Date: Thu, 28 Jan 2021 20:49:56 -0500 From: Ed Maste <emaste@freebsd.org> To: freebsd-x11@freebsd.org Subject: i915 intel_frontbuffer_put panic, patch for review/testing Message-ID: <CAPyFy2B-B9wvzCKYCz1LsCgM%2BSoSZzC_F5O0R0HiTgjzWb1bFQ@mail.gmail.com>
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For the last few months I have been experiencing occasional panics from intel_frontbuffer_put(), while running OBS-studio. An excerpt from the backtrace: intel_frontbuffer_put() intel_user_framebuffer_destroy() _drm atomic_helper_plane_destroy_state() drm_atomic_helper_plane_destroy_state() drm_atomic_state_default_clear() intel_atomic_state_clear() __drm_atomic_state_free() intel_atomic_cleanup_work() linux_work_fn() I found a freedesktop.org bug report for an issue that looked related[1]. Unfortunately the patch attached there does not apply to Linux 5.4 corresponding to what we have in drm-kmod[2]. I've backported the patch and applied it against the 5.4-lts branch in the drm-kmod repo, and the issue has not recurred. My patch is in a pull request at [3], and available as a patch file at [4]. Review and/or testing is very much appreciated. [1] https://gitlab.freedesktop.org/drm/intel/-/issues/827 [2] https://lore.kernel.org/stable/15783126692333@kroah.com/ [3] https://github.com/freebsd/drm-kmod/pull/55 [4] https://github.com/freebsd/drm-kmod/commit/b57b441102e9989f5a7d4c9f3c7f29c3790c53f0.patch
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