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stenyak's avatar
stenyak
Protege
2 years ago

Nullpointer crash during xrCreateSession inside oculus drivers (LibOVRRT64_1.dll) using OpenXR on PC

Hi, I've integrated OpenXR in my custom game engine. It works fine when I use my Oculus headset using SteamVR as the OpenXR runtime. However, when using Oculus as the OpenXR runtime, I get a null...
OpenXR
openxr xrcreatesession
OVR
PCVR
johnkearney's avatar
johnkearney
Meta Employee
2 years ago

Thanks for reporting stenyak.

I don't know if a core dump would help very much unless you can supply symbols for your binary too?

Otherwise, maybe you let me know the data supplied in the XrSessionCreateInfo parameter?

  • stenyak's avatar
    stenyak
    Protege
    2 years ago

    Ok, just in case, here's the api dump of both xrCreateInstance, and the (crashing) xrCreateSession:

    XrResult xrCreateInstance
    const XrInstanceCreateInfo* info = 0x00000002250fe208
    XrStructureType info->type = 3
    const void * info->next = 0x0000000000000000
    XrInstanceCreateFlags info->createFlags = 0
    XrApplicationInfo info->applicationInfo = 0x00000002250fe220
    char* info->applicationInfo->applicationName = redacted
    uint32_t info->applicationInfo->applicationVersion = 0x493e0
    char* info->applicationInfo->engineName = redacted
    uint32_t info->applicationInfo->engineVersion = 0x493e0
    XrVersion info->applicationInfo->apiVersion = 0x1000000000017
    uint32_t info->enabledApiLayerCount = 0x2
    const char* const* info->enabledApiLayerNames = 0x00000002250FE778
    const char* const* info->enabledApiLayerNames[0] = XR_APILAYER_LUNARG_core_validation
    const char* const* info->enabledApiLayerNames[1] = XR_APILAYER_LUNARG_api_dump
    uint32_t info->enabledExtensionCount = 0x1
    const char* const* info->enabledExtensionNames = 0x0000017490BA9080
    const char* const* info->enabledExtensionNames[0] = XR_KHR_vulkan_enable
    XrInstance* instance = 0x00000002250fdab8

    XrResult xrCreateSession
    XrInstance instance = 00007B4400000001
    const XrSessionCreateInfo* createInfo = 0x00000002250feac8
    XrStructureType createInfo->type = XR_TYPE_SESSION_CREATE_INFO
    const void * createInfo->next = 0x00000002250fec90
    const XrGraphicsBindingVulkanKHR* createInfo->next = 0x00000002250fec90
    XrStructureType createInfo->next->type = XR_TYPE_GRAPHICS_BINDING_VULKAN_KHR
    const void * createInfo->next->next = 0x0000000000000000
    VkInstance createInfo->next->instance = 000001743FEE10D0
    VkPhysicalDevice createInfo->next->physicalDevice = 0000017443EECA20
    VkDevice createInfo->next->device = 000001744400E1A0
    uint32_t createInfo->next->queueFamilyIndex = 0x0
    uint32_t createInfo->next->queueIndex = 0x0
    XrSessionCreateFlags createInfo->createFlags = 0
    XrSystemId createInfo->systemId = 14
    XrSession* session = 0000017444036EC8

    • johnkearney's avatar
      johnkearney
      Meta Employee
      2 years ago

      It's a bit surprising that `queueFamilyIndex` and `queueIndex` are 0 but that shouldn't cause a NULL pointer dereference. I don't think there is much that I can do without a crash dump (with pdb).

      • stenyak's avatar
        stenyak
        Protege
        2 years ago

        I'll check if I can provide symbols for my binary, although I assumed my dump together with your DLL's symbols (that I presume you have) would be enough to debug the nullptr.