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CPUs with empty lpid on Graviton 4 #3
Description
I got this exception from cmn_capture.py:
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "__main__.py", line 233, in <module>
sys.exit(main())
^^^^^^
File "__main__.py", line 195, in main
dataset = collect_mapping(options)
^^^^^^^^^^^^^^^^^^^^^^^^
File "collect.py", line 54, in collect_mapping
with CaptureSession(
^^^^^^^^^^^^^^^
File "capture.py", line 145, in __init__
self._session = cmn_capture.TraceSession(
^^^^^^^^^^^^^^^^^^^^^^^^^
File "cmn-tools/src/cmn_capture.py", line 507, in __init__
handler.set_cmns(list(self.CMNs())) # The trace visualizer
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "cmn-tools/src/cmn_capture.py", line 203, in set_cmns
self.build_id_map()
File "cmn-tools/src/cmn_capture.py", line 220, in build_id_map
for k in sorted(self.id_map.keys()):
^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: '<' not supported between instances of 'NoneType' and 'int
Printing self.id_map.keys() produced this (note last two):
ID map:
dict_keys([(0, 0, 0), (0, 2, 0), (0, 4, 0), (0, 8, 0), (0, 12, 0), (0, 16, 0), (0, 20, 0), (0, 24, 0), (0, 28, 0), (0, 32, 0), (0, 36, 0), (0, 40, 0), (0, 44, 0), (0, 48, 0), (0, 52, 0), (0, 56, 0), (0, 60, 0), (0, 64, 0), (0, 66, 0), (0, 68, 0), (0, 128, 0), (0, 130, 0), (0, 132, 0), (0, 133, 0), (0, 136, 0), (0, 137, 0), (0, 140, 0), (0, 141, 0), (0, 144, 0), (0, 145, 0), (0, 148, 0), (0, 149, 0), (0, 152, 0), (0, 153, 0), (0, 156, 0), (0, 157, 0), (0, 160, 0), (0, 161, 0), (0, 164, 0), (0, 165, 0), (0, 168, 0), (0, 169, 0), (0, 172, 0), (0, 173, 0), (0, 176, 0), (0, 177, 0), (0, 180, 0), (0, 181, 0), (0, 184, 0), (0, 185, 0), (0, 188, 0), (0, 189, 0), (0, 192, 0), (0, 193, 0), (0, 196, 0), (0, 197, 0), (0, 256, 0), (0, 258, 0), (0, 260, 0), (0, 264, 0), (0, 265, 0), (0, 268, 0), (0, 269, 0), (0, 272, 0), (0, 273, 0), (0, 276, 0), (0, 277, 0), (0, 280, 0), (0, 281, 0), (0, 284, 0), (0, 285, 0), (0, 288, 0), (0, 289, 0), (0, 292, 0), (0, 293, 0), (0, 296, 0), (0, 297, 0), (0, 300, 0), (0, 301, 0), (0, 304, 0), (0, 305, 0), (0, 308, 0), (0, 309, 0), (0, 312, 0), (0, 313, 0), (0, 316, 0), (0, 317, 0), (0, 320, 0), (0, 321, 0), (0, 324, 0), (0, 325, 0), (0, 384, 0), (0, 386, 0), (0, 388, 0), (0, 389, 0), (0, 392, 0), (0, 393, 0), (0, 396, 0), (0, 397, 0), (0, 400, 0), (0, 401, 0), (0, 404, 0), (0, 405, 0), (0, 408, 0), (0, 409, 0), (0, 412, 0), (0, 413, 0), (0, 416, 0), (0, 417, 0), (0, 420, 0), (0, 421, 0), (0, 424, 0), (0, 425, 0), (0, 428, 0), (0, 429, 0), (0, 432, 0), (0, 433, 0), (0, 436, 0), (0, 437, 0), (0, 440, 0), (0, 441, 0), (0, 444, 0), (0, 445, 0), (0, 448, 0), (0, 449, 0), (0, 452, 0), (0, 453, 0), (0, 512, 0), (0, 513, 0), (0, 516, 0), (0, 517, 0), (0, 520, 0), (0, 521, 0), (0, 524, 0), (0, 525, 0), (0, 528, 0), (0, 529, 0), (0, 532, 0), (0, 533, 0), (0, 536, 0), (0, 537, 0), (0,540, 0), (0, 541, 0), (0, 544, 0), (0, 545, 0), (0, 548, 0), (0, 549, 0), (0, 552, 0), (0, 553, 0), (0, 556, 0), (0, 557, 0), (0, 560, 0), (0, 561, 0),(0, 564, 0), (0, 565, 0), (0, 568, 0), (0, 569, 0), (0, 572, 0), (0, 573, 0), (0, 576, 0), (0, 577, 0), (0, 580, 0), (0, 581, 0), (0, 640, 0), (0, 641,0), (0, 644, 0), (0, 645, 0), (0, 648, 0), (0, 649, 0), (0, 652, 0), (0, 653, 0), (0, 656, 0), (0, 657, 0), (0, 660, 0), (0, 661, 0), (0, 664, 0), (0, 665, 0), (0, 668, 0), (0, 669, 0), (0, 672, 0), (0, 673, 0), (0, 676, 0), (0, 677, 0), (0, 680, 0), (0, 681, 0), (0, 684, 0), (0, 685, 0), (0, 688, 0), (0, 689, 0), (0, 692, 0), (0, 693, 0), (0, 696, 0), (0, 697, 0), (0, 700, 0), (0, 701, 0), (0, 704, 0), (0, 706, 0), (0, 708, 0), (0, 709, 0), (0, 768, 0), (0, 769, 0), (0, 772, 0), (0, 773, 0), (0, 776, 0), (0, 777, 0), (0, 780, 0), (0, 781, 0), (0, 784, 0), (0, 785, 0), (0, 788, 0), (0, 789, 0), (0, 792, 0), (0, 793, 0), (0, 796, 0), (0, 797, 0), (0, 800, 0), (0, 801, 0), (0, 804, 0), (0, 805, 0), (0, 808, 0), (0, 809, 0), (0, 812, 0), (0, 813, 0), (0, 816, 0), (0, 817, 0), (0, 820, 0), (0, 821, 0), (0, 824, 0), (0, 825, 0), (0, 828, 0), (0, 829, 0), (0, 832, 0), (0, 834, 0), (0, 836, 0), (0, 896, 0), (0, 898, 0), (0, 900, 0), (0, 904, 0), (0, 908, 0), (0, 912, 0), (0, 916, 0), (0, 920, 0), (0, 924, 0), (0, 928, 0), (0, 932, 0), (0, 936, 0), (0, 940, 0), (0, 944, 0), (0, 948, 0), (0, 952, 0), (0, 956, 0), (0, 960, 0), (0, 962, 0), (0, 964, 0), (0, 965, 0), (0, 700, None), (0, 580, None)])
A quick look at ~/.cache/arm/cmn-system.json:
{
"port": 1,
"type": 25,
"type_s": "RN-F_E_E",
"cal": 2,
"ccs": 1,
"pdevices": [
{
"device_number": 0,
"id": 580
}
],
"devices": [
{
"id": 580,
"type": 15,
"type_s": "RN-SAM"
}
],
"attached": [
{
"type": "cpu",
"cpu": 81,
"mseq": 0,
"id": 580,
"lpid": null
}
]
}So maybe cmn_detect_cpu.py or perhaps the arm_cmn module is bugged on this platform.
Activity
algrant-arm commentedon Aug 19, 2026
Thanks for the report, and apologies for late response. We are struggling to replicate this, it might be an effect of the ways CPUs are placed on this particular instance. From the id_map output it looks like there's another entry for node 580, i.e. (0, 580, 0) and then the sort fails when it compares against (0, 580, None). This shouldn't happen. Does your JSON have another entry with "id": 580?