[daip] [!12307]: AIPS - Underflow, Bus error

[Robert Gray]

Robert Gray updated #12307
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Underflow, Bus error
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           Ticket ID: 12307
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/12307
                Name: Robert Gray
       Email address: roberthansengray at gmail.com
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 07 July 2018 02:30 PM
             Updated: 07 July 2018 02:30 PM
           Reply due: 11 July 2018 12:00 AM (3d 9h 30m)
      Resolution due: 02 April 2021 12:00 AM (999d 9h 30m)

Hi!Any thoughts on why an AIPS procedure is failing with "underflow" and "bus error" as shown in messages at the end of this note, just after IMAGR ends and before a RENAME is done as shown below?    One oddity is that I set TWO procs running, processing different files using a script that makes a 1,000 channel cube and runs SAD on it for each 10-second time range over a 20-minute observation, and they BOTH stopped at the same point in the script - after running IMAGR and SAD on two time ranges, so I think the failure occurs after creating the third cube but before running SAD on it.  The failures were about 5 minutes apart, suggesting it was not hardware related.I have run this proc many times before, and processed these files before using 60-second time ranges, so it's surprising that things are failing now, especially at the same point on two different files, suggesting it's not a bad data issue.  Any suggestions would be much appreciated!  Bob Gray...TIMERANG 0 03 48 38-0.5 0 03 48 46 ; GO IMAGR; WAIT IMAGR;*default RENAME;inname 'M33-CTR-'; inclass 'ICL001'outname 'M33-CTR-'; outclass '034838'; RENAME;*default SAD;inname 'M33-CTR-'; indisk 1; inclass '034838';fitout 'HOME:M33-HI-CTR_CUB_I_2048_1.75_10_4001_5000.SAD';docrt -1; sort 'S'; outvers -1; doall 1;*SRCS(6, 4001, 5000, 2048)*....IMAGR2: Total Cleaned flux density = 1.031 Jy 67 compsIMAGR2: VISDFT: Begin DFT component subtractionIMAGR2: VISDFT: fields 1 - 1 chns 1 - 1 in 1 CC modelsIMAGR2: I Polarization model processedIMAGR2: VISDFT at visibility number 1IMAGR2: Field 1 min = -1.9 Jy,max = 1.8 JyIMAGR2: BGC Clean: using 2043 cell beam + residuals > 120.42 MilliJyIMAGR2: 1192 Residual map points loadedIMAGR2: Reached Iter. limit, Max resid = 372.063 MilliJy iter= 100IMAGR2: Total Cleaned flux density = 1.405 Jy 100 compsIMAGR2: VISDFT: Begin DFT component subtractionIMAGR2: VISDFT: fields 1 - 1 chns 1 - 1 in 1 CC modelsIMAGR2: I Polarization model processedIMAGR2: VISDFT at visibility number 1IMAGR2: Field 1 min = -1.9 Jy,max = 1.8 JyIMAGR2: Total Clean components 100 reaches limit 100IMAGR2: Restoring Clean componentsIMAGR2: Field 1 rescaling by 1.00642 to fix unitsIMAGR2: Checking image max/minIMAGR2: Field 1 final Clean flux 1.405 JyIMAGR2: Deleting UV work file:IMAGR2: Destroyed 1 extension files of type ANIMAGR2: Destroyed 1 extension files of type FQIMAGR2: Destroyed UV image file: catno= 3 disk= 9IMAGR2: Appears to have ended successfullyIMAGR2: nmpost00 31DEC18 TST: Cpu= 5231.5 Real= 6559 IO= 8076128Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG IEEE_DENORMALBus errornmpost009$ ls

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