prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  The smt combiner is raising IndexError exceptions in production.
  The CpuTopology combiner is throwing a large number of the exception IndexError('list index out of range',) in production.
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `insights/combiners/smt.py`
  Content:
  ```
  1 """
  2 Simultaneous Multithreading (SMT) combiner
  3 ==========================================
  4 
  5 Combiner for Simultaneous Multithreading (SMT). It uses the results of the following parsers:
  6 :class:`insights.parsers.smt.CpuCoreOnline`,
  7 :class:`insights.parsers.smt.CpuSiblings`.
  8 """
  9 
  10 from insights.core.plugins import combiner
  11 from insights.parsers.smt import CpuCoreOnline, CpuSiblings
  12 
  13 
  14 @combiner(CpuCoreOnline, CpuSiblings)
  15 class CpuTopology(object):
  16     """
  17     Class for collecting the online/siblings status for all CPU cores.
  18 
  19     Sample output of the ``CpuCoreOnline`` parser is::
  20 
  21         [[Core 0: Online], [Core 1: Online], [Core 2: Online], [Core 3: Online]]
  22 
  23     Sample output of the ``CpuSiblings`` parser is::
  24 
  25         [[Core 0 Siblings: [0, 2]], [Core 1 Siblings: [1, 3]], [Core 2 Siblings: [0, 2]], [Core 3 Siblings: [1, 3]]]
  26 
  27     Attributes:
  28         cores (list of dictionaries): List of all cores.
  29         all_solitary (bool): True, if hyperthreading is not used.
  30 
  31     Examples:
  32         >>> type(cpu_topology)
  33         <class 'insights.combiners.smt.CpuTopology'>
  34         >>> cpu_topology.cores == [{'online': True, 'siblings': [0, 2]}, {'online': True, 'siblings': [1, 3]}, {'online': True, 'siblings': [0, 2]}, {'online': True, 'siblings': [1, 3]}]
  35         True
  36         >>> cpu_topology.all_solitary
  37         False
  38     """
  39 
  40     def __init__(self, cpu_online, cpu_siblings):
  41         self.cores = []
  42 
  43         max_cpu_core_id = max([core.core_id for core in cpu_online])
  44         for n in range(max_cpu_core_id + 1):
  45             online = [core for core in cpu_online if core.core_id == n]
  46             online = online[0].on
  47             siblings = [sibling for sibling in cpu_siblings if sibling.core_id == n]
  48             if len(siblings) != 0:
  49                 siblings = siblings[0].siblings
  50 
  51             one_core = {"online": online, "siblings": siblings}
  52             self.cores.append(one_core)
  53 
  54         self.all_solitary = all([len(core["siblings"]) <= 1 for core in self.cores])
  55 
  56     def online(self, core_id):
  57         """
  58         Returns bool value obtained from "online" file for given core_id.
  59         """
  60         if core_id >= len(self.cores) or core_id < 0:
  61             return None
  62         return self.cores[core_id]["online"]
  63 
  64     def siblings(self, core_id):
  65         """
  66         Returns list of siblings for given core_id.
  67         """
  68         if core_id >= len(self.cores) or core_id < 0:
  69             return None
  70         return self.cores[core_id]["siblings"]
  71
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/insights/combiners/smt.py b/insights/combiners/smt.py
  --- a/insights/combiners/smt.py
  +++ b/insights/combiners/smt.py
  @@ -43,7 +43,13 @@
           max_cpu_core_id = max([core.core_id for core in cpu_online])
           for n in range(max_cpu_core_id + 1):
               online = [core for core in cpu_online if core.core_id == n]
  -            online = online[0].on
  +            # On some boxes cpu0 doesn't have the online file, since technically cpu0 will always
  +            # be online. So check if online returns anything before trying to access online[0].
  +            # If it returns nothing and n is 0 set online to True.
  +            if online:
  +                online = online[0].on
  +            elif not online and n == 0:
  +                online = True
               siblings = [sibling for sibling in cpu_siblings if sibling.core_id == n]
               if len(siblings) != 0:
                   siblings = siblings[0].siblings
  
verification_info: {"golden_diff": "diff --git a/insights/combiners/smt.py b/insights/combiners/smt.py\n--- a/insights/combiners/smt.py\n+++ b/insights/combiners/smt.py\n@@ -43,7 +43,13 @@\n         max_cpu_core_id = max([core.core_id for core in cpu_online])\n         for n in range(max_cpu_core_id + 1):\n             online = [core for core in cpu_online if core.core_id == n]\n-            online = online[0].on\n+            # On some boxes cpu0 doesn't have the online file, since technically cpu0 will always\n+            # be online. So check if online returns anything before trying to access online[0].\n+            # If it returns nothing and n is 0 set online to True.\n+            if online:\n+                online = online[0].on\n+            elif not online and n == 0:\n+                online = True\n             siblings = [sibling for sibling in cpu_siblings if sibling.core_id == n]\n             if len(siblings) != 0:\n                 siblings = siblings[0].siblings\n", "issue": "The smt combiner is raising IndexError exceptions in production.\nThe CpuTopology combiner is throwing a large number of the exception IndexError('list index out of range',) in production.\n", "before_files": [{"content": "\"\"\"\nSimultaneous Multithreading (SMT) combiner\n==========================================\n\nCombiner for Simultaneous Multithreading (SMT). It uses the results of the following parsers:\n:class:`insights.parsers.smt.CpuCoreOnline`,\n:class:`insights.parsers.smt.CpuSiblings`.\n\"\"\"\n\nfrom insights.core.plugins import combiner\nfrom insights.parsers.smt import CpuCoreOnline, CpuSiblings\n\n\n@combiner(CpuCoreOnline, CpuSiblings)\nclass CpuTopology(object):\n    \"\"\"\n    Class for collecting the online/siblings status for all CPU cores.\n\n    Sample output of the ``CpuCoreOnline`` parser is::\n\n        [[Core 0: Online], [Core 1: Online], [Core 2: Online], [Core 3: Online]]\n\n    Sample output of the ``CpuSiblings`` parser is::\n\n        [[Core 0 Siblings: [0, 2]], [Core 1 Siblings: [1, 3]], [Core 2 Siblings: [0, 2]], [Core 3 Siblings: [1, 3]]]\n\n    Attributes:\n        cores (list of dictionaries): List of all cores.\n        all_solitary (bool): True, if hyperthreading is not used.\n\n    Examples:\n        >>> type(cpu_topology)\n        <class 'insights.combiners.smt.CpuTopology'>\n        >>> cpu_topology.cores == [{'online': True, 'siblings': [0, 2]}, {'online': True, 'siblings': [1, 3]}, {'online': True, 'siblings': [0, 2]}, {'online': True, 'siblings': [1, 3]}]\n        True\n        >>> cpu_topology.all_solitary\n        False\n    \"\"\"\n\n    def __init__(self, cpu_online, cpu_siblings):\n        self.cores = []\n\n        max_cpu_core_id = max([core.core_id for core in cpu_online])\n        for n in range(max_cpu_core_id + 1):\n            online = [core for core in cpu_online if core.core_id == n]\n            online = online[0].on\n            siblings = [sibling for sibling in cpu_siblings if sibling.core_id == n]\n            if len(siblings) != 0:\n                siblings = siblings[0].siblings\n\n            one_core = {\"online\": online, \"siblings\": siblings}\n            self.cores.append(one_core)\n\n        self.all_solitary = all([len(core[\"siblings\"]) <= 1 for core in self.cores])\n\n    def online(self, core_id):\n        \"\"\"\n        Returns bool value obtained from \"online\" file for given core_id.\n        \"\"\"\n        if core_id >= len(self.cores) or core_id < 0:\n            return None\n        return self.cores[core_id][\"online\"]\n\n    def siblings(self, core_id):\n        \"\"\"\n        Returns list of siblings for given core_id.\n        \"\"\"\n        if core_id >= len(self.cores) or core_id < 0:\n            return None\n        return self.cores[core_id][\"siblings\"]\n", "path": "insights/combiners/smt.py"}], "after_files": [{"content": "\"\"\"\nSimultaneous Multithreading (SMT) combiner\n==========================================\n\nCombiner for Simultaneous Multithreading (SMT). It uses the results of the following parsers:\n:class:`insights.parsers.smt.CpuCoreOnline`,\n:class:`insights.parsers.smt.CpuSiblings`.\n\"\"\"\n\nfrom insights.core.plugins import combiner\nfrom insights.parsers.smt import CpuCoreOnline, CpuSiblings\n\n\n@combiner(CpuCoreOnline, CpuSiblings)\nclass CpuTopology(object):\n    \"\"\"\n    Class for collecting the online/siblings status for all CPU cores.\n\n    Sample output of the ``CpuCoreOnline`` parser is::\n\n        [[Core 0: Online], [Core 1: Online], [Core 2: Online], [Core 3: Online]]\n\n    Sample output of the ``CpuSiblings`` parser is::\n\n        [[Core 0 Siblings: [0, 2]], [Core 1 Siblings: [1, 3]], [Core 2 Siblings: [0, 2]], [Core 3 Siblings: [1, 3]]]\n\n    Attributes:\n        cores (list of dictionaries): List of all cores.\n        all_solitary (bool): True, if hyperthreading is not used.\n\n    Examples:\n        >>> type(cpu_topology)\n        <class 'insights.combiners.smt.CpuTopology'>\n        >>> cpu_topology.cores == [{'online': True, 'siblings': [0, 2]}, {'online': True, 'siblings': [1, 3]}, {'online': True, 'siblings': [0, 2]}, {'online': True, 'siblings': [1, 3]}]\n        True\n        >>> cpu_topology.all_solitary\n        False\n    \"\"\"\n\n    def __init__(self, cpu_online, cpu_siblings):\n        self.cores = []\n\n        max_cpu_core_id = max([core.core_id for core in cpu_online])\n        for n in range(max_cpu_core_id + 1):\n            online = [core for core in cpu_online if core.core_id == n]\n            # On some boxes cpu0 doesn't have the online file, since technically cpu0 will always\n            # be online. So check if online returns anything before trying to access online[0].\n            # If it returns nothing and n is 0 set online to True.\n            if online:\n                online = online[0].on\n            elif not online and n == 0:\n                online = True\n            siblings = [sibling for sibling in cpu_siblings if sibling.core_id == n]\n            if len(siblings) != 0:\n                siblings = siblings[0].siblings\n\n            one_core = {\"online\": online, \"siblings\": siblings}\n            self.cores.append(one_core)\n\n        self.all_solitary = all([len(core[\"siblings\"]) <= 1 for core in self.cores])\n\n    def online(self, core_id):\n        \"\"\"\n        Returns bool value obtained from \"online\" file for given core_id.\n        \"\"\"\n        if core_id >= len(self.cores) or core_id < 0:\n            return None\n        return self.cores[core_id][\"online\"]\n\n    def siblings(self, core_id):\n        \"\"\"\n        Returns list of siblings for given core_id.\n        \"\"\"\n        if core_id >= len(self.cores) or core_id < 0:\n            return None\n        return self.cores[core_id][\"siblings\"]\n", "path": "insights/combiners/smt.py"}]}