The following test case triggers: ../../src/gdb/breakpoint.c:7445: internal-error: expand_line_sal_maybe: Assertion `found' failed. A problem internal to GDB has been detected, further debugging may prove unreliable. Aborted (core dumped) at current HEAD (7.2.50.20110311-cvs) when setting a breakpoint on Bar::Bar. As far as I can tell, this is happening because skip_prologue_sal() returns a "bad" sal when it detects inlined function. If I make skip_prologue_sal into a no-op, then the breakpoint is set properly, and there is no crash. This could be a duplicate of Bug 11031, but I have a test case to reproduce this with: /// --- cut --- foo.cc --- #include <stdlib.h> struct Foo { Foo(int) __attribute__((always_inline)); int x; }; struct Bar { Bar(int) __attribute__((noinline)); Foo f; int x; }; Bar::Bar(int i) : f(i), x(i) { } Foo::Foo(int i) : x(i) { free(malloc(1)); } int main() { Bar b(42); return b.x + b.f.x; } /// --- cut --- foo.cc --- Build with: g++ -g -O2 foo.cc -fno-omit-frame-pointer (note: frame pointer is important to repro the problem!) gdb -ex 'break Bar::Bar' a.out GNU gdb (GDB) 7.2.50.20110311-cvs Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-unknown-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /tmp/a.out...done. ../../src/gdb/breakpoint.c:7445: internal-error: expand_line_sal_maybe: Assertion `found' failed. A problem internal to GDB has been detected, further debugging may prove unreliable. Aborted (core dumped) The problem reproduces with gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5), but not with GCC 4.6.0 20110219 (experimental). I am attach the binary in case your copy of GCC produces something that does not trigger the problem.
Created attachment 5297 [details] compressed binary which triggers the problem
Apparently this has already been reported and a patch proposed: http://sourceware.org/ml/gdb-patches/2010-07/msg00533.html https://bugzilla.redhat.com/show_bug.cgi?id=612253
[rfc, 7.3?] -O2 -g breakpoints internal error + prologue skipping http://sourceware.org/ml/gdb-patches/2011-04/msg00229.html
CVSROOT: /cvs/src Module name: src Changes by: jkratoch@sourceware.org 2011-05-06 15:06:49 Modified files: gdb : ChangeLog dwarf2read.c symtab.c symtab.h gdb/testsuite : ChangeLog Added files: gdb/testsuite/gdb.dwarf2: dw2-skip-prologue.S dw2-skip-prologue.c dw2-skip-prologue.exp Log message: gdb/ PR 12573 * dwarf2read.c (struct dwarf2_cu): New field has_loclist. (producer_is_gcc_ge_4_0): New function. (process_full_comp_unit): Set also symtab->locations_valid. Move the symtab->language code. (var_decode_location): Set cu->has_loclist. * symtab.c (skip_prologue_sal): New variables saved_pc, force_skip and skip. Intialize force_skip from locations_valid. Move the prologue skipping code into two passes. * symtab.h (struct symtab): Make the primary field a bitfield. New field locations_valid. gdb/testsuite/ PR 12573 * gdb.dwarf2/dw2-skip-prologue.S: New file. * gdb.dwarf2/dw2-skip-prologue.c: New file. * gdb.dwarf2/dw2-skip-prologue.exp: New file. Patches: http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.12982&r2=1.12983 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/dwarf2read.c.diff?cvsroot=src&r1=1.529&r2=1.530 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/symtab.c.diff?cvsroot=src&r1=1.271&r2=1.272 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/symtab.h.diff?cvsroot=src&r1=1.181&r2=1.182 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.2698&r2=1.2699 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.dwarf2/dw2-skip-prologue.S.diff?cvsroot=src&r1=NONE&r2=1.1 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.dwarf2/dw2-skip-prologue.c.diff?cvsroot=src&r1=NONE&r2=1.1 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.dwarf2/dw2-skip-prologue.exp.diff?cvsroot=src&r1=NONE&r2=1.1
CVSROOT: /cvs/src Module name: src Branch: gdb_7_3-branch Changes by: jkratoch@sourceware.org 2011-05-06 15:13:38 Modified files: gdb : ChangeLog dwarf2read.c symtab.c symtab.h gdb/testsuite : ChangeLog Added files: gdb/testsuite/gdb.dwarf2: dw2-skip-prologue.S dw2-skip-prologue.c dw2-skip-prologue.exp Log message: gdb/ PR 12573 * dwarf2read.c (struct dwarf2_cu): New field has_loclist. (producer_is_gcc_ge_4_0): New function. (process_full_comp_unit): Set also symtab->locations_valid. Move the symtab->language code. (var_decode_location): Set cu->has_loclist. * symtab.c (skip_prologue_sal): New variables saved_pc, force_skip and skip. Intialize force_skip from locations_valid. Move the prologue skipping code into two passes. * symtab.h (struct symtab): Make the primary field a bitfield. New field locations_valid. gdb/testsuite/ PR 12573 * gdb.dwarf2/dw2-skip-prologue.S: New file. * gdb.dwarf2/dw2-skip-prologue.c: New file. * gdb.dwarf2/dw2-skip-prologue.exp: New file. Patches: http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&only_with_tag=gdb_7_3-branch&r1=1.12887.2.20&r2=1.12887.2.21 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/dwarf2read.c.diff?cvsroot=src&only_with_tag=gdb_7_3-branch&r1=1.518.2.2&r2=1.518.2.3 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/symtab.c.diff?cvsroot=src&only_with_tag=gdb_7_3-branch&r1=1.262.2.2&r2=1.262.2.3 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/symtab.h.diff?cvsroot=src&only_with_tag=gdb_7_3-branch&r1=1.173.2.1&r2=1.173.2.2 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&only_with_tag=gdb_7_3-branch&r1=1.2655.2.7&r2=1.2655.2.8 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.dwarf2/dw2-skip-prologue.S.diff?cvsroot=src&only_with_tag=gdb_7_3-branch&r1=NONE&r2=1.1.2.1 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.dwarf2/dw2-skip-prologue.c.diff?cvsroot=src&only_with_tag=gdb_7_3-branch&r1=NONE&r2=1.1.2.1 http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.dwarf2/dw2-skip-prologue.exp.diff?cvsroot=src&only_with_tag=gdb_7_3-branch&r1=NONE&r2=1.1.2.1
[commit+commit 7.3] -O2 -g breakpoints internal error + prologue skipping (PR 12573) http://sourceware.org/ml/gdb-patches/2011-05/msg00190.html GNU gdb (GDB) 7.3.50.20110506-cvs GNU gdb (GDB) 7.2.90.20110506-cvs Breakpoint 1 at 0x400600: file foo.cc, line 15. (2 locations)
*** Bug 13674 has been marked as a duplicate of this bug. ***