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* [Bug c++/11644] New: Hang in throw when unloading a library
@ 2003-07-23 12:12 peter dot rost at freenet dot de
  2003-07-23 12:17 ` [Bug c++/11644] " peter dot rost at freenet dot de
                   ` (10 more replies)
  0 siblings, 11 replies; 12+ messages in thread
From: peter dot rost at freenet dot de @ 2003-07-23 12:12 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644

           Summary: Hang in throw when unloading a library
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: peter dot rost at freenet dot de
                CC: gcc-bugs at gcc dot gnu dot org

hello,

i found the following which doesn't appears in g++-2.95 but in g++-3.2 and
g++3.3. i'm using debian-linux with the gcc-version 3.3.1 20030626 (Debian
prerelease). the situation is as follows:

i wrote a main program which loads a library and calls a function (defined in
the library) which creates some threads. after a few seconds the main program
tries to unload the library. hence the __fini_lib-function will be called and
tries to finish all threads. but one of these threads throws an exception. and
this throw-call hangs (it wion't be catched!) incl. the rest of the program;)

peter.

the gdb-output of this hang looks like:

#0  0x40150ea9 in sigsuspend () from /lib/libc.so.6
#1  0x4003cd48 in __pthread_wait_for_restart_signal () from /lib/libpthread.so.0
#2  0x4003e9ab in __pthread_lock () from /lib/libpthread.so.0
#3  0x4003b1c8 in pthread_mutex_lock () from /lib/libpthread.so.0
#4  0x4021eb7c in dl_iterate_phdr () from /lib/libc.so.6
#5  0x40124de7 in _Unwind_Find_FDE () from /lib/libgcc_s.so.1
#6  0x40122bd9 in uw_frame_state_for () from /lib/libgcc_s.so.1
#7  0x401230aa in uw_init_context_1 () from /lib/libgcc_s.so.1
#8  0x40123308 in _Unwind_RaiseException () from /lib/libgcc_s.so.1
#9  0x400d4799 in __cxa_throw () from /usr/lib/libstdc++.so.5
#10 0x400207e8 in ?? ()
#11 0x40021006 in ?? ()
#12 0x40020dea in ?? ()
#13 0x4003a1b0 in pthread_start_thread () from /lib/libpthread.so.0


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
@ 2003-07-23 12:17 ` peter dot rost at freenet dot de
  2003-07-23 18:45 ` pinskia at physics dot uc dot edu
                   ` (9 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: peter dot rost at freenet dot de @ 2003-07-23 12:17 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644



------- Additional Comments From peter dot rost at freenet dot de  2003-07-23 12:17 -------
Created an attachment (id=4466)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=4466&action=view)
Sample source code which will hang using g++-3.3 but not using 2.95


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
  2003-07-23 12:17 ` [Bug c++/11644] " peter dot rost at freenet dot de
@ 2003-07-23 18:45 ` pinskia at physics dot uc dot edu
  2003-07-23 19:24 ` peter dot rost at freenet dot de
                   ` (8 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: pinskia at physics dot uc dot edu @ 2003-07-23 18:45 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644



------- Additional Comments From pinskia at physics dot uc dot edu  2003-07-23 18:45 -------
I think unloading a c++ library is not supported.


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
  2003-07-23 12:17 ` [Bug c++/11644] " peter dot rost at freenet dot de
  2003-07-23 18:45 ` pinskia at physics dot uc dot edu
@ 2003-07-23 19:24 ` peter dot rost at freenet dot de
  2003-08-11 12:42 ` pinskia at gcc dot gnu dot org
                   ` (7 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: peter dot rost at freenet dot de @ 2003-07-23 19:24 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644



------- Additional Comments From peter dot rost at freenet dot de  2003-07-23 19:24 -------
Subject: Re:  Hang in throw when unloading a library

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Hash: SHA1

but how could it be, that the throw-statement isn't supported anymore
after the unload of the library has began!?

On Wed, 23 Jul 2003, pinskia at physics dot uc dot edu wrote:

> PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
> 
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644
> 
> 
> 
> ------- Additional Comments From pinskia at physics dot uc dot edu  2003-07-23 18:45 -------
> I think unloading a c++ library is not supported.
> 
> 
> 
> ------- You are receiving this mail because: -------
> You reported the bug, or are watching the reporter.
> 
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kywuWNtN52Ti/67pmpe8GjU=
=gTHv
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^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
                   ` (2 preceding siblings ...)
  2003-07-23 19:24 ` peter dot rost at freenet dot de
@ 2003-08-11 12:42 ` pinskia at gcc dot gnu dot org
  2003-08-19 15:15 ` lerdsuwa at gcc dot gnu dot org
                   ` (6 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-08-11 12:42 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|3.4                         |---


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
                   ` (3 preceding siblings ...)
  2003-08-11 12:42 ` pinskia at gcc dot gnu dot org
@ 2003-08-19 15:15 ` lerdsuwa at gcc dot gnu dot org
  2003-08-19 15:32 ` peter dot rost at freenet dot de
                   ` (5 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: lerdsuwa at gcc dot gnu dot org @ 2003-08-19 15:15 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644



------- Additional Comments From lerdsuwa at gcc dot gnu dot org  2003-08-19 15:15 -------
Two possible problems that make your code not working:

1 You need g++ and libstdc++ that are thread-enabled.
  See this link for more info
    http://gcc.gnu.org/bugs.html#nonbugs_cxx

2 The exception is thrown inside __fini_lib through the
  function call chain:
    main -> unloadLib -> dlclose -> __fini_Lib
  If the dlclose in your C library is not built with
  exception unwinding, thrown exception cannot propagate
  back to main.


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
                   ` (4 preceding siblings ...)
  2003-08-19 15:15 ` lerdsuwa at gcc dot gnu dot org
@ 2003-08-19 15:32 ` peter dot rost at freenet dot de
  2003-08-24  9:42 ` lerdsuwa at users dot sourceforge dot net
                   ` (4 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: peter dot rost at freenet dot de @ 2003-08-19 15:32 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644



------- Additional Comments From peter dot rost at freenet dot de  2003-08-19 15:32 -------
Subject: Re:  Hang in throw when unloading a library

well, it sounds good, but

1. how can i determine if my dlclose is built with/without exception 
unwinding?
2. for me it's very mysterious, that the debian-compiled-version of gcc 2.95 
doesnot have any problems with but gcc 3.x has them!? so, are there some more 
changes at dlclose which can produce the behaviour?

thanks a lot for your help, peter.

On Tuesday 19 August 2003 17:15, you wrote:
> PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644
>
>
>
> ------- Additional Comments From lerdsuwa at gcc dot gnu dot org 
> 2003-08-19 15:15 ------- Two possible problems that make your code not
> working:
>
> 1 You need g++ and libstdc++ that are thread-enabled.
>   See this link for more info
>     http://gcc.gnu.org/bugs.html#nonbugs_cxx
>
> 2 The exception is thrown inside __fini_lib through the
>   function call chain:
>     main -> unloadLib -> dlclose -> __fini_Lib
>   If the dlclose in your C library is not built with
>   exception unwinding, thrown exception cannot propagate
>   back to main.
>
>
>
> ------- You are receiving this mail because: -------
> You reported the bug, or are watching the reporter.


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
                   ` (5 preceding siblings ...)
  2003-08-19 15:32 ` peter dot rost at freenet dot de
@ 2003-08-24  9:42 ` lerdsuwa at users dot sourceforge dot net
  2003-08-24 14:36 ` lerdsuwa at gcc dot gnu dot org
                   ` (3 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: lerdsuwa at users dot sourceforge dot net @ 2003-08-24  9:42 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644



------- Additional Comments From lerdsuwa at users dot sourceforge dot net  2003-08-24 09:42 -------
Subject: Re:  Hang in throw when unloading a library

You can use GCC option -fexceptions during compilation of
C code to make it support exception unwinding.  But after 
looking at the glibc dlcose  source code, I think throwing 
exception through this function could leave some glibc 
internal data structure messed up.  You should catch all 
exceptions in your library __fini_Lib instead.

--Kriang


Peter Rost wrote:

>well, it sounds good, but
>
>
>1. how can i determine if my dlclose is built with/without exception 
>unwinding?
>2. for me it's very mysterious, that the debian-compiled-version of gcc 2.95 
>doesnot have any problems with but gcc 3.x has them!? so, are there some more 
>changes at dlclose which can produce the behaviour?
>
>thanks a lot for your help, peter.
>
>  
>


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
                   ` (6 preceding siblings ...)
  2003-08-24  9:42 ` lerdsuwa at users dot sourceforge dot net
@ 2003-08-24 14:36 ` lerdsuwa at gcc dot gnu dot org
  2003-09-19 16:00 ` lerdsuwa at gcc dot gnu dot org
                   ` (2 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: lerdsuwa at gcc dot gnu dot org @ 2003-08-24 14:36 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644


lerdsuwa at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2003-08-24 14:36:22
               date|                            |


------- Additional Comments From lerdsuwa at gcc dot gnu dot org  2003-08-24 14:36 -------
We have a deadlock between glibc functions 'dlclose' and
'dl_iterate_phdr' both rely on the spinlock '_dl_load_lock'.  
And glibc doesn't have a recursive lock implementation yet.

This interferes with stack unwinding code in GCC.  When
compiled for glibc it currently uses 'dl_iterate_phdr' to
unwind the stack.  So user cannon throw exception anywhere 
inside library clean up function (called during 'dlclose').


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
                   ` (7 preceding siblings ...)
  2003-08-24 14:36 ` lerdsuwa at gcc dot gnu dot org
@ 2003-09-19 16:00 ` lerdsuwa at gcc dot gnu dot org
  2003-10-04 10:53 ` peter dot rost at freenet dot de
  2003-12-06  8:31 ` pinskia at gcc dot gnu dot org
  10 siblings, 0 replies; 12+ messages in thread
From: lerdsuwa at gcc dot gnu dot org @ 2003-09-19 16:00 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644



------- Additional Comments From lerdsuwa at gcc dot gnu dot org  2003-09-19 15:14 -------
I checked glibc 2.3.2 source code and it uses recursive locks now.
So this issue should be fixed with a glibc upgrade.  I am keeping
this around until someone with a new glibc installed can confirm 
and this bug report.


^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
                   ` (8 preceding siblings ...)
  2003-09-19 16:00 ` lerdsuwa at gcc dot gnu dot org
@ 2003-10-04 10:53 ` peter dot rost at freenet dot de
  2003-12-06  8:31 ` pinskia at gcc dot gnu dot org
  10 siblings, 0 replies; 12+ messages in thread
From: peter dot rost at freenet dot de @ 2003-10-04 10:53 UTC (permalink / raw)
  To: gcc-bugs

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644



------- Additional Comments From peter dot rost at freenet dot de  2003-10-04 10:53 -------
Subject: Re:  Hang in throw when unloading a library

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

hello, thanks for bug-fix;) but because i'm using debian linux i'm not
so aware of "how to install your fixed glibc-2.3.2"? can you probably
help me with a little bit assistance. thanks a lot, peter.

On Fri, 19 Sep 2003, lerdsuwa at gcc dot gnu dot org wrote:

> PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.
> 
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644
> 
> 
> 
> ------- Additional Comments From lerdsuwa at gcc dot gnu dot org  2003-09-19 15:14 -------
> I checked glibc 2.3.2 source code and it uses recursive locks now.
> So this issue should be fixed with a glibc upgrade.  I am keeping
> this around until someone with a new glibc installed can confirm 
> and this bug report.
> 
> 
> 
> ------- You are receiving this mail because: -------
> You reported the bug, or are watching the reporter.
> 
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Version: GnuPG v1.2.3 (GNU/Linux)

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OXH9jszwvoijtp2ISKguzEY=
=sOQz
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^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Bug c++/11644] Hang in throw when unloading a library
  2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
                   ` (9 preceding siblings ...)
  2003-10-04 10:53 ` peter dot rost at freenet dot de
@ 2003-12-06  8:31 ` pinskia at gcc dot gnu dot org
  10 siblings, 0 replies; 12+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-12-06  8:31 UTC (permalink / raw)
  To: gcc-bugs


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-12-06 08:31 -------
I know that for a fact Carlo Wood have a library that does dlclose that works (at least for non recent 
3.4 but that is a different bug and is already filed and is about to be fixed:) ).

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11644


^ permalink raw reply	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2003-12-06  8:31 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2003-07-23 12:12 [Bug c++/11644] New: Hang in throw when unloading a library peter dot rost at freenet dot de
2003-07-23 12:17 ` [Bug c++/11644] " peter dot rost at freenet dot de
2003-07-23 18:45 ` pinskia at physics dot uc dot edu
2003-07-23 19:24 ` peter dot rost at freenet dot de
2003-08-11 12:42 ` pinskia at gcc dot gnu dot org
2003-08-19 15:15 ` lerdsuwa at gcc dot gnu dot org
2003-08-19 15:32 ` peter dot rost at freenet dot de
2003-08-24  9:42 ` lerdsuwa at users dot sourceforge dot net
2003-08-24 14:36 ` lerdsuwa at gcc dot gnu dot org
2003-09-19 16:00 ` lerdsuwa at gcc dot gnu dot org
2003-10-04 10:53 ` peter dot rost at freenet dot de
2003-12-06  8:31 ` pinskia at gcc dot gnu dot org

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