Re: wip/ladybird-git dies in _rtld_call_ifunc

[RVP <rvp%SDF.ORG@localhost>]

On Fri, 5 Jul 2024, Thomas Klausner wrote:

> I sometimes try running wip/ladybird-git on NetBSD, and it reached
> github.com once already.
>
> Not so right now, it dies during startup even before showing a window, in
>
> (gdb) r
> Starting program: /usr/pkg/bin/Ladybird
>
> Program received signal SIGSEGV, Segmentation fault.
> _rtld_call_ifunc (obj=0x77d34d728800, mask=mask@entry=0x7f7fffc5ded0, cur_objgen=cur_objgen@entry=1)
>    at /usr/src/libexec/ld.elf_so/reloc.c:311
> 311                             *where = target;
> (gdb) bt
> #0  _rtld_call_ifunc (obj=0x77d34d728800, mask=mask@entry=0x7f7fffc5ded0, cur_objgen=cur_objgen@entry=1)
>    at /usr/src/libexec/ld.elf_so/reloc.c:311
> #1  0x00007f7ff78f9284 in _rtld_call_ifunc_functions (cur_objgen=1, obj=<optimized out>, mask=0x7f7fffc5ded0)
>    at /usr/src/libexec/ld.elf_so/rtld.c:280
> #2  _rtld_call_init_functions (mask=mask@entry=0x7f7fffc5ded0)
>    at /usr/src/libexec/ld.elf_so/rtld.c:304
> #3  0x00007f7ff78f9de5 in _rtld (sp=<optimized out>, relocbase=<optimized out>)
>    at /usr/src/libexec/ld.elf_so/rtld.c:795
> #4  0x00007f7ff78f3033 in rtld_start () from /usr/libexec/ld.elf_so
> #5  0x0000000000000000 in ?? ()
>
> Is this a problem in NetBSD or ladybird? There's no code from Ladybird
> in the backtrace, but perhaps it's hidden behind frame 5.

PR #57792 strikes again, I think. The stack traces look identical--but, this
is C++ code and I can't locate where it's doing its ifunc thing. If you a
stack trace like this, Thomas, just remove `Wl,-z,now' from the linker flags.

-RVP