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<== Date ==> <== Thread ==>

Subject: Re: IOC error
From: Eric Norum <eric@norum.ca>
To: "Kasemir, Kay" <kasemirk@ornl.gov>
Cc: "tech-talk@aps.anl.gov Talk" <tech-talk@aps.anl.gov>
Date: Thu, 25 Jan 2018 08:38:03 -0800
From the order of the messages I suspect that the ring buffer overflow is because the cbLow thread has suspended itself due to the assertion failure.  The assertion fails because a record is attempting put notification completion but the ppn field is 0.  
> On Jan 25, 2018, at 8:20 AM, Kasemir, Kay <kasemirk@ornl.gov> wrote:
> 
> Hi:
> 
>> I was wondering if anyone might know what could be causing the error in the attached screenshot. This is from an EPICS IOC with custom device support running on Windows. It or a similar error >seems to occur at random  times and requires the IOC to be restarted.
> (screenshot shows cbLow/cbHigh ring buffer overflow)
> 
> I think you can get an overflow of the callback buffer if you have device support that uses SCAN=I/O Intr and calls
> scanIoRequest() faster than the callback task can process the requested callbacks.
> 
> -Kay

-- 
Eric Norum
eric@norum.ca





References:
IOC error Thomas, Patrick
Re: IOC error Kasemir, Kay

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