[erlang-questions] Why does this not work in the latest otp

Raimo Niskanen <>
Fri Jun 26 14:58:11 CEST 2009


Congratulations, you have found a serious bug in
the new atom cache code!

Simply when sending [] (the empty list) as the _complete_
message to a remote process, decoding fails in R13B01.
That is serious and it is interesting to note that
sending [] as the complete message between remote
processes must be _very_ uncommon, oddly enough.
You are the only one so far that has encountered it.

The developer that wrote the new atom cache (now on vacation)
has given me a two-line patch to regression test. First shot
on one platform works fine and I do not expect any problems.
Next week I will post the patch if the regression tests run fine.



On Wed, Jun 24, 2009 at 03:17:02PM +0100, Thomas James Malone wrote:
> 
> 
> If I use the module I have included as an attachement and run the  
> following code in R13B01,
> 
> db_dis:new(database, ).
> db_dis:write(tom, london, database, ).
> db_dis:write(stuart, london, database, ).
> db_dis:match(tom, database, ).
> 
> 
> =ERROR REPORT==== 24-Jun-2009::15:13:11 ===
> '' got a corrupted external term from '' on  
> distribution channel 5571
> <<...,106>>
> ATOM_CACHE_REF translations: 0='', 1=''
> timeout
> 
> In R12B-5 if  run the same code I get my expected response of []
> 
> what am I missing.
> 
> thanks in advance
> 
> Tom

> 
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-- 

/ Raimo Niskanen, Erlang/OTP, Ericsson AB


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