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Date: Fri, 7 Apr 2017 01:23:42 +0200 From: Andrea Arcangeli <aarcange@...hat.com> To: Martin Kepplinger <martink@...teo.de>, Thorsten Leemhuis <regressions@...mhuis.info>, daniel.vetter@...el.com, Dave Airlie <airlied@...il.com>, Chris Wilson <chris@...is-wilson.co.uk> Cc: intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org Subject: [PATCH 0/5] Re: [Intel-gfx] [BUG][REGRESSION] i915 gpu hangs under load I'm also getting kernel hangs every couple of days. For me it's still not fixed here in 4.11-rc5. It's hard to reproduce, the best reproducer is to build lineageos 14.1 on host while running LTP in a guest to stress the guest VM. Initially I thought it was related to the fact I upgraded the xf86 intel driver just a few weeks ago (I deferred any upgrade of the userland intel driver since last July because of a regression that never got fixed and broke xterm for me). After I found a workaround for the userland regression (appended at the end for reference) I started getting kernel hangs but they are separate issues as far as I can tell. It's not well tested so beware... (it survived a couple of builds and some VM reclaim but that's it). The first patch 1/5 is the potential fix for the i915 kernel hang. The rest are incremental improvements. And I've no great solution for when the shrinker was invoked with the struct_mutex held and and recurse on the lock. I don't think we can possibly wait in such case (other than flush work that the second patch does) but then practically it shouldn't be a big deal, the big RAM eater is unlikely to be i915 when the system is low on memory. Andrea Arcangeli (5): i915: avoid kernel hang caused by synchronize rcu struct_mutex deadlock i915: flush gem obj freeing workqueues to add accuracy to the i915 shrinker i915: initialize the free_list of the fencing atomic_helper i915: schedule while freeing the lists of gem objects i915: fence workqueue optimization drivers/gpu/drm/i915/i915_gem.c | 15 +++++++++++++++ drivers/gpu/drm/i915/i915_gem_shrinker.c | 15 +++++++++++---- drivers/gpu/drm/i915/intel_display.c | 7 ++++--- 3 files changed, 30 insertions(+), 7 deletions(-) === Userland workaround for unusable xterm after commit 3d3d18f086cdda72ee18a454db70ca72c6e3246c (unrelated to this kernel issue, just for reference of what I'm running in userland). diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c index 11beb90..d349203 100644 --- a/src/sna/sna_accel.c +++ b/src/sna/sna_accel.c @@ -17430,11 +17430,15 @@ sna_flush_callback(CallbackListPtr *list, pointer user_data, pointer call_data) { struct sna *sna = user_data; +#if 0 if (!sna->needs_dri_flush) return; +#endif sna_accel_flush(sna); +#if 0 sna->needs_dri_flush = false; +#endif } static void
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