gdb broken on stable/11 and current?

[K. Macy]

kgdb7111 is what you use for kernel. It works fine for me.


On Thu, Dec 8, 2016 at 08:29 Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:

> On Thu, Dec 08, 2016 at 04:01:04PM +0000, K. Macy wrote:
>
>
>
> > In tree gdb doesn't work for much of anything these days. It can't even
>
> > consistently give a complete kernel backtrace. Jhb is graciously
>
> > maintaining gdb in ports. It will be installed as the awkwardly named
>
> > gdb7111 IIRC.
>
>
>
> 1. gdb7111 badly integrated w/ 11 and up (don't see kernel debug
>
> symbols)
>
> 2. all included in base systems can't be core dumped.
>
>
>
> > On Thu, Dec 8, 2016 at 06:53 Slawa Olhovchenkov <slw at zxy.spb.ru> wrote:
>
> >
>
> > > % gdb ./edge_stat
>
> > >
>
> > > GNU gdb 6.1.1 [FreeBSD]
>
> > >
>
> > > 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 "amd64-marcel-freebsd"...
>
> > >
>
> > > (gdb) break main
>
> > >
>
> > > Segmentation fault (core dumped)
>
> > >
>
> > >
>
> > >
>
> > > % gdb /usr/bin/gdb /tmp/gdb.13573.core
>
> > >
>
> > > GNU gdb 6.1.1 [FreeBSD]
>
> > >
>
> > > 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 "amd64-marcel-freebsd"...(no debugging
> symbols
>
> > > found)...
>
> > >
>
> > > Core was generated by `gdb'.
>
> > >
>
> > > Program terminated with signal 11, Segmentation fault.
>
> > >
>
> > > Reading symbols from /lib/libm.so.5...(no debugging symbols
> found)...done.
>
> > >
>
> > > Loaded symbols for /lib/libm.so.5
>
> > >
>
> > > Reading symbols from /lib/libncursesw.so.8...(no debugging symbols
>
> > > found)...done.
>
> > >
>
> > > Loaded symbols for /lib/libncursesw.so.8
>
> > >
>
> > > Reading symbols from /usr/lib/libgnuregex.so.5...(no debugging symbols
>
> > > found)...done.
>
> > >
>
> > > Loaded symbols for /usr/lib/libgnuregex.so.5
>
> > >
>
> > > Reading symbols from /lib/libc.so.7...(no debugging symbols
> found)...done.
>
> > >
>
> > > Loaded symbols for /lib/libc.so.7
>
> > >
>
> > > Reading symbols from /usr/lib/libthread_db.so...(no debugging symbols
>
> > > found)...done.
>
> > >
>
> > > Loaded symbols for /usr/lib/libthread_db.so
>
> > >
>
> > > Reading symbols from /libexec/ld-elf.so.1...(no debugging symbols
>
> > > found)...done.
>
> > >
>
> > > Loaded symbols for /libexec/ld-elf.so.1
>
> > >
>
> > > #0  0x00000000005da00b in cplus_demangle_v3_callback ()
>
> > >
>
> > > (gdb) bt
>
> > >
>
> > > #0  0x00000000005da00b in cplus_demangle_v3_callback ()
>
> > >
>
> > > #1  0x00000000005d9f9c in cplus_demangle_v3 ()
>
> > >
>
> > > #2  0x00000000005ca13c in cplus_demangle ()
>
> > >
>
> > > #3  0x0000000000487454 in class_name_from_physname ()
>
> > >
>
> > > #4  0x000000000053a4f3 in dwarf2_read_section ()
>
> > >
>
> > > #5  0x000000000053a0cc in dwarf2_read_section ()
>
> > >
>
> > > #6  0x0000000000539bd9 in dwarf2_read_section ()
>
> > >
>
> > > #7  0x0000000000537395 in dwarf2_read_section ()
>
> > >
>
> > > #8  0x0000000000539c21 in dwarf2_read_section ()
>
> > >
>
> > > #9  0x0000000000539643 in dwarf2_read_section ()
>
> > >
>
> > > #10 0x0000000000538a6c in dwarf2_read_section ()
>
> > >
>
> > > #11 0x00000000005352fb in dwarf2_read_section ()
>
> > >
>
> > > #12 0x0000000000533bfd in dwarf2_read_section ()
>
> > >
>
> > > #13 0x00000000004cfc46 in psymtab_to_symtab ()
>
> > >
>
> > > #14 0x00000000004c9cfb in lookup_symbol_global ()
>
> > >
>
> > > #15 0x0000000000482273 in cp_lookup_symbol_namespace ()
>
> > >
>
> > > #16 0x0000000000482059 in cp_lookup_symbol_nonlocal ()
>
> > >
>
> > > #17 0x0000000000481f63 in cp_lookup_symbol_nonlocal ()
>
> > >
>
> > > #18 0x00000000004c9780 in lookup_symbol ()
>
> > >
>
> > > #19 0x00000000005035cf in find_imps ()
>
> > >
>
> > > #20 0x0000000000514df9 in decode_line_1 ()
>
> > >
>
> > > #21 0x0000000000514589 in decode_line_1 ()
>
> > >
>
> > > #22 0x000000000046eff9 in _initialize_breakpoint ()
>
> > >
>
> > > #23 0x000000000046f48b in _initialize_breakpoint ()
>
> > >
>
> > > #24 0x00000000004ab289 in catch_exceptions ()
>
> > >
>
> > > #25 0x00000000004ab368 in catch_exceptions_with_msg ()
>
> > >
>
> > > #26 0x000000000046b169 in break_command ()
>
> > >
>
> > > #27 0x00000000004ab996 in execute_command ()
>
> > >
>
> > > #28 0x0000000000465293 in gdb_disable_readline ()
>
> > >
>
> > > #29 0x0000000000465182 in gdb_setup_readline ()
>
> > >
>
> > > #30 0x00000000005e266f in rl_callback_read_char ()
>
> > >
>
> > > #31 0x0000000000464c79 in gdb_setup_readline ()
>
> > >
>
> > > #32 0x0000000000465a46 in gdb_do_one_event ()
>
> > >
>
> > > #33 0x00000000004ab289 in catch_exceptions ()
>
> > >
>
> > > #34 0x00000000004ab42a in catch_errors ()
>
> > >
>
> > > #35 0x0000000000551168 in _initialize_tui_interp ()
>
> > >
>
> > > #36 0x0000000000448689 in gdb_main ()
>
> > >
>
> > > #37 0x00000000004ab289 in catch_exceptions ()
>
> > >
>
> > > #38 0x00000000004ab42a in catch_errors ()
>
> > >
>
> > > #39 0x0000000000448526 in gdb_main ()
>
> > >
>
> > > #40 0x00000000004ab289 in catch_exceptions ()
>
> > >
>
> > > #41 0x00000000004ab42a in catch_errors ()
>
> > >
>
> > > #42 0x0000000000447977 in gdb_main ()
>
> > >
>
> > > #43 0x0000000000447931 in main ()
>
> > >
>
> > > _______________________________________________
>
> > >
>
> > > freebsd-stable at freebsd.org mailing list
>
> > >
>
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>
> > >
>
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>
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>
> > >
>
>