One of the mtx asserts trips? Thanks, Conrad _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
