[Mldonkey-bugs] [bug #4499] mldonkey quits randomly with segmentation fault error message

[nobody]

=================== BUG #4499: LATEST MODIFICATIONS ==================
http://savannah.nongnu.org/bugs/?func=detailbug&bug_id=4499&group_id=1409

Changes by: Vincent Galceran <address@hidden>
Date: Sat 11/08/03 at 12:34 (GMT)

------------------ Additional Follow-up Comments ----------------------------
I used electric-fence. There is a bug in mark_slice() which is a function of 
ocaml. This bug looks like corrected in ocaml-3.07pl2 (mldonkey is compiled 
with ocaml-3.06)



I guess gcc-3.3 and the new libc6 are even more restrictives with programs that 
use freeed memories.



So the bug fix is:



download ocaml 3.07pl2:



http://caml.inria.fr/distrib/ocaml-3.07/ocaml-3.07pl2.tar.gz



install it on your system or in mldonkey-2.5-4/patches/local (using 
"./configure --prefix=/path-to/mldonkey-2.5-4/patches/local")



Go in mldonkey-2.5-4 and use this configure command line:



./configure --enable-ocamlver=3.07+2 --disable-gui



Edit src/utils/lib/autoconf.ml

And change the last line:



Before:

type ('a,'b,'c) ml_format = ('a,'b, 'c,'c) format  type ('a,'b,'c) format = 
('a,'b, 'c) ml_format



After:

type ('a,'b,'c) ml_format = ('a,'b, 'c) format  type ('a,'b,'c) format = 
('a,'b, 'c) ml_format



type make, and you'll have a good, fresh and descent mlnet



just copy it over the buggy one.



You'll have to use the old mlgui, but who cares if the gui crashes ?





=================== BUG #4499: FULL BUG SNAPSHOT ===================


Submitted by: tom007                  Project: mldonkey, a free e-Donkey client
Submitted on: Sun 07/27/03 at 12:28
Category:  Core                       Severity:  5 - Major                  
Bug Group:  Segmentation Fault        Resolution:  None                     
Assigned to:  None                    Status:  Open                         
Release:  None                        Release:  2.5.3                       
Platform Version:  Linux i386-i686    Binaries Origin:  None                

Summary:  mldonkey quits randomly with segmentation fault error message

Original Submission:  Hi!



I'm using mldonkey for sharing files. Unfortunatly after a couple of minutes 
(sometimes also hours) my client always quits with an segemtation fault 
message. First I tried the binaries and they had the same bug as the version 
that I compiled by my self. I always used the 2.5.3 stable version from 
mldonkey.org. This is the only thing I can report. Please contact me if you 
have further questions. I hope my logfile will help you solving this problem.



thx

tom



ps: i'm using debian sarge, p2-350, 256 mb ram, with enough free diskspace, i 
only use the webinterface

Follow-up Comments
*******************

-------------------------------------------------------
Date: Sat 11/08/03 at 12:34         By: vspaceg
I used electric-fence. There is a bug in mark_slice() which is a function of 
ocaml. This bug looks like corrected in ocaml-3.07pl2 (mldonkey is compiled 
with ocaml-3.06)



I guess gcc-3.3 and the new libc6 are even more restrictives with programs that 
use freeed memories.



So the bug fix is:



download ocaml 3.07pl2:



http://caml.inria.fr/distrib/ocaml-3.07/ocaml-3.07pl2.tar.gz



install it on your system or in mldonkey-2.5-4/patches/local (using 
"./configure --prefix=/path-to/mldonkey-2.5-4/patches/local")



Go in mldonkey-2.5-4 and use this configure command line:



./configure --enable-ocamlver=3.07+2 --disable-gui



Edit src/utils/lib/autoconf.ml

And change the last line:



Before:

type ('a,'b,'c) ml_format = ('a,'b, 'c,'c) format  type ('a,'b,'c) format = 
('a,'b, 'c) ml_format



After:

type ('a,'b,'c) ml_format = ('a,'b, 'c) format  type ('a,'b,'c) format = 
('a,'b, 'c) ml_format



type make, and you'll have a good, fresh and descent mlnet



just copy it over the buggy one.



You'll have to use the old mlgui, but who cares if the gui crashes ?



-------------------------------------------------------
Date: Wed 11/05/03 at 07:02         By: vspaceg
Actually, it segfaults almost anywhere.



I decreased the number of downloading files: it still segfaults.

-------------------------------------------------------
Date: Mon 11/03/03 at 15:00         By: vspaceg
Interesting backtrace:

#0  0x0823e3fc in invert_pointer_at ()

#1  0x0823e5ff in compact_heap ()

#2  0x0823eb51 in compact_heap_maybe ()

#3  0x08234dee in major_collection_slice ()

#4  0x0823541e in minor_collection ()

#5  0x08234206 in garbage_collection ()

#6  0x0823f0e4 in caml_call_gc ()

#7  0xbffffa08 in ?? ()

#8  0x00000bf7 in ?? ()

#9  0x083683b8 in ?? ()

#10 0x000083bf in ?? ()

#11 0x41616e4c in ?? ()

#12 0x00000803 in ?? ()

#13 0x000001f4 in ?? ()

#14 0x081be9be in BasicSocket__iter_task_243 ()

#15 0xce700000 in ?? ()

#16 0x409bcacf in ?? ()

#17 0x081bf27a in BasicSocket__loop_289 ()

#18 0xbffffa38 in ?? ()

#19 0x081bf0e8 in BasicSocket__loop_289 ()

#20 0x08369144 in ?? ()

#21 0x081dd4ea in List__iter_97 ()

#22 0x40c0cf58 in ?? ()

#23 0x082465ec in CommonMain ()

#24 0x0804d21b in CommonMain__entry ()

#25 0x0804bd15 in startup__code_begin ()

#26 0x0823f212 in caml_start_program ()



There is something that smells bad in the ocaml garbage collector. q

The core size is 58 146 816. I used to set the core limit to 50000kB. Perhaps I 
didn't have got good core files before that.



For newbies:

How to use a core file, in short:



ulimit -c 100000

./mlnet

(core dumped)

gdb -c core ./mlnet

bt



Well it is pretty hard to change ocaml compiler version since it is a patched 
version :-(



-------------------------------------------------------
Date: Mon 11/03/03 at 09:00         By: vspaceg
Same problem for me.

I think this might be a conflict in libraries. So I have compile mldonkey 
(configure with --enable-check) but it still segfaults. So I think one of the 
debian library must be recompiled but I can't figure which one.

I have enabled core dumps (unlimit -c 50000), but it segfault almost anywhere. 
I hate this kind of bug !

-------------------------------------------------------
Date: Thu 08/14/03 at 16:54         By: None
Same problem for me on a redhat 8.0 on a p4 2.4 Ghz with 1 Go of ram and web 
interface. Binary 2.5.3 i686 stable version.



Thx.



Ludovic.


CC list is empty


File Attachments
****************

-------------------------------------------------------
Date: Sun 07/27/03 at 12:30  Name: mldonkey.log  Size: 8KB   By: tom007

http://savannah.nongnu.org/bugs/download.php?group_id=1409&amp;bug_id=4499&amp;bug_file_id=558


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