Experimental Physics and
Industrial Control System

What versions of asyn and stream are you running?

You should the IOC under gdb and run the "backtrace" command when it crashes.  That will give us a stack dump, showing where and why it crashed.

Mark


-----Original Message-----
From: Tech-talk <[email protected]> On Behalf Of Donny Domagoj Cosic via Tech-talk
Sent: Monday, November 11, 2019 3:49 AM
To: [email protected]
Subject: Segmentation fault when Record Processing in StreamDevice

Hi,

I have an IOC to read data from a radiation monitor that continuously send out data, however every so often the device sends out a header which is formatted differently and this is causing a Segmentation fault and crashing the IOC.

The output from the probe:

??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
<\f>User File Number:          1<\r>
<\r>
   Date     Time    M.Time       A           B    <\r>
                     min       uSv/h       uSv/h  <\r>
--------------------------------------------------<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>
??/??/?? ??:??:??     0.1     0.19(1)     0.15(1)<\r>


My DB file:

record (ai, "RAD:P10Probe1")
{
	field(DTYP, "stream")
	field(INP, "@rad.proto getProbe1(RAD:message) PORT10")
	field(SCAN, "I/O Intr")
	field(HIHI, "10.0")
	field(HIGH, "1.0")
	field(HHSV, "MAJOR")
	field(HSV, "MINOR")
	field(LOPR, "0")
	field(EGU, "uS/hr")
}

record (ai, "RAD:P10Probe2")
{
	field(DTYP, "stream")
	field(INP, "@rad.proto getProbe2(RAD:message) PORT10")
	field(SCAN, "I/O Intr")
	field(HIHI, "10.0")
	field(HIGH, "1.0")
	field(HHSV, "MAJOR")
	field(HSV, "MINOR")
	field(LOPR, "0")
	field(EGU, "uS/hr")
}

My proto file:

Terminator = CR;

getProbe1
{
   in "%*8s\_%*8s\_%*f\_%f(%*d)\_%*f(%*d)";
   ExtraInput = Ignore;
   @mismatch
   {
     in "%(\$1)52c";
   }

}

getProbe2
{
   in "%*8s\_%*8s\_%*f\_%*f(%*d)\_%f(%*d)";
   ExtraInput = Ignore;
   @mismatch
   {
     in "%(\$1)52c";
   }

}

I noticed that when the header is received, the mismatch exception handler is not triggered, but this might because the SCAN field is set to "I/O Intr" as the data rate depends on the dose measured at the probe. Why would this reading error cause a Segmentation Error and crash the IOC? Is there any other way read the string from the probe?

Thank you in advance for you time,

Regards,
Donny

--
Donny Domagoj Cosic
  Institut Ruđer Bošković, Bijenička cesta 54, 10000 Zagreb, Croatia

References:

Segmentation fault when Record Processing in StreamDevice Donny Domagoj Cosic via Tech-talk

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