Commit cf02415e for whisper.cpp

commit cf02415e29e9daa30c5387209fd45e5299af9bca
Author: losewayy <1134285612@qq.com>
Date:   Thu Oct 15 16:37:35 2026 +0800

    vulkan : fix concurrent first device init (llama/29766)

    * vulkan : fix concurrent first device init

    * tests : load models in parallel in test-thread-safety

    Loading them serially never exercised concurrent first backend init, so the crash reported in #29764 was invisible to this test.

    * vulkan : create fence before retaining device in buffer context

diff --git a/ggml/src/ggml-vulkan/ggml-vulkan.cpp b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
index 42057114..436bfe3b 100644
--- a/ggml/src/ggml-vulkan/ggml-vulkan.cpp
+++ b/ggml/src/ggml-vulkan/ggml-vulkan.cpp
@@ -3990,10 +3990,12 @@ void ggml_vk_load_shaders(vk_device& device, vk_pipeline requested) {
 vk_device ggml_vk_get_device(size_t idx) {
     VK_LOG_DEBUG("ggml_vk_get_device(" << idx << ")");

+    static std::mutex mutex;
+    std::lock_guard<std::mutex> lock(mutex);
+
     if (vk_instance.devices[idx] == nullptr) {
         VK_LOG_DEBUG("Initializing new vk_device");
         vk_device device = std::make_shared<vk_device_struct>();
-        vk_instance.devices[idx] = device;

         device->memory_logger = std::unique_ptr<vk_memory_logger>(new vk_memory_logger());

@@ -4891,14 +4893,14 @@ vk_device ggml_vk_get_device(size_t idx) {
             device->async_use_transfer_queue = false;
         }

+        device->fence = device->device.createFence({});
+
         device->buffer_type = {
             /* .iface    = */ ggml_backend_vk_buffer_type_interface,
             /* .device   = */ ggml_backend_reg_dev_get(ggml_backend_vk_reg(), idx),
             /* .context  = */ new ggml_backend_vk_buffer_type_context{ device->name, device },
         };

-        device->fence = device->device.createFence({});
-
         device->idx = idx;

         device->serialize_submissions = getenv("GGML_VK_SERIALIZE_SUBMISSIONS") != nullptr;
@@ -4920,6 +4922,9 @@ vk_device ggml_vk_get_device(size_t idx) {
             device->mmvq_mode = 1;
         }

+        // publish the device only when it is fully built
+        vk_instance.devices[idx] = device;
+
         return device;
     }

@@ -16463,6 +16468,11 @@ void vk_queue_handle_unsynchronized::submit(vk::ArrayProxy<const vk::SubmitInfo>
 }

 vk_device_struct::~vk_device_struct() {
+    // the build failed before the device was created, nothing to destroy
+    if (device == VK_NULL_HANDLE) {
+        return;
+    }
+
     VK_LOG_DEBUG("destroy device " << name);

     device.destroyFence(fence);