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+<think>
+Okay, so I'm trying to figure out why my AIX system isn't working properly when I use QEMU versions newer than 2.11.2. From what I understand, it was running fine before with QEMU 2.11.2, but now any version after that causes an error during boot.
+
+The error message says something about the qemu_tcg_cpu_thread_fn function failing an assertion: "cpu->halted". That's a bit confusing. I know that QEMU uses TCG (Translation and Compilation) for emulation, especially on systems where KVM isn't available or isn't suitable. So maybe there's a regression in how TCG is handled in newer QEMU versions.
+
+I should probably look into what changed between QEMU 2.11.2 and the version I'm using now. Maybe some changes in how the CPU emulation works, particularly for PowerPC architectures since AIX runs on PowerPC systems.
+
+Looking at the provided logs from when it was working, everything seemed to initialize correctly: Kernel tables were updated, daemons started without issues, and the system entered operational mode. The error only occurs after updating QEMU beyond 2.11.2.
+
+I also see that when I log in via SSH, the system shows "modelname IBM pSeries (emulated by qemu)", which suggests that QEMU is correctly emulating a PowerPC machine. The CPU attributes show it's using a POWER9 processor with some specific settings like SMT being disabled and a frequency of 1000000000.
+
+So, the problem is likely in how newer versions of QEMU handle the TCG for PowerPC systems. Maybe there was an update that changed how the CPU thread function works or how it interacts with the halted state of the processor.
+
+I should check if there are known issues related to this error message in QEMU's issue tracker. Since the user mentioned moving the bug report to GitLab, I'll need to look at the linked issue (https://gitlab.com/qemu-project/qemu/-/issues/269) for more details or see if others have encountered similar problems.
+
+Perhaps I can try downgrading QEMU back to 2.11.2 to confirm that it works again. If it does, then the problem is definitely with a change in newer versions. Alternatively, maybe there's a patch or configuration fix available that addresses this specific assertion failure.
+
+I also wonder if any changes were made to how the CPU initialization happens in QEMU after 2.11.2. Maybe the way the halted state is handled differs, causing the assertion to fail when it shouldn't.
+
+Another thought: Could there be a change in how AIX interacts with the emulated hardware via QEMU? Perhaps AIX relies on certain TCG behaviors that were present in older versions but changed in newer ones.
+
+I should also consider if any kernel parameters or configurations need to be adjusted to make the newer QEMU versions work with AIX. Maybe there are new flags or options I can pass to QEMU that would resolve this issue without needing to downgrade.
+
+Additionally, checking the QEMU release notes for versions after 2.11.2 might shed light on any changes related to TCG, CPU emulation, or PowerPC support that could be causing this problem.
+
+If downgrading isn't an option, I might need to look into compiling a newer version of QEMU with some specific patches applied to fix the issue. Alternatively, if it's a bug in QEMU, contributing to or waiting for a fix from the project would be necessary.
+
+In summary, the key points are:
+1. The error occurs in QEMU versions > 2.11.2.
+2. The error message relates to TCG CPU thread function and halted state.
+3. Need to check for known issues in QEMU's GitLab tracker or release notes.
+4. Potential solutions include downgrading, applying patches, or adjusting configurations.
+
+I'll start by visiting the linked GitLab issue to see if there are any discussions or solutions provided there. If not, I might need to experiment with different QEMU versions or seek help from the QEMU community forums or mailing lists for more specific guidance.
+</think>
+
+The issue arises when using QEMU versions newer than 2.11.2 to run AIX, encountering an assertion failure in TCG CPU emulation. The problem is likely due to changes in how QEMU handles TCG for PowerPC systems post-2.11.2.
+
+**Step-by-Step Explanation:**
+
+1. **Identify the Error:** The error occurs during boot with QEMU versions > 2.11.2, pointing to a failure in `qemu_tcg_cpu_thread_fn` where `cpu->halted` is not as expected.
+
+2. **Check QEMU Version Changes:** Compare changes between QEMU 2.11.2 and the newer version, focusing on TCG and PowerPC CPU emulation updates that might affect AIX.
+
+3. **Consult Known Issues:** Visit QEMU's GitLab issue tracker (linked) to see if others have encountered this error and for potential fixes or workarounds.
+
+4. **Test with Older Version:** Revert to QEMU 2.11.2 to confirm functionality. If successful, the problem lies in newer versions' changes.
+
+5. **Apply Patches or Adjust Configurations:** Look for available patches or configuration options that can resolve the issue without downgrading.
+
+6. **Engage with Community:** Seek assistance from QEMU community resources if the issue persists and requires further investigation.
+
+**Solution:**
+
+For immediate resolution, downgrade QEMU to version 2.11.2, as it is confirmed to work with AIX. If an upgrade is necessary, monitor QEMU's release notes or issue tracker for updates addressing this bug. Consider compiling a patched version if a fix becomes available.
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