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Subject: Re: 5.6-rc7: Xorg hangs, too
From:   Chris Wilson <chris@chris-wilson.co.uk>
To:     Pavel Machek <pavel@ucw.cz>, intel-gfx@lists.freedesktop.org,
        jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com,
        kernel list <linux-kernel@vger.kernel.org>,
        rodrigo.vivi@intel.com
Message-ID: <158586454333.5852.17002169517772810041@build.alporthouse.com>
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Date:   Thu, 02 Apr 2020 22:55:43 +0100
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Quoting Pavel Machek (2020-04-02 22:35:07)
> [258096.980089] 3 locks held by kswapd0/1034:
> [258096.980096]  #0: ffffffff85851c80 (fs_reclaim){....}, at: __fs_reclaim_acquire+0x0/0x30
> [258096.980114]  #1: ffffffff85850b40 (shrinker_rwsem){....}, at: shrink_slab.constprop.79+0x38/0x270
> [258096.980130]  #2: ffff888197278b90 (&vm->mutex){....}, at: i915_vma_unbind+0x90/0xe0
> [258096.980177] 3 locks held by Xorg/3123:
> [258096.980183]  #0: ffff8881972700c8 (&dev->struct_mutex){....}, at: i915_gem_do_execbuffer+0x690/0x1ef0
> [258096.980200]  #1: ffff88819576e950 (&ctx->mutex){....}, at: eb_lookup_vmas+0x7d/0xd10
> [258096.980215]  #2: ffff888197278b90 (&vm->mutex){....}, at: i915_vma_pin+0xb4/0x750

That's the pair that's causing the trouble.
-Chris