Re: [PATCH] Revert "drm/i915: Propagate errors on awaiting already signaled fences"

Quoting Jason Ekstrand (2021-03-05 17:05:46)

This reverts commit 9e31c1fe45d555a948ff66f1f0e3fe1f83ca63f7. Ever since that commit, we've been having issues where a hang in one client can propagate to another. In particular, a hang in an app can propagate to the X server which causes the whole desktop to lock up.

The fence error handling is required to prevent user's circumventing incomplete work, such as security validation or escaping isolation. -Chris