[erlang-bugs] mnesia/dets breakage when otp R15B03-1 is compiled by gcc 4.8 or 4.9

Lukas Larsson <>
Wed Dec 4 18:03:11 CET 2013


Hello,

Could it be OTP-11246? It is the only gcc version related patch that I 
can think of.

Lukas

On 04/12/13 15:00, Mikael Pettersson wrote:
> We're using otp R15B03-1 on x86_64-linux.  During initialization of our
> application we create a bunch of mnesia disc_copies tables.  If otp
> was compiled by gcc 4.8 or 4.9, then during the creation of the 257th
> mnesia table DETS spews the following warning
>
> dets: file "/...//schema.DAT" not properly closed, repairing ...
>
> but the mnesia:create_table/2 call doesn't fail.  However the schema.DAT
> file is corrupt and subsequent usage of mnesia fails.
>
> If otp R15B03-1 is compiled with gcc 4.7 or 4.6 the problem doesn't occur.
>
> If we use otp R16B02 compiled by gcc 4.8 or 4.9 the problem doesn't occur.
>
> At the moment we can't upgrade to R16B02, and as our developers upgrade their
> machines to newer Linux distributions they get gcc-4.8 as their system compiler
> and things break.
>
> Are there any known bug fixes in R16 that may be related to this?
>
> I'm appending the trivial reproducer below.
>
> /Mikael
>
> -module(bug).
> -compile(export_all).
> doit() ->
>      mnesia:delete_schema([node()]),
>      mnesia:create_schema([node()]),
>      mnesia:start(),
>      doit(0).
>
> doit(I) when I < 260 ->
>      D0 = $0 + (I rem 10),
>      D1 = $0 + ((I div 10) rem 10),
>      D2 = $0 + ((I div 100) rem 10),
>      Name = list_to_atom([$f, $o, $o, D2, D1, D0]),
>      io:format("creating table ~p~n", [Name]),
>      TabDef = [{disc_copies,[node()]}, {type,set}, {attributes,[key,val]}],
>      {atomic, ok} = mnesia:create_table(Name, TabDef),
>      doit(I + 1);
> doit(_I) ->
>      ok.
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