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* [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca)
@ 2009-07-29 5:38 zecke at selfish dot org
2009-07-29 5:41 ` [Bug symtab/10457] " zecke at selfish dot org
` (8 more replies)
0 siblings, 9 replies; 10+ messages in thread
From: zecke at selfish dot org @ 2009-07-29 5:38 UTC (permalink / raw)
To: gdb-prs
Debugging a process that loaded a debug enabled libWebKitQt will lead to a segfault in gdb. This
is due a stack overflow. valgrind reports the event the following way and a backtrace from a core
file is also in this description.
valgrind:
==11373== Process terminating with default action of signal 11 (SIGSEGV)
==11373== Access not within mapped region at address 0xBE26EFDC
==11373== at 0x827D2C2: cplus_demangle_type (in /usr/bin/gdb)
==11373== If you believe this happened as a result of a stack overflow in your
==11373== program's main thread (unlikely but possible), you can try to increase
==11373== the size of the main thread stack using the --main-stacksize= flag.
==11373== The main thread stack size used in this run was 8388608.
==11373== Stack overflow in thread 1: can't grow stack to 0xbe26efd8
gdb on the core:
Core was generated by `gdb --args ./bin/QtLauncher http://index.hu'.
Program terminated with signal 11, Segmentation fault.
#0 0x0827e538 in ?? ()
(gdb) bt
#0 0x0827e538 in ?? ()
#1 0x0827d2c7 in cplus_demangle_type ()
#2 0x0827d39e in cplus_demangle_type ()
#3 0x0827df55 in ?? ()
#4 0x0827e6b5 in ?? ()
#5 0x0827e76c in ?? ()
#6 0x08280b2b in ?? ()
#7 0x08280c95 in ?? ()
#8 0x08280d04 in cplus_demangle_v3 ()
#9 0x08279e03 in cplus_demangle ()
#10 0x08139fc4 in symbol_set_names ()
#11 0x0808dc80 in prim_record_minimal_symbol_and_info ()
#12 0x080fce83 in ?? ()
#13 0x080fd0ce in ?? ()
#14 0x080fda39 in ?? ()
#15 0x0813dcf0 in syms_from_objfile ()
#16 0x0813f383 in ?? ()
#17 0x080a879e in solib_read_symbols ()
#18 0x080a8dcc in solib_add ()
#19 0x08152341 in handle_inferior_event ()
#20 0x08154760 in wait_for_inferior ()
#21 0x08154b2c in proceed ()
#22 0x0814c157 in ?? ()
#23 0x08090ea2 in execute_command ()
#24 0x08161a9b in ?? ()
#25 0x081627ea in ?? ()
#26 0xb7ec1277 in rl_callback_read_char () from /lib/libreadline.so.5
#27 0x08161bdb in ?? ()
#28 0x081610b9 in ?? ()
#29 0x081608db in ?? ()
#30 0x08161796 in gdb_do_one_event ()
#31 0x0815baa3 in catch_errors ()
#32 0x080ee2d4 in ?? ()
#33 0x0815c173 in current_interp_command_loop ()
#34 0x0808890b in ?? ()
#35 0x0815baa3 in catch_errors ()
#36 0x080894a4 in ?? ()
#37 0x0815baa3 in catch_errors ()
#38 0x08088832 in gdb_main ()
#39 0x080887f3 in main ()
(gdb)
--
Summary: gdb Segfaults due stack overflow (excessive usage of
alloca)
Product: gdb
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: symtab
AssignedTo: unassigned at sourceware dot org
ReportedBy: zecke at selfish dot org
CC: gdb-prs at sourceware dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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* [Bug symtab/10457] gdb Segfaults due stack overflow (excessive usage of alloca)
2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
@ 2009-07-29 5:41 ` zecke at selfish dot org
2009-07-29 23:01 ` ppluzhnikov at google dot com
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: zecke at selfish dot org @ 2009-07-29 5:41 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From zecke at selfish dot org 2009-07-29 05:41 -------
Created an attachment (id=4095)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=4095&action=view)
Hack to change alloca to malloc
The following workaround is working for me. The idea is to exchange alloca with
malloc.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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* [Bug symtab/10457] gdb Segfaults due stack overflow (excessive usage of alloca)
2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
2009-07-29 5:41 ` [Bug symtab/10457] " zecke at selfish dot org
@ 2009-07-29 23:01 ` ppluzhnikov at google dot com
2009-08-11 14:44 ` zecke at selfish dot org
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: ppluzhnikov at google dot com @ 2009-07-29 23:01 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From ppluzhnikov at google dot com 2009-07-29 23:01 -------
A related patch for the same problem (but in different area of GDB):
http://sourceware.org/ml/gdb-patches/2009-07/msg00598.html
Holger, could you send me (or otherwise make available) the bin/QtLauncher
binary which makes GDB crash?
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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* [Bug symtab/10457] gdb Segfaults due stack overflow (excessive usage of alloca)
2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
2009-07-29 5:41 ` [Bug symtab/10457] " zecke at selfish dot org
2009-07-29 23:01 ` ppluzhnikov at google dot com
@ 2009-08-11 14:44 ` zecke at selfish dot org
2009-08-14 12:54 ` ppluzhnikov at google dot com
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: zecke at selfish dot org @ 2009-08-11 14:44 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From zecke at selfish dot org 2009-08-11 14:44 -------
(In reply to comment #2)
> A related patch for the same problem (but in different area of GDB):
> http://sourceware.org/ml/gdb-patches/2009-07/msg00598.html
>
> Holger, could you send me (or otherwise make available) the bin/QtLauncher
> binary which makes GDB crash?
The binary + WebKit library is +100mb of size. Where should I send it or upload it?
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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* [Bug symtab/10457] gdb Segfaults due stack overflow (excessive usage of alloca)
2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
` (2 preceding siblings ...)
2009-08-11 14:44 ` zecke at selfish dot org
@ 2009-08-14 12:54 ` ppluzhnikov at google dot com
2009-10-01 6:31 ` zecke at selfish dot org
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: ppluzhnikov at google dot com @ 2009-08-14 12:54 UTC (permalink / raw)
To: gdb-prs
--
What |Removed |Added
----------------------------------------------------------------------------
CC| |ppluzhnikov at google dot
| |com
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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* [Bug symtab/10457] gdb Segfaults due stack overflow (excessive usage of alloca)
2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
` (3 preceding siblings ...)
2009-08-14 12:54 ` ppluzhnikov at google dot com
@ 2009-10-01 6:31 ` zecke at selfish dot org
2009-10-08 5:30 ` ppluzhnikov at google dot com
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: zecke at selfish dot org @ 2009-10-01 6:31 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From zecke at selfish dot org 2009-10-01 06:31 -------
Sorry for delaying it, I will try to compile and provide the necessary libraries
by next week.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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* [Bug symtab/10457] gdb Segfaults due stack overflow (excessive usage of alloca)
2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
` (4 preceding siblings ...)
2009-10-01 6:31 ` zecke at selfish dot org
@ 2009-10-08 5:30 ` ppluzhnikov at google dot com
2009-10-08 16:38 ` cvs-commit at gcc dot gnu dot org
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: ppluzhnikov at google dot com @ 2009-10-08 5:30 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From ppluzhnikov at google dot com 2009-10-08 05:30 -------
Following Holger's directions and additional directions here:
http://trac.webkit.org/wiki/BuildingQtOnLinux#DependenciesforspecificLinuxdistributions
I built debug version of Webkit with:
WebKitTools/Scripts/build-webkit --qt --debug
on Fedora 11/i686 and tested it with GDB from CVS Head, which did not crash with
(default) 'ulimit -s' of 10240
The resulting libQtWebKit.so.4.5.2 is 472223763 bytes.
It does crash with 6M stack though.
The problem is alloca in elf_symtab_read in a loop.
Patch sent:
http://sourceware.org/ml/gdb-patches/2009-10/msg00163.html
With the patch, GDB runs in 16K stack (ulimit -s 16) on this test case without
any problems.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at sourceware dot|ppluzhnikov at google dot
|org |com
Status|WAITING |ASSIGNED
Ever Confirmed| |1
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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* [Bug symtab/10457] gdb Segfaults due stack overflow (excessive usage of alloca)
2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
` (5 preceding siblings ...)
2009-10-08 5:30 ` ppluzhnikov at google dot com
@ 2009-10-08 16:38 ` cvs-commit at gcc dot gnu dot org
2009-10-08 16:41 ` ppluzhnikov at google dot com
2009-10-08 17:42 ` cvs-commit at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2009-10-08 16:38 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2009-10-08 16:38 -------
Subject: Bug 10457
CVSROOT: /cvs/src
Module name: src
Changes by: ppluzhnikov@sourceware.org 2009-10-08 16:38:42
Modified files:
gdb : ChangeLog elfread.c
Log message:
2009-10-08 Paul Pluzhnikov <ppluzhnikov@google.com>
PR gdb/10457
* elfread.c (elf_symtab_read): Don't use alloca in a loop.
Patches:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.10941&r2=1.10942
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/elfread.c.diff?cvsroot=src&r1=1.77&r2=1.78
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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* [Bug symtab/10457] gdb Segfaults due stack overflow (excessive usage of alloca)
2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
` (6 preceding siblings ...)
2009-10-08 16:38 ` cvs-commit at gcc dot gnu dot org
@ 2009-10-08 16:41 ` ppluzhnikov at google dot com
2009-10-08 17:42 ` cvs-commit at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: ppluzhnikov at google dot com @ 2009-10-08 16:41 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From ppluzhnikov at google dot com 2009-10-08 16:41 -------
Fixed on trunk.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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* [Bug symtab/10457] gdb Segfaults due stack overflow (excessive usage of alloca)
2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
` (7 preceding siblings ...)
2009-10-08 16:41 ` ppluzhnikov at google dot com
@ 2009-10-08 17:42 ` cvs-commit at gcc dot gnu dot org
8 siblings, 0 replies; 10+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2009-10-08 17:42 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2009-10-08 17:42 -------
Subject: Bug 10457
CVSROOT: /cvs/src
Module name: src
Branch: gdb_7_0-branch
Changes by: ppluzhnikov@sourceware.org 2009-10-08 17:42:10
Modified files:
gdb : ChangeLog elfread.c
Log message:
2009-10-08 Paul Pluzhnikov <ppluzhnikov@google.com>
PR gdb/10457
* elfread.c (elf_symtab_read): Don't use alloca in a loop.
Patches:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&only_with_tag=gdb_7_0-branch&r1=1.10874.2.48&r2=1.10874.2.49
http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/gdb/elfread.c.diff?cvsroot=src&only_with_tag=gdb_7_0-branch&r1=1.77&r2=1.77.4.1
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10457
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2009-07-29 5:38 [Bug symtab/10457] New: gdb Segfaults due stack overflow (excessive usage of alloca) zecke at selfish dot org
2009-07-29 5:41 ` [Bug symtab/10457] " zecke at selfish dot org
2009-07-29 23:01 ` ppluzhnikov at google dot com
2009-08-11 14:44 ` zecke at selfish dot org
2009-08-14 12:54 ` ppluzhnikov at google dot com
2009-10-01 6:31 ` zecke at selfish dot org
2009-10-08 5:30 ` ppluzhnikov at google dot com
2009-10-08 16:38 ` cvs-commit at gcc dot gnu dot org
2009-10-08 16:41 ` ppluzhnikov at google dot com
2009-10-08 17:42 ` cvs-commit at gcc dot gnu dot org
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