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Vulkan backend deadlocks on startup (Debian Testing + Nvidia GPU) #129160

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opened 2024-10-17 14:38:49 +02:00 by Bastien Montagne · 3 comments
Bastien Montagne commented 2024-10-17 14:38:49 +02:00
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System Information
Operating system: Debian Testing
Graphics card: Nvidia RTX A4500 (drivers 535.183).

Blender Version
Broken: main

Short description of error

Blender will deadlock when started with the Vulkan backend. UI shows up, but is totally unresponsive (only a few main loops happen).

Exact steps for others to reproduce the error

From debugger it seems that the code is locked on the infinite loop in VKCommandBufferWrapper::wait_for_cpu_synchronization:

1  poll                                                                                                               0x7f33f600a11f 
2  ??                                                                                                                 0x7f33927157f3 
3  ??                                                                                                                 0x7f3392b243b9 
4  ??                                                                                                                 0x7f3392a54b40 
5  blender::gpu::render_graph::VKCommandBufferWrapper::wait_for_cpu_synchronization vk_command_buffer_wrapper.cc 103  0x8315d50      
6  blender::gpu::VKContext::flush_render_graph                                      vk_context.cc                148  0x82faa9e      
7  blender::gpu::VKContext::deactivate                                              vk_context.cc                126  0x82faa9e      
8  GPU_context_active_set                                                           gpu_context.cc               144  0x82001d4      
9  GPU_viewport_bind                                                                gpu_viewport.cc              204  0x82cf133      
10 wm_draw_region_bind                                                              wm_draw.cc                   751  0x33e397e      
11 wm_draw_window_offscreen                                                         wm_draw.cc                   1005 0x33e397e      
12 wm_draw_window                                                                   wm_draw.cc                   1177 0x33e397e      
13 wm_draw_update                                                                   wm_draw.cc                   1581 0x33e397e      
14 WM_main                                                                          wm.cc                        644  0x33dee28      
15 main                                                                             creator.cc                   588  0x28bc0c5

Also a hotspot capture:

image

**System Information** Operating system: Debian Testing Graphics card: Nvidia RTX A4500 (drivers 535.183). **Blender Version** Broken: main **Short description of error** Blender will deadlock when started with the Vulkan backend. UI shows up, but is totally unresponsive (only a few main loops happen). **Exact steps for others to reproduce the error** From debugger it seems that the code is locked on the infinite loop in `VKCommandBufferWrapper::wait_for_cpu_synchronization`: ``` 1 poll 0x7f33f600a11f 2 ?? 0x7f33927157f3 3 ?? 0x7f3392b243b9 4 ?? 0x7f3392a54b40 5 blender::gpu::render_graph::VKCommandBufferWrapper::wait_for_cpu_synchronization vk_command_buffer_wrapper.cc 103 0x8315d50 6 blender::gpu::VKContext::flush_render_graph vk_context.cc 148 0x82faa9e 7 blender::gpu::VKContext::deactivate vk_context.cc 126 0x82faa9e 8 GPU_context_active_set gpu_context.cc 144 0x82001d4 9 GPU_viewport_bind gpu_viewport.cc 204 0x82cf133 10 wm_draw_region_bind wm_draw.cc 751 0x33e397e 11 wm_draw_window_offscreen wm_draw.cc 1005 0x33e397e 12 wm_draw_window wm_draw.cc 1177 0x33e397e 13 wm_draw_update wm_draw.cc 1581 0x33e397e 14 WM_main wm.cc 644 0x33dee28 15 main creator.cc 588 0x28bc0c5 ``` Also a hotspot capture: ![image](/attachments/517cf83e-17ca-422d-9d04-23f6068d4660)
image.png
514 KiB
Jeroen Bakker commented 2024-11-07 10:29:25 +01:00
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A deadlock can happen when the device is lost (driver reset/restart). On NVIDIA this can be the case.
What would help would be to use vkconfig/API dump to see what commands have been executed before it hangs.
Updating to the latest available linux drivers could also solve some issues I use 555.

A deadlock can happen when the device is lost (driver reset/restart). On NVIDIA this can be the case. What would help would be to use vkconfig/API dump to see what commands have been executed before it hangs. Updating to the latest available linux drivers could also solve some issues I use 555.
Bastien Montagne commented 2024-11-07 11:02:30 +01:00
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Here is the massive 11MB dump until UI shows up and freeze forever:

blender.txt

blender.html

Here is the massive 11MB dump until UI shows up and freeze forever: [blender.txt](/attachments/a7198132-b035-47b4-a8ce-83004a390c71) [blender.html](/attachments/ee6b02c6-d530-48f2-9477-aba96d1bb78f)
blender.txt
11 MiB
blender.html
23 MiB
Jeroen Bakker commented 2024-11-07 11:14:49 +01:00
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Hmm.. Seems like the last commands send to the GPU is an empty list. I did some experiments in the past to remove them, but as it complicated the code I didn't continued on it. Perhaps that is failing on this device.

Thread 0, Frame 4:
vkAllocateCommandBuffers(device, pAllocateInfo, pCommandBuffers) returns VkResult VK_SUCCESS (0):
    device:                         VkDevice = 0x7f5,4ed,1f1,150
    pAllocateInfo:                  const VkCommandBufferAllocateInfo* = 0x7f5,4cc,e43,980:
        sType:                          VkStructureType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO (40)
        pNext:                          const void* = NULL
        commandPool:                    VkCommandPool = 0x7f5,4cd,30d,e50
        level:                          VkCommandBufferLevel = VK_COMMAND_BUFFER_LEVEL_PRIMARY (0)
        commandBufferCount:             uint32_t = 1
    pCommandBuffers:                VkCommandBuffer* = 0x7f5,4cc,e43,a28
        pCommandBuffers[0]:             VkCommandBuffer = 0x7f5,4c6,a36,850

Thread 0, Frame 4:
vkBeginCommandBuffer(commandBuffer, pBeginInfo) returns VkResult VK_SUCCESS (0):
    commandBuffer:                  VkCommandBuffer = 0x7f5,4c6,a36,850
    pBeginInfo:                     const VkCommandBufferBeginInfo* = 0x7f5,4cc,e43,9a0:
        sType:                          VkStructureType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO (42)
        pNext:                          const void* = NULL
        flags:                          VkCommandBufferUsageFlags = 1 (VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT)
        pInheritanceInfo:               const VkCommandBufferInheritanceInfo* = UNUSED

Thread 0, Frame 4:
vkEndCommandBuffer(commandBuffer) returns VkResult VK_SUCCESS (0):
    commandBuffer:                  VkCommandBuffer = 0x7f5,4c6,a36,850

Thread 0, Frame 4:
vkResetFences(device, fenceCount, pFences) returns VkResult VK_SUCCESS (0):
    device:                         VkDevice = 0x7f5,4ed,1f1,150
    fenceCount:                     uint32_t = 1
    pFences:                        const VkFence* = 0x7ff,e5e,909,ae8
        pFences[0]:                     const VkFence = 0x7f5,4ee,1f3,450

Thread 0, Frame 4:
vkQueueSubmit(queue, submitCount, pSubmits, fence) returns VkResult VK_SUCCESS (0):
    queue:                          VkQueue = 0x7f5,4ee,1e9,c50
    submitCount:                    uint32_t = 1
    pSubmits:                       const VkSubmitInfo* = 0x7f5,4cc,e43,9d8
        pSubmits[0]:                    const VkSubmitInfo = 0x7f5,4cc,e43,9d8:
            sType:                          VkStructureType = VK_STRUCTURE_TYPE_SUBMIT_INFO (4)
            pNext:                          const void* = NULL
            waitSemaphoreCount:             uint32_t = 0
            pWaitSemaphores:                const VkSemaphore* = NULL
            pWaitDstStageMask:              const VkPipelineStageFlags* = NULL
            commandBufferCount:             uint32_t = 1
            pCommandBuffers:                const VkCommandBuffer* = 0x7f5,4cc,e43,a28
                pCommandBuffers[0]:             const VkCommandBuffer = 0x7f5,4c6,a36,850
            signalSemaphoreCount:           uint32_t = 0
            pSignalSemaphores:              const VkSemaphore* = NULL
    fence:                          VkFence = 0x7f5,4ee,1f3,450
Hmm.. Seems like the last commands send to the GPU is an empty list. I did some experiments in the past to remove them, but as it complicated the code I didn't continued on it. Perhaps that is failing on this device. ``` Thread 0, Frame 4: vkAllocateCommandBuffers(device, pAllocateInfo, pCommandBuffers) returns VkResult VK_SUCCESS (0): device: VkDevice = 0x7f5,4ed,1f1,150 pAllocateInfo: const VkCommandBufferAllocateInfo* = 0x7f5,4cc,e43,980: sType: VkStructureType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO (40) pNext: const void* = NULL commandPool: VkCommandPool = 0x7f5,4cd,30d,e50 level: VkCommandBufferLevel = VK_COMMAND_BUFFER_LEVEL_PRIMARY (0) commandBufferCount: uint32_t = 1 pCommandBuffers: VkCommandBuffer* = 0x7f5,4cc,e43,a28 pCommandBuffers[0]: VkCommandBuffer = 0x7f5,4c6,a36,850 Thread 0, Frame 4: vkBeginCommandBuffer(commandBuffer, pBeginInfo) returns VkResult VK_SUCCESS (0): commandBuffer: VkCommandBuffer = 0x7f5,4c6,a36,850 pBeginInfo: const VkCommandBufferBeginInfo* = 0x7f5,4cc,e43,9a0: sType: VkStructureType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO (42) pNext: const void* = NULL flags: VkCommandBufferUsageFlags = 1 (VK_COMMAND_BUFFER_USAGE_ONE_TIME_SUBMIT_BIT) pInheritanceInfo: const VkCommandBufferInheritanceInfo* = UNUSED Thread 0, Frame 4: vkEndCommandBuffer(commandBuffer) returns VkResult VK_SUCCESS (0): commandBuffer: VkCommandBuffer = 0x7f5,4c6,a36,850 Thread 0, Frame 4: vkResetFences(device, fenceCount, pFences) returns VkResult VK_SUCCESS (0): device: VkDevice = 0x7f5,4ed,1f1,150 fenceCount: uint32_t = 1 pFences: const VkFence* = 0x7ff,e5e,909,ae8 pFences[0]: const VkFence = 0x7f5,4ee,1f3,450 Thread 0, Frame 4: vkQueueSubmit(queue, submitCount, pSubmits, fence) returns VkResult VK_SUCCESS (0): queue: VkQueue = 0x7f5,4ee,1e9,c50 submitCount: uint32_t = 1 pSubmits: const VkSubmitInfo* = 0x7f5,4cc,e43,9d8 pSubmits[0]: const VkSubmitInfo = 0x7f5,4cc,e43,9d8: sType: VkStructureType = VK_STRUCTURE_TYPE_SUBMIT_INFO (4) pNext: const void* = NULL waitSemaphoreCount: uint32_t = 0 pWaitSemaphores: const VkSemaphore* = NULL pWaitDstStageMask: const VkPipelineStageFlags* = NULL commandBufferCount: uint32_t = 1 pCommandBuffers: const VkCommandBuffer* = 0x7f5,4cc,e43,a28 pCommandBuffers[0]: const VkCommandBuffer = 0x7f5,4c6,a36,850 signalSemaphoreCount: uint32_t = 0 pSignalSemaphores: const VkSemaphore* = NULL fence: VkFence = 0x7f5,4ee,1f3,450 ```
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