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Bug#582664: marked as done (ocaml dbm: segmentation faults and fatal errors)

Your message dated Sun, 16 Aug 2015 21:36:21 +0000
with message-id <[🔎] E1ZR5bJ-0004QY-L5@franck.debian.org>
and subject line Bug#795302: Removed package(s) from unstable
has caused the Debian Bug report #582664,
regarding ocaml dbm: segmentation faults and fatal errors
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
582664: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=582664
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: ocaml
Version: 3.11.2-1
Severity: normal

While testing how the Dbm can be used I got 2 errors with a corrupt dbm file.
The test program DOES have the entire ML code wrapped in a try block, which
works:
$ ocaml dbm.cma foo.ml
OK
Exception: Not found

Now copy the (intentionally) corrupted dbm file attached to this bugreport:
$ cp corrupt.pag data.db.pag

1. If the DB is corrupt I get a gdbm fatal error that kills the ML program
$ ocaml dbm.cma foo.ml
gdbm fatal: lseek error

I think gdbm has a way to set a fatal error hook, which OCaml apparently isn't
using.

2. And under some circumstances OCaml even segfaults with a corrupt dbm file
(although it might be a bug in gdbm, I don't know):
$ ocamlc dbm.cma foo.ml
$ ocaml
        Objective Caml version 3.11.2

# #load "dbm.cma";;
# #load "foo.ml";;
File foo.ml is not a bytecode object file.
# #load "foo.cmo";;
Segmentation fault

This doesn't immediately segfault, but gives valgrind warning:
valgrind /usr/bin/ocamlrun /usr/bin/ocaml
==12557== Memcheck, a memory error detector
==12557== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al.
==12557== Using Valgrind-3.5.0-Debian and LibVEX; rerun with -h for copyright info
==12557== Command: /usr/bin/ocamlrun /usr/bin/ocaml
==12557== 
        Objective Caml version 3.11.2

# #load "dbm.cma";;
# #load "foo.cmo";;
==12557== Invalid read of size 8
==12557==    at 0x3CEAA03488: _gdbm_get_bucket (in /usr/lib/libgdbm.so.3.0.0)
==12557==    by 0x3CEAA04048: _gdbm_findkey (in /usr/lib/libgdbm.so.3.0.0)
==12557==    by 0x3CEAA02156: gdbm_fetch (in /usr/lib/libgdbm.so.3.0.0)
==12557==    by 0x5494434: dbm_fetch (in /usr/lib/libgdbm_compat.so.3.0.0)
==12557==    by 0x5291ED2: caml_dbm_fetch (in /usr/lib/ocaml/stublibs/dllmldbm.so)
==12557==    by 0x41AFDE: caml_interprete (in /usr/bin/ocamlrun)
==12557==    by 0x41C8B9: caml_main (in /usr/bin/ocamlrun)
==12557==    by 0x419C0F: main (in /usr/bin/ocamlrun)
==12557==  Address 0x5127838 is not stack'd, malloc'd or (recently) free'd
==12557== 
OK

Here is foo.ml:
Printexc.record_backtrace true;
try
    let db = Dbm.opendbm "data.db" [Dbm.Dbm_rdwr; Dbm.Dbm_create] 0o666 in
        print_string "OK\n";
        print_string (Dbm.find db "data");
    Dbm.close db
with e ->
    Printf.eprintf "Exception: %s\n" (Printexc.to_string e);
    Printexc.print_backtrace stderr;

-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.34-rc5-00118-gf259493 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages ocaml depends on:
ii  libx11-dev                    2:1.3.3-3  X11 client-side library (developme
ii  ocaml-base [ocaml-base-3.11.2 3.11.2-1   Runtime system for OCaml bytecode 
ii  ocaml-nox [ocaml-nox-3.11.2]  3.11.2-1   ML implementation with a class-bas

ocaml recommends no packages.

Versions of packages ocaml suggests:
pn  tcl8.5-dev                    <none>     (no description available)
pn  tk8.5-dev                     <none>     (no description available)

-- no debconf information

Attachment: corrupt.db.pag
Description: application/gdbm


--- End Message ---
--- Begin Message --- 
Version: 1.0-2+rm

Dear submitter,

as the package camldbm has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/795302

The version of this package that was in Debian prior to this removal
can still be found using http://snapshot.debian.org/.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Scott Kitterman (the ftpmaster behind the curtain)

--- End Message ---
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