Fatal Root Error: @SUB=Minuit2 VariableMetricBuilder Initial matrix not pos.def

Dear experts,
I’ve got this [1] error from a DQM application running for the CMS experiment:
The error message says:
Fatal Root Error: @SUB=Minuit2 VariableMetricBuilder Initial matrix not pos.def.

Is it normal behavior for ROOT to crash for a matrix that is not positively defined?
If yes, then I’ll investigate more in-depth the DQM application.

Many thanks,

  • Mauro.

[1]

-- starting process: ['cmsRun', '/cmsnfsdqmdata/dqmdata/dqm_cmssw/production_0525_CMSSW_12_3_4_patch2_38083/src/DQM/Integration/python/clients/beampixel_dqm_sourceclient-live_cfg.py', 'runInputDir=/fff/BU0/ramdisk', 'runNumber=352425', 'runkey=pp_run', 'runUniqueKey=63421146-d869-470d-951a-80142c3fc6d4'] --
Initial Source settings: cms.Source("DQMStreamerReader",
    SelectEvents = cms.untracked.vstring('*'),
    delayMillis = cms.untracked.uint32(500),
    deleteDatFiles = cms.untracked.bool(False),
    endOfRunKills = cms.untracked.bool(True),
    inputFileTransitionsEachEvent = cms.untracked.bool(False),
    minEventsPerLumi = cms.untracked.int32(1),
    nextLumiTimeoutMillis = cms.untracked.int32(240000),
    runInputDir = cms.untracked.string('/fff/BU0/ramdisk'),
    runNumber = cms.untracked.uint32(352425),
    scanOnce = cms.untracked.bool(False),
    skipFirstLumis = cms.untracked.bool(False),
    streamLabel = cms.untracked.string('streamDQM')
)

Loaded configuration file from: ['/etc/dqm_run_config']
dqmRunConfig: cms.PSet(
    collectorHost = cms.untracked.string('dqm-prod-local.cms'),
    collectorPort = cms.untracked.int32(9090),
    type = cms.untracked.string('production')
)
[beampixel_dqm_sourceclient-live_cfg]::running pp
[beampixel_dqm_sourceclient-live_cfg]::saving DIP file into cms.string('/nfshome0/dqmpro/BeamMonitorDQM/BeamPixelResults.txt')
Monitoring pipe: /tmp/dqm_monitoring/.es_monitoring_pid00021022
27-May-2022 11:18:45 CEST  Waiting for the first lumi in order to initialize.
27-May-2022 11:19:40 CEST  Found and skipped json file (stream label mismatch, streamDQMEventDisplay [files] != streamDQM [config]): /fff/BU0/ramdisk/run352425/run352425_ls0001_streamDQMEventDisplay_sm-c2a11-43-01.jsn
27-May-2022 11:19:51 CEST  Found and loaded json file: /fff/BU0/ramdisk/run352425/run352425_ls0001_streamDQM_sm-c2a11-43-01.jsn
27-May-2022 11:19:51 CEST  Initiating request to open file /fff/BU0/ramdisk/run352425/run352425_ls0001_streamDQM_sm-c2a11-43-01.dat
27-May-2022 11:19:51 CEST  Successfully opened file /fff/BU0/ramdisk/run352425/run352425_ls0001_streamDQM_sm-c2a11-43-01.dat
27-May-2022 11:19:51 CEST  DQMStreamerReader initialised.
Begin processing the 1st record. Run 352425, Event 594356, LumiSection 1 on stream 0 at 27-May-2022 11:19:55.087 CEST
%MSG-w SiStripRawToDigi:  SiStripRawToDigiModule:siStripDigis  27-May-2022 11:20:03 CEST Run: 352425 Event: 594356
NULL pointer to FEDRawData for FED: id 79
Note: further warnings of this type will be suppressed (this can be changed by enabling debugging printout)
%MSG
PersistencyIO    INFO  +++ Set Streamer to dd4hep::OpaqueDataBlock
DD4hep           WARN  ++ Using globally Geant4 unit system (mm,ns,MeV)
DD4CMS           INFO  +++ Processing the CMS detector description xml-memory-buffer
Detector         INFO  *********** Created World volume with size: 101000 101000 450000
Detector         INFO  +++ Patching names of anonymous shapes....
DDDefinition     INFO  +++ Finished processing xml-memory-buffer
27-May-2022 11:20:09 CEST  Found and skipped json file (stream label mismatch, streamDQMEventDisplay [files] != streamDQM [config]): /fff/BU0/ramdisk/run352425/run352425_ls0002_streamDQMEventDisplay_sm-c2a11-43-01.jsn
Begin processing the 2nd record. Run 352425, Event 807850, LumiSection 1 on stream 0 at 27-May-2022 11:20:09.032 CEST
...
%MSG-w DAClusterizerinZ_vect:  PrimaryVertexProducer:pixelVertices  27-May-2022 11:20:09 CEST Run: 352425 Event: 105207
rejected track t_tkwt 1.62872e-68
%MSG
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27-May-2022 12:44:23 CEST  Closed file /fff/BU0/ramdisk/run352425/run352425_ls0218_streamDQM_sm-c2a11-43-01.dat
27-May-2022 12:44:28 CEST  Found and skipped json file (stream label mismatch, streamDQMCalibration [files] != streamDQM [config]): /fff/BU0/ramdisk/run352425/run352425_ls0219_streamDQMCalibration_sm-c2a11-43-01.jsn
27-May-2022 12:44:28 CEST  Found and skipped json file (stream label mismatch, streamDQMOnlineBeamspot [files] != streamDQM [config]): /fff/BU0/ramdisk/run352425/run352425_ls0219_streamDQMOnlineBeamspot_sm-c2a11-43-01.jsn
2022-05-27 12:44:35.424 DQMNet[23080]: WARNING: source not responding in 0.5s to update, releasing 'BeamPixel/EventInfo/reportSummaryMap' from wait, have 668 data available
27-May-2022 12:44:38 CEST  Found and loaded json file: /fff/BU0/ramdisk/run352425/run352425_ls0219_streamDQM_sm-c2a11-43-01.jsn
27-May-2022 12:44:38 CEST  Initiating request to open file /fff/BU0/ramdisk/run352425/run352425_ls0219_streamDQM_sm-c2a11-43-01.dat
27-May-2022 12:44:38 CEST  Successfully opened file /fff/BU0/ramdisk/run352425/run352425_ls0219_streamDQM_sm-c2a11-43-01.dat
27-May-2022 12:44:39 CEST  Writing DQM Root file: ./upload/DQM_V0001_BeamPixel_R000352425.root
DQMFileSaver::globalEndRun()
27-May-2022 12:44:40 CEST  Deleting old snapshot (root): ./upload/DQM_V0001_BeamPixel_R000352425.root.ls00000210_hostfu-c2f11-11-04_pid00023080
----- Begin Fatal Exception 27-May-2022 12:44:41 CEST-----------------------
An exception of category 'FatalRootError' occurred while
   [0] Processing global end LuminosityBlock run: 352425 luminosityBlock: 218
   [1] Calling method for module Vx3DHLTAnalyzer/'pixelVertexDQM'
   Additional Info:
      [a] Fatal Root Error: @SUB=Minuit2
VariableMetricBuilder Initial matrix not pos.def.

----- End Fatal Exception -------------------------------------------------
%MSG-w SiStripRawToDigi:  SiStripRawToDigiModule:siStripDigis@endStream  27-May-2022 12:44:41 CEST PostEndProcessBlock
[sistrip::RawToDigiUnpacker::createDigis] warnings:
NULL pointer to FEDRawData for FED (1408695)
%MSG

=============================================

MessageLogger Summary

 type     category        sev    module        subroutine        count    total
 ---- -------------------- -- ---------------- ----------------  -----    -----
    1 DAClusterizerinZ_vec -w PrimaryVertexPro                    1839     1839
    2 PrimaryVertexProduce -w PrimaryVertexPro                      48       48
    3 SiStripRawToDigi     -w SiStripRawToDigi                       1        1
    4 SiStripRawToDigi     -w SiStripRawToDigi                       1        1
    5 Fatal Exception      -s                                        1        1
    6 fileAction           -s DD4hep_VolumeBas                      27       27
    7 fileAction           -s DD4hep_VolumeBas                       2        2
    8 fileAction           -s DQMStreamerReade                       6        6
    9 fileAction           -s PostModuleEvent                     1317     1317

 type    category    Examples: run/evt        run/evt          run/evt
 ---- -------------------- ---------------- ---------------- ----------------
    1 DAClusterizerinZ_vect 352425/105207    352425/381953    352425/212345375
    2 PrimaryVertexProducer 352425/3332155   352425/3443390   352425/207125194
    3 SiStripRawToDigi     352425/594356                     
    4 SiStripRawToDigi     PostEndProcessBl                  
    5 Fatal Exception      PostEndProcessBl                  
    6 fileAction           Run: 352425 Lumi Run: 352425 Lumi Run: 352425 Lumi
    7 fileAction           End Run: 352425  End Run: 352425  
    8 fileAction           pre-events       pre-events       pre-events
    9 fileAction           PostProcessEvent PostProcessEvent PostProcessEvent

Severity    # Occurrences   Total Occurrences
--------    -------------   -----------------
Warning              1889                1889
System               1353                1353

dropped waiting message count 0
27-May-2022 12:44:41 CEST  Closed file /fff/BU0/ramdisk/run352425/run352425_ls0219_streamDQM_sm-c2a11-43-01.dat

-- process exit: 86 --

_ROOT Version: ROOT 6.24/07
_Platform: CENTOS7
_Compiler: unknown


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Hi @mauroroot ,

sorry for the high latency, this post must have slipped through the cracks.

I think we need @moneta to comment here, let’s ping him.

Cheers,
Enrico

Hi,
When the initial matrix is not positive defined Minuit2 exits returning a failure code, but it is not producing a fatal error but only an error message.
It is probably your application that is transforming the error message in a Fatal error.

Lorenzo

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