[Bug target/36568] New: infinite _Unwind_Backtrace / thread stack unwinding.

[Bug target/36568] New: infinite _Unwind_Backtrace / thread stack unwinding.

[pluto at agmk dot net]

test w/o threads:

$ ./u
0x400a74 handler+0x1a
0x400a95 crash+0x10
0x400afd main+0x60
0x7fa92f9e74a4 __libc_start_main+0xf4

test w/ threads:

$ ./u threaded
0x400a74 handler+0x1a
0x400a95 crash+0x10
0x7fcea7803a3d clone+0x6d
0x7fcea7803a3d clone+0x6d
0x7fcea7803a3d clone+0x6d
0x7fcea7803a3d clone+0x6d
0x7fcea7803a3d clone+0x6d
0x7fcea7803a3d clone+0x6d
0x7fcea7803a3d clone+0x6d
0x7fcea7803a3d clone+0x6d
0x7fcea7803a3d clone+0x6d
(...)

gdb stops unwinding at clone():

$ gdb ./u
(gdb) set args threaded
(gdb) r
(...)
[New Thread 0x7fdd9636b6f0 (LWP 7318)]
[New Thread 0x42501950 (LWP 7322)]
(...)
Breakpoint 2, handler (signalNumber=11) at u.c:25
25              _Unwind_Backtrace( helper, 0 );
(gdb) bt
#0  handler (signalNumber=11) at u.c:25
#1  <signal handler called>
#2  0x0000000000400a95 in crash () at u.c:32
#3  0x00007fa0eef04070 in start_thread () from /lib64/libpthread.so.0
#4  0x00007fa0eea6da3d in clone () from /lib64/libc.so.6

gcc-4.2.4-1.x86_64
glibc-2.8-3.x86_64
gdb-6.8-1.x86_64


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           Summary: infinite _Unwind_Backtrace / thread stack unwinding.
           Product: gcc
           Version: 4.2.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pluto at agmk dot net
GCC target triplet: x86_64-gnu-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36568

[Bug target/36568] infinite _Unwind_Backtrace / thread stack unwinding.

[pluto at agmk dot net]

------- Comment #1 from pluto at agmk dot net  2008-06-18 19:35 -------
Created an attachment (id=15781)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15781&action=view)
testcase.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36568

[Bug target/36568] infinite _Unwind_Backtrace / thread stack unwinding.

[pluto at agmk dot net]

------- Comment #2 from pluto at agmk dot net  2008-06-18 19:36 -------
Created an attachment (id=15782)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15782&action=view)
testcase makefile.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36568

[Bug target/36568] infinite _Unwind_Backtrace / thread stack unwinding.

[vinutheraj at gmail dot com]

------- Comment #3 from vinutheraj at gmail dot com  2008-06-24 21:04 -------
Created an attachment (id=15812)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15812&action=view)
A patch which comes with debian and ubuntu which solves this problem

A patch which is provided with ubuntu and debian which solves the 
problem of the infinite _Unwind_Backtrace automagically. I chanced upon this
luckily. In ubuntu do apt-get install glibc-source and in patches/amd64/ 
you will find it.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36568

[Bug target/36568] infinite _Unwind_Backtrace / thread stack unwinding.

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2008-06-24 22:03 -------
This is a glibc bug then.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36568

[Bug target/36568] infinite _Unwind_Backtrace / thread stack unwinding.

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2008-06-24 22:02 -------
*** Bug 36621 has been marked as a duplicate of this bug. ***


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vinutheraj at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36568

[Bug target/36568] infinite _Unwind_Backtrace / thread stack unwinding.

[pluto at agmk dot net]

------- Comment #6 from pluto at agmk dot net  2008-06-25 07:52 -------
forwarded to libc bugzilla:
http://sources.redhat.com/bugzilla/show_bug.cgi?id=6693


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36568

[Bug target/36568] infinite _Unwind_Backtrace / thread stack unwinding.

[pluto at agmk dot net]

------- Comment #7 from pluto at agmk dot net  2008-10-28 15:18 -------
(In reply to comment #5)
> This is a glibc bug then.
> 

hmm, Ulrich Drepper rejects this bug report.
http://sources.redhat.com/bugzilla/show_bug.cgi?id=6693#c1


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36568