Fix vkCmdCopyBuffer SYNC-HAZARD-WRITE-AFTER-WRITE error - #1658
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Added a per‑TransferTask fence to serialize transfer submissions so back‑to‑back vkCmdCopyBuffer writes can't overlap on the same queue.
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I have merged this PR as a branch: https://github.com/vsg-dev/VulkanSceneGraph/tree/TP-David-vkCmdCopyBuffer-sync-error-fix I then compared master vs this branch running vsgviewer for 10 frames with the sync on: vsgviewer models/openstreetmap.vsgt --sync -d -f 10 | grep ErrorBut alas the same errors for master and this branch :-| vkQueueSubmit(queue, submitCount, pSubmits, fence) returns VkResultValidation Error: [ SYNC-HAZARD-WRITE-RACING-READ ] | MessageID = pointer
vkQueueSubmit(queue, submitCount, pSubmits, fence) returns VkResultValidation Error: [ SYNC-HAZARD-WRITE-RACING-READ ] | MessageID = pointer
vkQueueSubmit(queue, submitCount, pSubmits, fence) returns VkResultValidation Error: [ SYNC-HAZARD-WRITE-AFTER-READ ] | MessageID = pointer
vkQueueSubmit(queue, submitCount, pSubmits, fence) returns VkResultValidation Error: [ SYNC-HAZARD-WRITE-AFTER-READ ] | MessageID = pointer
vkQueueSubmit(queue, submitCount, pSubmits, fence) returns VkResultValidation Error: [ SYNC-HAZARD-WRITE-AFTER-READ ] | MessageID = pointerNot yet sure of what to make of this. |
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These errors appear when enabling "Synchronization" Layer Configuration in Vulkan Configurator and running vsgtext:
Validation Error: [ SYNC-HAZARD-WRITE-AFTER-WRITE ] | MessageID = 0x5c0ec5d6 vkQueueSubmit(): WRITE_AFTER_WRITE hazard detected. vkCmdCopyBuffer...
Fix:
Added a per‑TransferTask fence to serialize transfer submissions so back‑to‑back vkCmdCopyBuffer writes can't overlap on the same queue.
OS Windows 11
GPU NVIDIA RTX 2000 Ada Generation Laptop GPU
Driver date 10/12/2025
Vulkan 1.4.328.1