[erlang-bugs] zlib binary fails to round trip

Paul Mineiro <>
Wed Jan 23 19:11:06 CET 2008


Gentlemen,

I can only reproduce this on a feisty box running 11b-2 (my bad, didn't
notice the version difference at first). My mac has 11b-5 and doesn't have
the problem.

However, the problem under 11b-2 is data dependent so it's possible that
it still exists under 11b-5 and we just don't know how to tickle it.  Do
you have an 11b-2 setup you can fire up to investigate?

I've attached a file called "mega" with the bad data in it to
disambiguate.

Thanks,

-- p

3> [ zlib:unzip (zlib:zip (Bin)) || { ok, Bin } <- [ file:read_file ("mega") ] ].
=ERROR REPORT==== 23-Jan-2008::10:04:42 ===
Error in process <0.32.0> with exit value: {data_error,[{zlib,call,3},{zlib,unzip,1},{erl_eval,do_apply,5},{erl_eval,eval_lc1,5},{lists,flatmap,2},{erl_eval,eval_lc,6},{shell,exprs,6},{shell,eval_loop,3}]}

** exited: {data_error,[{zlib,call,3},
                        {zlib,unzip,1},
                        {erl_eval,do_apply,5},
                        {erl_eval,eval_lc1,5},
                        {lists,flatmap,2},
                        {erl_eval,eval_lc,6},
                        {shell,exprs,6},
                        {shell,eval_loop,3}]} **
4> [ Compile || { compile, Compile } <- zlib:module_info () ].
[[{options,[{cwd,"/build/buildd/erlang-11.b.2/lib/kernel/src"},
            {outdir,"/build/buildd/erlang-11.b.2/lib/kernel/src/../ebin"},
            {i,"/build/buildd/erlang-11.b.2/lib/kernel/src/../include"},
            debug_info]},
  {version,"4.4.2"},
  {time,{2007,1,23,12,4,54}},
  {source,"/build/buildd/erlang-11.b.2/lib/kernel/src/zlib.erl"}]]

On Wed, 23 Jan 2008, Matthias Lang wrote:

> Matthew Dempsky writes:
>  > On 1/22/08, Paul Mineiro <> wrote:
>  > > Interestingly enough, removing either the first or last character from this binary eliminates the problem.
>  >
>  > I can't reproduce this with either R11B-5 or R12B-0, but I suspect the
>  > word wrapping is at fault.  Can you send this binary again, but using
>  > the output from io:write/1?
>
> I can't reproduce it either, but I took some guesses about what the
> input data was (it got wrapped).
>
> Matthias
>

Optimism is an essential ingredient of innovation. How else can the
individual favor change over security?

  -- Robert Noyce
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