Aarch64 reverse debugging test is unreliable
Description of problem:
The reverse-debugging test for the aarch64 target is not working reliably, especially if the host system is under load, approx. 1 or 2 out of 10 test runs fail. The log looks like this:

```
2025-04-14 10:24:35,042 test             L0310 INFO | INIT 1-ReverseDebugging_AArch64.test_aarch64_virt
2025-04-14 10:24:35,043 parameters       L0142 DEBUG| PARAMS (key=timeout, path=*, default=10) => 10
2025-04-14 10:24:35,043 test             L0338 DEBUG| Test metadata:
2025-04-14 10:24:35,043 test             L0340 DEBUG|   filename: /.../tmp/qemu-build/tests/avocado/reverse_debugging.py
2025-04-14 10:24:35,044 test             L0346 DEBUG|   teststmpdir: /var/tmp/avocado_w5d2bkam
2025-04-14 10:24:35,044 test             L0536 INFO | START 1-ReverseDebugging_AArch64.test_aarch64_virt
2025-04-14 10:24:35,044 test             L0207 DEBUG| DATA (filename=output.expected) => NOT FOUND (data sources: variant, test, file)
2025-04-14 10:24:35,045 parameters       L0142 DEBUG| PARAMS (key=arch, path=*, default=aarch64) => 'aarch64'
2025-04-14 10:24:35,045 parameters       L0142 DEBUG| PARAMS (key=cpu, path=*, default=cortex-a53) => 'cortex-a53'
2025-04-14 10:24:35,046 parameters       L0142 DEBUG| PARAMS (key=qemu_bin, path=*, default=./qemu-system-aarch64) => './qemu-system-aarch64'
2025-04-14 10:24:35,272 parameters       L0142 DEBUG| PARAMS (key=machine, path=*, default=virt) => 'virt'
2025-04-14 10:24:35,290 test             L0465 DEBUG| Test workdir initialized at: /var/tmp/.avocado-taskky_yb2qf/test-results/tmp_dir56wqq7g0/1-ReverseDebugging_AArch64.test_aarch64_virt
2025-04-14 10:24:35,290 process          L0658 INFO | Running '/.../tmp/qemu-build/qemu-img create -f qcow2 /var/tmp/.avocado-taskky_yb2qf/test-results/tmp_dir56wqq7g0/1-ReverseDebugging_AArch64.test_aarch64_virt/disk.qcow2 128M'
2025-04-14 10:24:35,347 process          L0470 DEBUG| [stdout] Formatting '/var/tmp/.avocado-taskky_yb2qf/test-results/tmp_dir56wqq7g0/1-ReverseDebugging_AArch64.test_aarch64_virt/disk.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=134217728 lazy_refcounts=off refcount_bits=16
2025-04-14 10:24:35,393 process          L0739 INFO | Command '/.../tmp/qemu-build/qemu-img create -f qcow2 /var/tmp/.avocado-taskky_yb2qf/test-results/tmp_dir56wqq7g0/1-ReverseDebugging_AArch64.test_aarch64_virt/disk.qcow2 128M' finished with 0 after 0.100170269s
2025-04-14 10:24:35,475 __init__         L0314 DEBUG| QEMUMachine "28fc0d7d-bd0a-44c0-afa8-f24a1800132f" created
2025-04-14 10:24:35,475 __init__         L0315 DEBUG| QEMUMachine "28fc0d7d-bd0a-44c0-afa8-f24a1800132f" temp_dir: /var/tmp/.avocado-taskky_yb2qf/test-results/tmp_dir56wqq7g0/1-ReverseDebugging_AArch64.test_aarch64_virt/qemu-machine-052_8e_k
2025-04-14 10:24:35,475 __init__         L0316 DEBUG| QEMUMachine "28fc0d7d-bd0a-44c0-afa8-f24a1800132f" log_dir: /var/tmp/.avocado-taskky_yb2qf/test-results/1-ReverseDebugging_AArch64.test_aarch64_virt
2025-04-14 10:24:36,195 __init__         L0314 DEBUG| QEMUMachine "3f348d83-7aa3-4381-9919-389bc85ed85b" created
2025-04-14 10:24:36,196 __init__         L0315 DEBUG| QEMUMachine "3f348d83-7aa3-4381-9919-389bc85ed85b" temp_dir: /var/tmp/.avocado-taskky_yb2qf/test-results/tmp_dir56wqq7g0/1-ReverseDebugging_AArch64.test_aarch64_virt/qemu-machine-vxlortdq
2025-04-14 10:24:36,196 __init__         L0316 DEBUG| QEMUMachine "3f348d83-7aa3-4381-9919-389bc85ed85b" log_dir: /var/tmp/.avocado-taskky_yb2qf/test-results/1-ReverseDebugging_AArch64.test_aarch64_virt
2025-04-14 10:24:37,623 stacktrace       L0039 ERROR| 
2025-04-14 10:24:37,628 stacktrace       L0041 ERROR| Reproduced traceback from: /usr/lib/python3.13/site-packages/avocado/core/test.py:793
2025-04-14 10:24:37,643 stacktrace       L0045 ERROR| Traceback (most recent call last):
2025-04-14 10:24:37,643 stacktrace       L0045 ERROR|   File "/usr/lib/python3.13/site-packages/avocado/core/decorators.py", line 90, in wrapper
2025-04-14 10:24:37,643 stacktrace       L0045 ERROR|     return function(obj, *args, **kwargs)
2025-04-14 10:24:37,643 stacktrace       L0045 ERROR|   File "/.../tmp/qemu-build/tests/avocado/reverse_debugging.py", line 239, in test_aarch64_virt
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|     self.reverse_debugging(
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|     ~~~~~~~~~~~~~~~~~~~~~~^
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|         args=('-kernel', kernel_path))
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|   File "/.../tmp/qemu-build/tests/avocado/reverse_debugging.py", line 179, in reverse_debugging
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|     if self.vm_get_icount(vm) == last_icount - 1:
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|        ~~~~~~~~~~~~~~~~~~^^^^
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|   File "/.../tmp/qemu-build/tests/avocado/reverse_debugging.py", line 100, in vm_get_icount
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|     return vm.qmp('query-replay')['return']['icount']
2025-04-14 10:24:37,644 stacktrace       L0045 ERROR|            ~~~~~~^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/machine/machine.py", line 711, in qmp
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|     ret = self._qmp.cmd_raw(cmd, args=qmp_args)
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 208, in cmd_raw
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|     return self.cmd_obj(qmp_cmd)
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|            ~~~~~~~~~~~~^^^^^^^^^
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 186, in cmd_obj
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|     self._sync(
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|     ~~~~~~~~~~^
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|         # pylint: disable=protected-access
2025-04-14 10:24:37,645 stacktrace       L0045 ERROR|         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,646 stacktrace       L0045 ERROR|     ...<5 lines>...
2025-04-14 10:24:37,646 stacktrace       L0045 ERROR|         self._timeout
2025-04-14 10:24:37,646 stacktrace       L0045 ERROR|         ^^^^^^^^^^^^^
2025-04-14 10:24:37,646 stacktrace       L0045 ERROR|     )
2025-04-14 10:24:37,646 stacktrace       L0045 ERROR|     ^
2025-04-14 10:24:37,646 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 102, in _sync
2025-04-14 10:24:37,646 stacktrace       L0045 ERROR|     return self._aloop.run_until_complete(
2025-04-14 10:24:37,647 stacktrace       L0045 ERROR|            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
2025-04-14 10:24:37,647 stacktrace       L0045 ERROR|         asyncio.wait_for(future, timeout=timeout)
2025-04-14 10:24:37,647 stacktrace       L0045 ERROR|         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,647 stacktrace       L0045 ERROR|     )
2025-04-14 10:24:37,647 stacktrace       L0045 ERROR|     ^
2025-04-14 10:24:37,647 stacktrace       L0045 ERROR|   File "/usr/lib64/python3.13/asyncio/base_events.py", line 725, in run_until_complete
2025-04-14 10:24:37,647 stacktrace       L0045 ERROR|     return future.result()
2025-04-14 10:24:37,647 stacktrace       L0045 ERROR|            ~~~~~~~~~~~~~^^
2025-04-14 10:24:37,647 stacktrace       L0045 ERROR|   File "/usr/lib64/python3.13/asyncio/tasks.py", line 507, in wait_for
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|     return await fut
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|            ^^^^^^^^^
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 547, in _raw
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|     return await self._execute(msg, assign_id=assign_id)
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 496, in _execute
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|     return await self._reply(exec_id)
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|            ^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 463, in _reply
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR|     raise result
2025-04-14 10:24:37,648 stacktrace       L0045 ERROR| qemu.qmp.qmp_client.ExecInterruptedError: Disconnected
2025-04-14 10:24:37,649 stacktrace       L0046 ERROR| 
2025-04-14 10:24:37,649 test             L0798 DEBUG| Local variables:
2025-04-14 10:24:37,671 test             L0801 DEBUG|  -> obj <class 'reverse_debugging.ReverseDebugging_AArch64'>: 1-ReverseDebugging_AArch64.test_aarch64_virt
2025-04-14 10:24:37,671 test             L0801 DEBUG|  -> args <class 'tuple'>: ()
2025-04-14 10:24:37,671 test             L0801 DEBUG|  -> kwargs <class 'dict'>: {}
2025-04-14 10:24:37,671 test             L0801 DEBUG|  -> condition <class 'str'>: 1
2025-04-14 10:24:37,671 test             L0801 DEBUG|  -> function <class 'function'>: <function ReverseDebugging_AArch64.test_aarch64_virt at 0x7fc6d4cc87c0>
2025-04-14 10:24:37,672 test             L0801 DEBUG|  -> message <class 'str'>: Test is unstable on GitLab
2025-04-14 10:24:37,672 test             L0801 DEBUG|  -> negate <class 'bool'>: True
2025-04-14 10:24:37,673 stacktrace       L0039 ERROR| 
2025-04-14 10:24:37,673 stacktrace       L0041 ERROR| Reproduced traceback from: /usr/lib/python3.13/site-packages/avocado/core/test.py:819
2025-04-14 10:24:37,678 stacktrace       L0045 ERROR| Traceback (most recent call last):
2025-04-14 10:24:37,679 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/machine/machine.py", line 580, in _soft_shutdown
2025-04-14 10:24:37,679 stacktrace       L0045 ERROR|     self.qmp('quit')
2025-04-14 10:24:37,679 stacktrace       L0045 ERROR|     ~~~~~~~~^^^^^^^^
2025-04-14 10:24:37,679 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/machine/machine.py", line 711, in qmp
2025-04-14 10:24:37,679 stacktrace       L0045 ERROR|     ret = self._qmp.cmd_raw(cmd, args=qmp_args)
2025-04-14 10:24:37,679 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 208, in cmd_raw
2025-04-14 10:24:37,679 stacktrace       L0045 ERROR|     return self.cmd_obj(qmp_cmd)
2025-04-14 10:24:37,679 stacktrace       L0045 ERROR|            ~~~~~~~~~~~~^^^^^^^^^
2025-04-14 10:24:37,679 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 192, in cmd_obj
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR|     self._qmp._raw(qmp_cmd, assign_id=False),
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR|     ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 155, in _wrapper
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR|     raise StateError(emsg, proto.runstate, required_state)
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR| qemu.qmp.protocol.StateError: QMPClient is disconnecting. Call disconnect() to return to IDLE state.
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR| 
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR| During handling of the above exception, another exception occurred:
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR| 
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR| Traceback (most recent call last):
2025-04-14 10:24:37,680 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/machine/machine.py", line 611, in _do_shutdown
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|     self._soft_shutdown(timeout)
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|     ~~~~~~~~~~~~~~~~~~~^^^^^^^^^
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/machine/machine.py", line 583, in _soft_shutdown
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|     self._close_qmp_connection()
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|     ~~~~~~~~~~~~~~~~~~~~~~~~~~^^
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/machine/machine.py", line 501, in _close_qmp_connection
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|     self._qmp.close()
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|     ~~~~~~~~~~~~~~~^^
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 281, in close
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|     self._sync(
2025-04-14 10:24:37,681 stacktrace       L0045 ERROR|     ~~~~~~~~~~^
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|         self._qmp.disconnect()
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|         ^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|     )
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|     ^
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 102, in _sync
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|     return self._aloop.run_until_complete(
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|         asyncio.wait_for(future, timeout=timeout)
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|     )
2025-04-14 10:24:37,682 stacktrace       L0045 ERROR|     ^
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|   File "/usr/lib64/python3.13/asyncio/base_events.py", line 725, in run_until_complete
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|     return future.result()
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|            ~~~~~~~~~~~~~^^
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|   File "/usr/lib64/python3.13/asyncio/tasks.py", line 507, in wait_for
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|     return await fut
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|            ^^^^^^^^^
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 399, in disconnect
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|     await self._wait_disconnect()
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 719, in _wait_disconnect
2025-04-14 10:24:37,683 stacktrace       L0045 ERROR|     await all_defined_tasks  # Raise Exceptions from the bottom half.
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|     ^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 870, in _bh_loop_forever
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|     await async_fn()
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 908, in _bh_recv_message
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|     msg = await self._recv()
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|           ^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 1009, in _recv
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|     message = await self._do_recv()
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|               ^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 402, in _do_recv
2025-04-14 10:24:37,684 stacktrace       L0045 ERROR|     msg_bytes = await self._readline()
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR|                 ^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 977, in _readline
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR|     raise EOFError
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR| EOFError
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR| 
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR| The above exception was the direct cause of the following exception:
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR| 
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR| Traceback (most recent call last):
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR|   File "/.../tmp/qemu-build/tests/avocado/avocado_qemu/__init__.py", line 372, in tearDown
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR|     vm.shutdown()
2025-04-14 10:24:37,685 stacktrace       L0045 ERROR|     ~~~~~~~~~~~^^
2025-04-14 10:24:37,686 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/machine/machine.py", line 648, in shutdown
2025-04-14 10:24:37,686 stacktrace       L0045 ERROR|     self._do_shutdown(timeout)
2025-04-14 10:24:37,686 stacktrace       L0045 ERROR|     ~~~~~~~~~~~~~~~~~^^^^^^^^^
2025-04-14 10:24:37,686 stacktrace       L0045 ERROR|   File "/.../devel/qemu/python/qemu/machine/machine.py", line 618, in _do_shutdown
2025-04-14 10:24:37,686 stacktrace       L0045 ERROR|     raise AbnormalShutdown("Could not perform graceful shutdown") \
2025-04-14 10:24:37,686 stacktrace       L0045 ERROR|         from exc
2025-04-14 10:24:37,686 stacktrace       L0045 ERROR| qemu.machine.machine.AbnormalShutdown: Could not perform graceful shutdown
2025-04-14 10:24:37,686 stacktrace       L0046 ERROR| 
2025-04-14 10:24:37,694 test             L0941 ERROR| Traceback (most recent call last):
2025-04-14 10:24:37,694 test             L0941 ERROR|   File "/usr/lib/python3.13/site-packages/avocado/core/test.py", line 881, in _run_avocado
    raise test_exception
2025-04-14 10:24:37,694 test             L0941 ERROR|   File "/usr/lib/python3.13/site-packages/avocado/core/test.py", line 788, in _run_avocado
    testMethod()
    ~~~~~~~~~~^^
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/usr/lib/python3.13/site-packages/avocado/core/decorators.py", line 90, in wrapper
    return function(obj, *args, **kwargs)
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/.../tmp/qemu-build/tests/avocado/reverse_debugging.py", line 239, in test_aarch64_virt
    self.reverse_debugging(
    ~~~~~~~~~~~~~~~~~~~~~~^
        args=('-kernel', kernel_path))
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/.../tmp/qemu-build/tests/avocado/reverse_debugging.py", line 179, in reverse_debugging
    if self.vm_get_icount(vm) == last_icount - 1:
       ~~~~~~~~~~~~~~~~~~^^^^
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/.../tmp/qemu-build/tests/avocado/reverse_debugging.py", line 100, in vm_get_icount
    return vm.qmp('query-replay')['return']['icount']
           ~~~~~~^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/.../devel/qemu/python/qemu/machine/machine.py", line 711, in qmp
    ret = self._qmp.cmd_raw(cmd, args=qmp_args)
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 208, in cmd_raw
    return self.cmd_obj(qmp_cmd)
           ~~~~~~~~~~~~^^^^^^^^^
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 186, in cmd_obj
    self._sync(
    ~~~~~~~~~~^
        # pylint: disable=protected-access
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
        self._timeout
        ^^^^^^^^^^^^^
    )
    ^
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 102, in _sync
    return self._aloop.run_until_complete(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        asyncio.wait_for(future, timeout=timeout)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/usr/lib64/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
2025-04-14 10:24:37,695 test             L0941 ERROR|   File "/usr/lib64/python3.13/asyncio/tasks.py", line 507, in wait_for
    return await fut
           ^^^^^^^^^
2025-04-14 10:24:37,696 test             L0941 ERROR|   File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 547, in _raw
    return await self._execute(msg, assign_id=assign_id)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,696 test             L0941 ERROR|   File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 496, in _execute
    return await self._reply(exec_id)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
2025-04-14 10:24:37,696 test             L0941 ERROR|   File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 463, in _reply
    raise result
2025-04-14 10:24:37,696 test             L0941 ERROR| qemu.qmp.qmp_client.ExecInterruptedError: Disconnected
2025-04-14 10:24:37,696 test             L0956 ERROR| ERROR 1-ReverseDebugging_AArch64.test_aarch64_virt -> ExecInterruptedError: Disconnected
2025-04-14 10:24:37,696 test             L0948 INFO | 
```
Steps to reproduce:
1. ``make check-venv``
2. Run something in the background that keeps all CPUs busy
3. ``for ((x=0;x<20;x++)); do QEMU_TEST_FLAKY_TESTS=1 pyvenv/bin/avocado run tests/avocado/reverse_debugging.py:ReverseDebugging_AArch64.test_aarch64_virt  ; done``
Additional information:
The problem can be reproduced with the test converted to the functional framework, too (that's where I noticed it first). In that case the stack trace looked like this:

```
$ QEMU_TEST_ALLOW_SLOW=1 QEMU_TEST_ALLOW_UNTRUSTED_CODE=1 QEMU_TEST_FLAKY_TESTS=1 QEMU_TEST_ALLOW_LARGE_STORAGE=1 ~/devel/qemu/tests/functional/test_aarch64_reverse_debug.py 
TAP version 13
Traceback (most recent call last):
  File "/.../devel/qemu/tests/functional/test_aarch64_reverse_debug.py", line 33, in test_aarch64_virt
    self.reverse_debugging(args=('-kernel', kernel_path))
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/.../devel/qemu/tests/functional/reverse_debugging.py", line 147, in reverse_debugging
    pc = self.get_pc(g)
  File "/.../devel/qemu/tests/functional/reverse_debugging.py", line 82, in get_pc
    return self.get_reg(g, self.REG_PC)
           ~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/.../devel/qemu/tests/functional/reverse_debugging.py", line 77, in get_reg
    return self.get_reg_le(g, reg)
           ~~~~~~~~~~~~~~~^^^^^^^^
  File "/.../devel/qemu/tests/functional/reverse_debugging.py", line 63, in get_reg_le
    res = g.cmd(b'p%x' % reg)
  File "/usr/lib/python3.13/site-packages/avocado/utils/gdb.py", line 783, in cmd
    response_payload = self.decode(result)
  File "/usr/lib/python3.13/site-packages/avocado/utils/gdb.py", line 738, in decode
    raise InvalidPacketError
avocado.utils.gdb.InvalidPacketError

not ok 1 test_aarch64_reverse_debug.ReverseDebugging_AArch64.test_aarch64_virt
Traceback (most recent call last):
  File "/.../devel/qemu/python/qemu/machine/machine.py", line 580, in _soft_shutdown
    self.qmp('quit')
    ~~~~~~~~^^^^^^^^
  File "/.../devel/qemu/python/qemu/machine/machine.py", line 711, in qmp
    ret = self._qmp.cmd_raw(cmd, args=qmp_args)
  File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 208, in cmd_raw
    return self.cmd_obj(qmp_cmd)
           ~~~~~~~~~~~~^^^^^^^^^
  File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 186, in cmd_obj
    self._sync(
    ~~~~~~~~~~^
        # pylint: disable=protected-access
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<5 lines>...
        self._timeout
        ^^^^^^^^^^^^^
    )
    ^
  File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 102, in _sync
    return self._aloop.run_until_complete(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        asyncio.wait_for(future, timeout=timeout)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib64/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/usr/lib64/python3.13/asyncio/tasks.py", line 507, in wait_for
    return await fut
           ^^^^^^^^^
  File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 547, in _raw
    return await self._execute(msg, assign_id=assign_id)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 496, in _execute
    return await self._reply(exec_id)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/.../devel/qemu/python/qemu/qmp/qmp_client.py", line 463, in _reply
    raise result
qemu.qmp.qmp_client.ExecInterruptedError: Disconnected

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/.../devel/qemu/python/qemu/machine/machine.py", line 611, in _do_shutdown
    self._soft_shutdown(timeout)
    ~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/.../devel/qemu/python/qemu/machine/machine.py", line 583, in _soft_shutdown
    self._close_qmp_connection()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/.../devel/qemu/python/qemu/machine/machine.py", line 501, in _close_qmp_connection
    self._qmp.close()
    ~~~~~~~~~~~~~~~^^
  File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 281, in close
    self._sync(
    ~~~~~~~~~~^
        self._qmp.disconnect()
        ^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/.../devel/qemu/python/qemu/qmp/legacy.py", line 102, in _sync
    return self._aloop.run_until_complete(
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
        asyncio.wait_for(future, timeout=timeout)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib64/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/usr/lib64/python3.13/asyncio/tasks.py", line 507, in wait_for
    return await fut
           ^^^^^^^^^
  File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 399, in disconnect
    await self._wait_disconnect()
  File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 719, in _wait_disconnect
    await all_defined_tasks  # Raise Exceptions from the bottom half.
    ^^^^^^^^^^^^^^^^^^^^^^^
  File "/.../devel/qemu/python/qemu/qmp/protocol.py", line 834, in _bh_close_stream
    await wait_closed(self._writer)
  File "/.../devel/qemu/python/qemu/qmp/util.py", line 130, in wait_closed
    await writer.wait_closed()
  File "/usr/lib64/python3.13/asyncio/streams.py", line 358, in wait_closed
    await self._protocol._get_close_waiter(self)
  File "/usr/lib64/python3.13/asyncio/selector_events.py", line 1067, in write
    n = self._sock.send(data)
BrokenPipeError: [Errno 32] Broken pipe

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/.../devel/qemu/tests/functional/qemu_test/testcase.py", line 398, in tearDown
    vm.shutdown()
    ~~~~~~~~~~~^^
  File "/.../devel/qemu/python/qemu/machine/machine.py", line 648, in shutdown
    self._do_shutdown(timeout)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/.../devel/qemu/python/qemu/machine/machine.py", line 618, in _do_shutdown
    raise AbnormalShutdown("Could not perform graceful shutdown") \
        from exc
qemu.machine.machine.AbnormalShutdown: Could not perform graceful shutdown

not ok 1 test_aarch64_reverse_debug.ReverseDebugging_AArch64.test_aarch64_virt
1..1
```