On Thu, Jan 21, 2016 at 01:34:57AM +0200, Andriy Gapon wrote: > On 20/01/2016 22:03, Alan Somers wrote: > > On Wed, Jan 20, 2016 at 2:20 AM, Andriy Gapon <a...@freebsd.org> wrote: > >> On 19/01/2016 19:20, Alan Somers wrote: > >>> The thing is, it never really worked in the first place. Panics and > >>> deadlocks are so frequent that I don't think the feature was usable > >>> for anybody. > >> > >> The feature is perfectly usable for me. I have never run into the > >> problems that > >> you describe. Why not fix the real bugs that you've run into? > > > > Spectra Logic and iXSystems both experienced many problems with this. > > The worst is a deadlock that can be triggered simply by pulling a > > drive from a redundant pool when there exists a zvol anywhere in the > > system (see https://reviews.freebsd.org/D4998 for a quick way to > > reproduce). Fixing it correctly would likely require far more time > > than I have available. I just want the bugs to go away. See that > > same code review for a change to make the feature optional. > > I think that we all want all the bugs to go way. One way to remove bugs is to > remove (disable) code that contains bugs. That way the perfect bug-free > software is clearly achievable :-) Unfortunately, that technique is not > always > welcomed. > > P.S. > I think that the real problem here is that a method of a geom must never drop > topology_lock. In other words, the GEOM management code (like g_xxx() stuff > in > geom_subr.c) expects that a topology can not change underneath it. But > zvol_geom_access() clearly breaks that contract.
May be same cause problem with swap on zvol (don't test on latest -stable)? _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
