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897e382d9d
This fixes TC's buffer invalidation code for buffers that are shared between contexts. TC is unable to notify other TCs in case it replaces a shared buffer's underlying storage when invalidating, causing those other TCs to use wrong buffer IDs for busyness tracking, which leads to corruption due to invalidation fast-paths being triggered when they shouldn't be. This patch addresses this issue by tracking if a buffer is shared, and if it is, disabling buffer storage replacement for the affected buffer. This is achieved by tracking which TC instance first accessed a certain buffer. If a second instance then accesses it as well, it will realize that it isn't the only one working on the buffer and mark the buffer accordingly. If TC needs to invalidate a buffer for the correctness of an operation at any point, it will fall back to doing the operation in a synchronous fashion with this patch if the buffer is shared and currently busy. It might be possible to later detect that a buffer has become un-shared; however, this is outside of the scope of this bugfix patch. v2: Do not disable buffer busyness tracking for shared buffers. Fixes: |
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