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+<think>
+Alright, I'm looking at this problem where the user provided a stack trace and some memory leak information from QEMU. The user included a detailed error message with addresses and file paths, which is quite technical.
+
+First, I need to understand what's going on here. The stack trace shows that there's a memory leak occurring during the execution of QEMU. Specifically, AddressSanitizer reports 20 bytes leaked in two allocations. That means somewhere in the code, some memory isn't being freed properly, leading to these leaks.
+
+Looking at the stack trace, I see it starts from `device_set_realized` and goes through several functions like `property_set_bool`, `object_property_set`, etc., all the way up to main loop functions. This suggests that the leak is happening during device addition or some QOM (QEMU Object Model) operation.
+
+I should think about where these functions are used. For example, `qdev_device_add` and `hmp_device_add` imply that this leak happens when adding a new device, possibly via the HMP (Human Monitor Protocol). Maybe there's an issue with how resources are being allocated but not released when a device is added.
+
+I also notice that the stack trace ends in `__libc_start_main`, which indicates that the issue occurs early in the program's execution or during setup. Alternatively, it might be happening frequently enough to accumulate over time.
+
+To figure out where the leak is coming from, I would look into the specific files mentioned: `qdev.c`, `object.c`, and others. Perhaps there's a place where memory is allocated but not properly freed when device addition fails or completes.
+
+I should consider common causes of memory leaks in such contexts. Maybe during device setup, some structures aren't being cleaned up correctly if an error occurs. Or perhaps there's a missing free operation after allocating memory for properties or device data.
+
+Since the user included file paths pointing to their build directory, it might be specific to how they've compiled QEMU. But generally, this issue would exist in the source code regardless of the build setup.
+
+I think the next step is to use AddressSanitizer effectively to identify the exact lines where memory is being allocated but not freed. By running QEMU under ASAN and seeing which parts trigger the leak, I can pinpoint the problematic areas.
+
+In summary, the user needs to identify where in their code these allocations are happening and ensure that all paths leading to those allocations also have corresponding frees. This might involve checking error cases or ensuring that resources are released even if an operation is aborted.
+</think>
+
+The stack trace and memory leak information you provided indicate a memory leak in QEMU, specifically when adding devices. Here's a breakdown of what the problem likely is and how to approach fixing it:
+
+### 1. **Understanding the Leak:**
+   - The AddressSanitizer reports that 20 bytes were leaked from two separate allocations.
+   - This suggests that memory allocated during device addition or configuration isn't being properly freed.
+
+### 2. **Stack Trace Analysis:**
+   - The stack trace shows the call chain leading to the leak:
+     ```
+     #0 0x55c1adcd638b in malloc (/lib/x86_64-linux-gnu/libasan.so.5+0x19a38b)
+     ...
+     #12 0x55c1ad27021a in qdev_device_add_from_qdict
+     #13 0x55c1ad271364 in qdev_device_add
+     #14 0x55c1ad2726eb in qmp_device_add
+     #15 0x55c1ad27311d in hmp_device_add
+     ...
+     ```
+   - The leak occurs when adding a device, likely during the `qdev_device_add_from_qdict` function.
+
+### 3. **Possible Causes:**
+   - A structure or resource allocated during device addition isn't being properly freed.
+   - There might be an error in handling the device's properties or configuration.
+
+### 4. **Steps to Fix:**
+   - **Enable ASAN and Reproduce:** Run QEMU with AddressSanitizer enabled and reproduce the leak to get more details about where the memory is allocated but not freed.
+   - **Check Memory Allocations:** Look into the `qdev_device_add_from_qdict` function and related functions to ensure all allocations are properly handled, especially in error cases or during cleanup.
+   - **Review Device Addition Code:** Focus on the device addition flow (e.g., `hmp_device_add`, `qdev_device_add`) to identify where memory might be leaked.
+
+### 5. **Example Fix:**
+   If you find that a specific structure isn't being freed, ensure it's properly released. For example:
+   ```c
+   Device *new_dev = malloc(sizeof(Device)); // Allocate memory
+   ... // Use new_dev
+   free(new_dev); // Ensure this line is reached in all code paths
+   ```
+
+### 6. **Additional Tips:**
+   - Use debugging tools like `valgrind` or QEMU's internal leak detection to identify the exact location of the leak.
+   - Check if there are any missing error checks or cleanup steps after device addition.
+
+By following these steps, you should be able to pinpoint and fix the memory leak in your QEMU setup.
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