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<== Date ==> <== Thread ==>
Subject: Re: Weirdness with self-defined record type
From: Ralph Lange via Core-talk <core-talk at aps.anl.gov>
To: EPICS Core Talk <core-talk at aps.anl.gov>
Date: Fri, 10 Jul 2020 19:46:49 +0200
Found it. For the record:

I was using the epicsOldString typedef (deprecated, I know) as a convenient way to have a fixed size string type.
Inside a function with an argument defined as   epicsOldString *text   , I did the "make sure it is null terminated" write as
  *text[MAX_STRING_SIZE-1] = '\0';
instead of
  (*text)[MAX_STRING_SIZE-1] = '\0';

Just rarely, depending on heap memory layout, the '\0' hit specific places in areas of memory with record instances, the structures were corrupted in a way that segfaulted the IOC.

Note to myself: Array typedefs are EVIL.

Thanks for all the hints!
~Ralph

References:
Weirdness with self-defined record type Ralph Lange via Core-talk
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