On Sat, 09 Dec 2017 19:13:24 +0100, Richard Shaw wrote:
> #9 0x00007ffff621f891 in __libc_start_main (main=0x0, argc=0, argv=0x0,
> init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
> stack_end=0x0) at ../csu/libc-start.c:329
> result = <optimized out>
> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {4309931, 0, 4217114,
> 140737488346352, 4210861, 140737322809482, 140737322809482,
> 140737300163376}, mask_was_saved = -8968}}, priv = {pad =
> {0x2ffffdd10, 0x404084 <main_stub>, 0x0, 0xb0bfd26695729445}, data = {
> prev = 0x2ffffdd10, cleanup = 0x404084 <main_stub>,
> canceltype = 0}}}
> not_first_call = <optimized out>
> #10 0x0000000000000000 in ?? ()
> No symbol table info available.
That is OK, you cannot have symbols for address zero.
What glibc it is? On glibc-2.26-16.fc27.x86_64 I get:
#2 0x00007ffff7a2bbda in __GI_exit (status=<optimized out>) at exit.c:105
No locals.
#3 0x00007ffff7a11041 in __libc_start_main (main=0x4004ee <main>, argc=1, argv=0x7fffffffd7b8, init=<optimized out>,
fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffd7a8) at ../csu/libc-start.c:342
result = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -7823762895322290015, 4195344, 140737488345008, 0, 0, 7823762346505857185,
7823745254383347873}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x7ffff7de5e83 <_dl_init+259>,
0x7ffff7dcb790 <__elf_set___libc_subfreeres_element_free_mem__>}, data = {prev = 0x0, cleanup = 0x0,
canceltype = -136421757}}}
not_first_call = <optimized out>
#4 0x000000000040043a in _start ()
No symbol table info available.
The bug is that GDB should find out the return address from __libc_start_main
(to be 0x40043a in _start) which it does not in your case.
Then "No symbol table info available." is in fact OK for _start as that is
only asm-coded function with ELF symbol but with no DWARF symbol.
Jan
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