From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28966 invoked by alias); 7 Jul 2004 14:47:14 -0000 Mailing-List: contact gdb-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sources.redhat.com Received: (qmail 28809 invoked from network); 7 Jul 2004 14:47:11 -0000 Received: from unknown (HELO e33.co.us.ibm.com) (32.97.110.131) by sourceware.org with SMTP; 7 Jul 2004 14:47:11 -0000 Received: from westrelay02.boulder.ibm.com (westrelay02.boulder.ibm.com [9.17.195.11]) by e33.co.us.ibm.com (8.12.10/8.12.2) with ESMTP id i67ElAZK555336 for ; Wed, 7 Jul 2004 10:47:10 -0400 Received: from austin.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by westrelay02.boulder.ibm.com (8.12.10/NCO/VER6.6) with ESMTP id i67El6GV392130 for ; Wed, 7 Jul 2004 08:47:09 -0600 Received: from lazy.austin.ibm.com (lazy.austin.ibm.com [9.53.94.97]) by austin.ibm.com (8.12.10/8.12.10) with ESMTP id i67El5Kw042530 for ; Wed, 7 Jul 2004 09:47:05 -0500 Date: Wed, 07 Jul 2004 14:47:00 -0000 From: Manoj Iyer X-X-Sender: manjo@lazy To: gdb@sources.redhat.com Subject: Re: GDB mainline segfaults on 32bit threaded program. In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="8323328-1236916678-1089210171=:28971" X-SW-Source: 2004-07/txt/msg00054.txt.bz2 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. Send mail to mime@docserver.cac.washington.edu for more info. --8323328-1236916678-1089210171=:28971 Content-Type: TEXT/PLAIN; charset=US-ASCII Content-length: 2367 Sorry forgot to attach the testcase. -- Manjo On Tue, 6 Jul 2004, Manoj Iyer wrote: > > GDB (mainline cvs) built 32bit on ppc64 machine running sles9 dumps core > on a multithreaded program. gdb segfaults only when I set a breakpoint on > the thread fucntion and decide to stop there. > > 1. cc -o tbug_dwarf2 tbug.c -g dwarf-2 -lpthread > 2. gdb tbug_dwarf2 > 3. br main > 4. br tf > 5. run <---- segfalts here > 6. c > > > Attached is a testcase that can re-create this problem "tbug.c" > > I used GDB to debug this core produced, here is the backtrace... > #0 0x0fe05694 in strcmp () from /lib/tls/libc.so.6 > #1 0x100cfba8 in lookup_symtab (name=0xffffc360 "/root/manjo/tbug.c") > at symtab.c:185 > #2 0x100d9254 in symtab_from_filename (argptr=0xffffc480, p=0x104caafa > ":tf", > is_quote_enclosed=0, not_found_ptr=0x0) at linespec.c:1523 > #3 0x100d99c4 in decode_line_1 (argptr=0xffffc480, funfirstline=1, > default_symtab=0x0, default_line=0, canonical=0x0, not_found_ptr=0x0) > at linespec.c:744 > #4 0x100a432c in breakpoint_re_set_one (bint=0x104ca958) at > breakpoint.c:7157 > #5 0x10051748 in do_catch_errors (uiout=0x104ca958, data=0x0) at > top.c:524 > #6 0x10053d20 in catcher (func=0x1005172c , > func_uiout=0x104712c8, func_args=0xffffc848, func_val=0xffffc850, > func_caught=0xffffc854, > errstring=0x7f7f7f7f
, > gdberrmsg=0x0, > mask=6) at top.c:431 > #7 0x10053d80 in catch_errors (func=0xffffc2f0, func_args=0x104cbeb8, > errstring=0x7f7f7f7f
, mask=0) > at top.c:536 > #8 0x100a2b14 in breakpoint_re_set () at breakpoint.c:7340 > #9 0x100d2bd4 in new_symfile_objfile (objfile=0x104ca958, mainline=0, > verbo=0) > at symfile.c:741 > #10 0x100d4634 in symbol_file_add_with_addrs_or_offsets (abfd=0x104d0220, > from_tty=0, addrs=0x0, offsets=0x0, num_offsets=0, mainline=0, > flags=8) > > > The macro FILENAME_CMP in symtab.c:185 uses the strcmp to do the > comparison, symtab_to_fullname() function returns NULL for s->fullname and > this causes strcmp to segfault. Although syntab.c:185 checks if full_path > != NULL but it does not check if const char *fp = symtab_to_fullname (s); > is not equal to NULL. I dont know what causes symtab_to_fullname() to > return NULL. > > Thanks > Manoj Iyer > --8323328-1236916678-1089210171=:28971 Content-Type: TEXT/x-csrc; charset=US-ASCII; name="tbug.c" Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: TEST CASE Content-Disposition: attachment; filename="tbug.c" Content-length: 1184 I2luY2x1ZGUgPHN0cmluZy5oPg0KI2luY2x1ZGUgPHVuaXN0ZC5oPg0KI2lu Y2x1ZGUgPHB0aHJlYWQuaD4NCiNpbmNsdWRlIDxzdGRsaWIuaD4NCiNpbmNs dWRlIDxzdGRpby5oPg0KI2luY2x1ZGUgPGVycm5vLmg+DQoNCiNkZWZpbmUg TiAgICAgICAyDQoNCnN0YXRpYyB2b2lkICoNCnRmICh2b2lkICphcmcpDQp7 DQogIGludCBuID0gKGludCkgKGxvbmcgaW50KSBhcmc7DQogIGNoYXIgbnVt YmVyWzE2MF07DQogIHNwcmludGYobnVtYmVyLCAidGYoJWxkKTogYmVnaW4i LCAobG9uZylhcmcpOw0KICBwdXRzIChudW1iZXIpOw0KDQogc2xlZXAgKDEw KTsNCiAgc3ByaW50ZihudW1iZXIsICJ0ZiglbGQpOiBlbmQiLCAobG9uZylh cmcpOw0KICBwdXRzIChudW1iZXIpOw0KICByZXR1cm4gTlVMTDsNCn0NCg0K aW50IG1haW4gKGludCBhcmdjLCBjaGFyICphcmd2W10pDQp7DQogIGludCBu Ow0KICBwdGhyZWFkX3QgdGhbTl07DQoNCiAgZm9yIChuID0gMDsgbiA8IE47 ICsrbikNCiAgICBpZiAocHRocmVhZF9jcmVhdGUgKCZ0aFtuXSwgTlVMTCwg dGYsICh2b2lkICopIChsb25nIGludCkgbikgIT0gMCkNCiAgICAgIHsNCiAg ICAgICAgc2xlZXAoMik7DQogICAgICAgIHB1dHMgKCJjcmVhdGUgZmFpbGVk Iik7DQogICAgICAgIGV4aXQgKDEpOw0KICAgICAgfQ0KDQogIHB1dHMoImFm dGVyIGNyZWF0ZSIpOw0KDQogIGZvciAobiA9IDA7IG4gPCBOOyArK24pDQog ICAgaWYgKHB0aHJlYWRfam9pbiAodGhbbl0sIE5VTEwpICE9IDApDQogICAg ICB7DQogICAgICAgIHB1dHMgKCJqb2luIGZhaWxlZCIpOw0KICAgICAgICBl eGl0ICgxKTsNCiAgICAgIH0NCg0KDQogIHB1dHMoImFmdGVyIGpvaW4iKTsN CiAgcmV0dXJuIDA7DQp9DQo= --8323328-1236916678-1089210171=:28971--