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

Subject: RE: Possible Bug in 3.14.9 Access Security on mv2100
From: "Jeff Hill" <[email protected]>
To: "'Ralph Lange'" <[email protected]>, "'Steven Hartman'" <[email protected]>, "'EPICS core-talk'" <[email protected]>
Date: Thu, 9 Aug 2007 10:33:46 -0600
> More observations from Steven:
>
> Now, I just rebuilt all of base on linux with HOST_OPT=NO. Even stranger.
> Using optimized build on linux, caget failed with an unexpected read 
> access error 19 out of 20 times just tested. Using non-optimized build 
> on linux, caget failed 2 out of 20 times!

This appears to be a major hint. I need to confirm that the behavior changed
this way (as described above) when the CA client library's optimization
level changes, and that during this experiment the IOC's optimization level
was not changed.

Jeff

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of Ralph Lange
Sent: Wednesday, August 08, 2007 9:46 AM
To: EPICS Tech Talk
Subject: Re: Possible Bug in 3.14.9 Access Security on mv2100

More observations from me:

I can also see the faulty behaviour against a Linux 3.14.9 IOC. 
Including the statistical behaviour that Steven was reporting. Some of 
the caget calls get the unexpected "no read", others don't. On the same 
Linux host, caget fails about 20%. Cross to vxWorks mv2100 IOC, caget 
fails 100%. Camonitor works all the time, against all type IOCs.

Rebuilding Base 3.14.9 with the as subdirectory from 3.14.8.2 does not 
change the faulty behaviour at all. The as parser cleanup things got away.


More observations from Steven:

I already have optimization turned off for the cross compiler (have been 
bit by that on VxWorks before) but have host optimization on. I tried 
turning off host optimization and recompiling caget on linux, but the 
problem remained.

Now, I just rebuilt all of base on linux with HOST_OPT=NO. Even stranger.
Using optimized build on linux, caget failed with an unexpected read 
access error 19 out of 20 times just tested. Using non-optimized build 
on linux, caget failed 2 out of 20 times!


Houston, we have a problem.

Ralph


Replies:
RE: Possible Bug in 3.14.9 Access Security on mv2100 Steven Hartman
Re: Possible Bug in 3.14.9 Access Security on mv2100 Ralph Lange

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