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List:       gdb-bugs
Subject:    restarting a program linked with "-lpthread" fails
From:       Markus Grabner <grabner () icg ! tu-graz ! ac ! at>
Date:       2001-03-01 20:52:04
Message-ID: 3A9EB674.A1CAEE2C () icg ! tu-graz ! ac ! at
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System information:
       distribution: SuSE Linux 7.1
       GDB version: 5.0
       OS version: Linux 2.2.18-SMP i686
       computer: dual Pentium III
       compiler used to compile test program: g++ 2.95.2
       compiler used to compile GDB: don't know, probably g++ 2.95.2
		since it is packaged with SuSE Linux 7.1
       glibc-2.2

The following file "gdb_bug.c++" is used to demonstrate the problem:
-------------------
int
main()
{
  return 0;
}
-------------------

The program linked with -lpthread can't be restarted in GDB. See the following
example: first the program is compiled (line 1), the debugger is invoked (line
2), and the program is run twice (lines 10 and 14) without problems. Then the
program is compiled again with "-lpthread" (line 19), and the debugger is
invoked (line 20). Starting it the first time works fine (line 28), but the
second attempt (line 33) gives an error message (lines 35/36).

     1	mark:~/prgs/test$ g++ -g gdb_bug.c++
     2	mark:~/prgs/test$ gdb a.out
     3	GNU gdb 5.0
     4	Copyright 2000 Free Software Foundation, Inc.
     5	GDB is free software, covered by the GNU General Public License, and you are
     6	welcome to change it and/or distribute copies of it under certain conditions.
     7	Type "show copying" to see the conditions.
     8	There is absolutely no warranty for GDB.  Type "show warranty" for details.
     9	This GDB was configured as "i386-suse-linux"...
    10	(gdb) r
    11	Starting program: /home/mgrabner/prgs/test/a.out
    12	
    13	Program exited normally.
    14	(gdb) r
    15	Starting program: /home/mgrabner/prgs/test/a.out
    16	 
    17	Program exited normally.
    18	(gdb) quit
    19	mark:~/prgs/test$ g++ -g gdb_bug.c++ -lpthread
    20	mark:~/prgs/test$ gdb a.out
    21	GNU gdb 5.0
    22	Copyright 2000 Free Software Foundation, Inc.
    23	GDB is free software, covered by the GNU General Public License, and you are
    24	welcome to change it and/or distribute copies of it under certain conditions.
    25	Type "show copying" to see the conditions.
    26	There is absolutely no warranty for GDB.  Type "show warranty" for details.
    27	This GDB was configured as "i386-suse-linux"...
    28	(gdb) r
    29	Starting program: /home/mgrabner/prgs/test/a.out
    30	[New Thread 1024 (LWP 9884)]
    31	 
    32	Program exited normally.
    33	(gdb) r
    34	Starting program: /home/mgrabner/prgs/test/a.out
    35	warning: Cannot insert breakpoint -6:
    36	Cannot access memory at address 0x40037600
    37	(gdb)

-- 
Markus Grabner - Computer Graphics and Vision
Graz University of Technology, Inffeldgasse 16/II, 8010 Graz, Austria
Phone: +43/316/873-5041, Fax: +43/316/873-5050
Email: grabner@icg.tu-graz.ac.at, WWW: http://www.icg.tu-graz.ac.at/~grabner


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