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* [Bug c++/11572] New: Segmentation fault in name demangler on 64-bit
@ 2010-05-05 20:37 jameslyon0 at googlemail dot com
2010-05-05 20:38 ` [Bug c++/11572] " jameslyon0 at googlemail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: jameslyon0 at googlemail dot com @ 2010-05-05 20:37 UTC (permalink / raw)
To: gdb-prs
I get a segmentation fault when trying to load my program. The crash happens in
the function d_find_pack during demangling. The name which ultimately causes
this error is:
_ZN3Psi7VariantIIcPKcEE5visitIIRZN11VariantTest9TestVisit11test_methodEvEUlS2_E0_RZNS6_11test_methodEvEUlcE1_RZNS6_11test_methodEvEUlNS_4NoneEE_EEENS_13VariantDetail19SelectVisitorResultIIDpT_EE4typeEDpOSG_
I'll attach a GDB session tracking the error. This appears to be related to
64-bit, since the s_unary_num.num field is set to zero in this instance which on
a 32-bit system would cause the s_binary.right field to be NULL, but that does
not happen here. In any case I don't think the s_binary member should be
accessed since the type is DEMANGLE_COMPONENT_LAMBDA, so I've fixed it by adding
a case to d_find_pack to check for it:
@@ -3467,7 +3467,8 @@
case DEMANGLE_COMPONENT_PACK_EXPANSION:
return NULL;
+ case DEMANGLE_COMPONENT_LAMBDA:
case DEMANGLE_COMPONENT_NAME:
case DEMANGLE_COMPONENT_OPERATOR:
case DEMANGLE_COMPONENT_BUILTIN_TYPE:
I don't know if this is really the right place to fix it though.
--
Summary: Segmentation fault in name demangler on 64-bit
Product: gdb
Version: 7.1
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at sourceware dot org
ReportedBy: jameslyon0 at googlemail dot com
CC: gdb-prs at sourceware dot org
GCC host triplet: Ubuntu 10.04
http://sourceware.org/bugzilla/show_bug.cgi?id=11572
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* [Bug c++/11572] Segmentation fault in name demangler on 64-bit
2010-05-05 20:37 [Bug c++/11572] New: Segmentation fault in name demangler on 64-bit jameslyon0 at googlemail dot com
@ 2010-05-05 20:38 ` jameslyon0 at googlemail dot com
2010-05-12 20:26 ` tromey at redhat dot com
2010-09-10 22:42 ` tromey at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: jameslyon0 at googlemail dot com @ 2010-05-05 20:38 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From jameslyon0 at googlemail dot com 2010-05-05 20:38 -------
Created an attachment (id=4770)
--> (http://sourceware.org/bugzilla/attachment.cgi?id=4770&action=view)
GDB session with backtrace and dumps of relevant data structures
--
http://sourceware.org/bugzilla/show_bug.cgi?id=11572
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* [Bug c++/11572] Segmentation fault in name demangler on 64-bit
2010-05-05 20:37 [Bug c++/11572] New: Segmentation fault in name demangler on 64-bit jameslyon0 at googlemail dot com
2010-05-05 20:38 ` [Bug c++/11572] " jameslyon0 at googlemail dot com
@ 2010-05-12 20:26 ` tromey at redhat dot com
2010-09-10 22:42 ` tromey at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: tromey at redhat dot com @ 2010-05-12 20:26 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From tromey at redhat dot com 2010-05-12 20:26 -------
The best way to get a review of this patch is to submit it to GCC,
where this code is canonically maintained.
Also you might consider adding a regression test to the demangler test suite.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=11572
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* [Bug c++/11572] Segmentation fault in name demangler on 64-bit
2010-05-05 20:37 [Bug c++/11572] New: Segmentation fault in name demangler on 64-bit jameslyon0 at googlemail dot com
2010-05-05 20:38 ` [Bug c++/11572] " jameslyon0 at googlemail dot com
2010-05-12 20:26 ` tromey at redhat dot com
@ 2010-09-10 22:42 ` tromey at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: tromey at redhat dot com @ 2010-09-10 22:42 UTC (permalink / raw)
To: gdb-prs
------- Additional Comments From tromey at redhat dot com 2010-09-10 22:42 -------
I checked in the fix and test case.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |FIXED
Target Milestone|7.1 |7.3
http://sourceware.org/bugzilla/show_bug.cgi?id=11572
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end of thread, other threads:[~2010-09-10 22:42 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2010-05-05 20:37 [Bug c++/11572] New: Segmentation fault in name demangler on 64-bit jameslyon0 at googlemail dot com
2010-05-05 20:38 ` [Bug c++/11572] " jameslyon0 at googlemail dot com
2010-05-12 20:26 ` tromey at redhat dot com
2010-09-10 22:42 ` tromey at redhat dot com
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