On Thu, Jan 25, 2018 at 09:10:48PM +0100, Wilfried Klaebe wrote: > On Wed, Jan 24, 2018 at 07:35:45PM +0100, Lukas Wunner wrote: > > * Wilfried Klaebe reports a deadlock when launching Xorg because it > > opens /dev/vga_arbiter and calls vga_get(), but apple-gmux is holding > > a lock on I/O space indefinitely. It looks like apple-gmux' current > > behavior is an abuse of the vgaarb API as locks are not meant to be > > held for longer periods: > > https://bugzilla.kernel.org/show_bug.cgi?id=88861#c11 > > https://bugzilla.kernel.org/attachment.cgi?id=217541 [...] > I see warnings about possible circular locking regarding vgasr_mutex, > but haven't had a deadlock yet. I'd be happy to provide more information > as timely as job and family allow. Could you attach dmesg output with that lockdep splat to the above-quoted bugzilla entry? Thanks, Lukas
