symtab/2005: info line seems to crash in gdb 6.3

Sven Krueger sk1@delair.de
Sat Sep 17 20:08:00 GMT 2005


The following reply was made to PR symtab/2005; it has been noted by GNATS.

From: Sven Krueger <sk1@delair.de>
To: gdb-gnats@sources.redhat.com, nobody@sources.redhat.com,
	sk1@delair.de
Cc: Daniel Jacobowitz <drow@false.org>
Subject: Re: symtab/2005: info line seems to crash in gdb 6.3
Date: Thu, 8 Sep 2005 07:40:32 +0200

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 > > if I start a gdb in another gdb and use this one for debugging the simp=
 le=20
 > > Hello World program I get the following backtrace:
 =20
 > Could you try this with valgrind?  It definitely doesn't happen to me.
 
 (...)
 
 > Failing that, please attach a small binary which shows the problem.
 
 Of course. I've attached the valgrind dump and the binary to this mail.
 By the way: Thank you very much for your great work on gdb and for your=20
 support!!
 
 =2D-=20
 
  Sven Kr=FCger
  delair ATS GmbH
 
 
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 elsa 8$ valgrind gdb
 ==3698== Memcheck, a memory error detector for x86-linux.
 ==3698== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al.
 ==3698== Using valgrind-2.4.0, a program supervision framework for x86-linux.
 ==3698== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et al.
 ==3698== For more details, rerun with: -v
 ==3698==
 GNU gdb Red Hat Linux (6.3.0.0-1.21rh)
 Copyright 2004 Free Software Foundation, Inc.
 GDB is free software, covered by the GNU General Public License, and you are
 welcome to change it and/or distribute copies of it under certain conditions.
 Type "show copying" to see the conditions.
 There is absolutely no warranty for GDB.  Type "show warranty" for details.
 This GDB was configured as "i386-redhat-linux-gnu".
 (gdb) file hw1
 Reading symbols from /usr/home/krueger/test/gdb/hw1...done.
 Using host libthread_db library "/lib/libthread_db.so.1".
 (gdb) run
 Starting program: /usr/home/krueger/test/gdb/hw1
 ==3700==
 ==3700== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 22 from 1)
 ==3700== malloc/free: in use at exit: 358656 bytes in 2321 blocks.
 ==3700== malloc/free: 2849 allocs, 528 frees, 457887 bytes allocated.
 ==3700== For counts of detected errors, rerun with: -v
 ==3700== searching for pointers to 2321 not-freed blocks.
 ==3700== checked 618516 bytes.
 ==3700==
 ==3700== LEAK SUMMARY:
 ==3700==    definitely lost: 9975 bytes in 266 blocks.
 ==3700==      possibly lost: 0 bytes in 0 blocks.
 ==3700==    still reachable: 348681 bytes in 2055 blocks.
 ==3700==         suppressed: 0 bytes in 0 blocks.
 ==3700== Use --leak-check=full to see details of leaked memory.
 Reading symbols from shared object read from target memory...done.
 Loaded system supplied DSO at 0x111000
 Hello world
 
 Program received signal SIGINT, Interrupt.
 0x00111402 in __kernel_vsyscall ()
 (gdb) info line main
 ==3698== Conditional jump or move depends on uninitialised value(s)
 ==3698==    at 0x8086502: xfree (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x80F4CA0: find_line_pc_range (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x80DF3A3: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8084DA1: execute_command (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8112C93: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8113108: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x81EDE7C: rl_callback_read_char (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x81125BA: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8111E6D: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8111951: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8112196: gdb_do_one_event (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8084833: (within /.nfsroot/usr/bin/gdb)
 ==3698==
 ==3698== Conditional jump or move depends on uninitialised value(s)
 ==3698==    at 0x1B9096F8: free (vg_replace_malloc.c:152)
 ==3698==    by 0x80F4CA0: find_line_pc_range (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x80DF3A3: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8084DA1: execute_command (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8112C93: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8113108: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x81EDE7C: rl_callback_read_char (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x81125BA: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8111E6D: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8111951: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8112196: gdb_do_one_event (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8084833: (within /.nfsroot/usr/bin/gdb)
 ==3698==
 ==3698== Invalid free() / delete / delete[]
 ==3698==    at 0x1B909743: free (vg_replace_malloc.c:152)
 ==3698==    by 0x80F4CA0: find_line_pc_range (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x80DF3A3: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8084DA1: execute_command (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8112C93: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8113108: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x81EDE7C: rl_callback_read_char (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x81125BA: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8111E6D: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8111951: (within /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8112196: gdb_do_one_event (in /.nfsroot/usr/bin/gdb)
 ==3698==    by 0x8084833: (within /.nfsroot/usr/bin/gdb)
 ==3698==  Address 0x1 is not stack'd, malloc'd or (recently) free'd
 Line 5 of "hw.c" starts at address 0x8048464 <main>
    and ends at 0x8048480 <main+28>.
 
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