Using AI to Analyze an ACE Abend Stack Dump

A case was opened where it was noted that ACE 13.0.x would not start when integrating with a Remote Queue manager 9.4.

An abend was generated indicating a segmentation fault at the Integration Server level with the following Stack Dump for the failing thread:

This stack was placed in AI asking “why was this abend generated”.  The response received was the following:

The abend (abnormal end) you're seeing is due to a **segmentation fault**, which typically indicates that the program tried to access memory it shouldn't have. Here's a breakdown of what the stack trace and error message suggest:

---

### 🔍 **Root Cause Summary**

- **Signal received**: Segmentation fault (`SIGSEGV`)

- **Thread**: 52

- **Library involved**: `libcurl.so.4`, `libmqe_r.so`, and `libmqconnector.so`

- **Function where it crashed**: `curl_multi_add_handle` → `curl_easy_perform` → MQ-related libraries

---

### 🧠 **Likely Cause**

The crash occurred during a call to `curl_easy_perform`, which is part of the **libcurl** library used for HTTP communication. This was invoked from within **IBM MQ libraries** (`libmqe_r.so`) and **IBM App Connect Enterprise (ACE)** components (`libmqconnector.so`).

This suggests:

- A **network call** (possibly to a REST API or MQ endpoint) was made using `libcurl`.

- During this operation, **invalid memory access** occurred—possibly due to:

  - A **null or invalid pointer** passed to `curl_easy_perform`

  - A **misconfigured or corrupted MQ connection**

  - A **threading issue** or race condition

  - A **library version mismatch** (e.g., incompatible libcurl or MQ libraries)

---

### 🛠️ **What You Can Do**

1. **Check for core dumps**: If core dumps are enabled, analyze the core file with `gdb`:

   ```bash

   gdb /path/to/IntegrationServer core

   ```

   Then use `bt` (backtrace) to inspect the call stack.

2. **Verify libcurl and MQ versions**:

   - Ensure the versions of `libcurl` and `libmqe_r.so` are compatible with ACE 13.

   - Check for any known issues or patches from IBM.

3. **Review MQ connection setup**:

   - Look at the MQ connection parameters (e.g., channel, queue manager, credentials).

   - Ensure the endpoint is reachable and not returning malformed responses.

4. **Enable ACE debug logs**:

   - Increase the logging level to capture more context around the crash.

   - Look for errors or warnings just before the crash.

5. **Check for threading issues**:

   - If you're using shared connectors or multi-threaded flows, ensure thread safety.

---

Would you like help analyzing a core dump, checking for known issues in IBM support, or reviewing your MQ connection configuration?

AI was then asked to check for known issues in IBM Support and noted:

I couldn't find any specific IBM support articles directly addressing segmentation faults in IBM App Connect Enterprise (ACE) 13 involving `libcurl` and `libmqe_r.so`. However, here are a few steps you can take to investigate further:

### 🔎 Where to Look Next

1. **IBM Support Portal**:

   - Visit IBM Support and search for:

     ```

     ACE 13 segmentation fault libcurl libmqe_r.so

     ```

   - You can filter by product (IBM App Connect Enterprise) and version (13.x).

2. **IBM Fix Central**:

   - Check for any **fix packs or interim fixes** for ACE 13 that mention segmentation faults or MQ/libcurl issues:

     IBM Fix Central

3. **IBM Community Forums**:

   - The IBM Middleware Community often has discussions and solutions for similar issues.

4. **Open a PMR (Problem Management Record)**:

   - If this is a production-impacting issue and you have a support contract, opening a case with IBM is the fastest way to get tailored help.

---

Would you like help drafting a support case description or narrowing down the issue further based on your environment or flow configuration?

The first advice was taken and IBM Support was searched for:
     ACE 13 segmentation fault libcurl libmqe_r.so

This did reference an existing known issue and the proper steps were taken to obtain the fix for the issue.

Summary:

AI can be a beneficial tool for analyzing an abend stack dump.  It could be useful for customers for self guidance, and when opening cases with support. 

AI can direct the customer for what documentation may need to be collected and a better, more-detailed case description.