x86_64 ldd hangs running on a DLL

[Jon Turney]

On 18/05/2023 02:46, Rodney Brown via Cygwin wrote:
> $ uname -a
> CYGWIN_NT-10.0-19045 X 3.4.6-1.x86_64 2023-02-14 13:23 UTC x86_64 Cygwin
> $ ldd --version
> ldd (cygwin) 3.4.6
> 
> As with "ldd freezes" https://sourceware.org/legacy-ml/cygwin/2015-07/msg00314.html , cygcheck works,
> not only for Cygwin DLLs and ldd hangs needing the xterm to be closed, though it can interrupted when run
> under strace, or did. Strace now is segfaulting.

What changed to make it start segfaulting?

> Did Corinna's fix for i686 not end up in the x86_64 code?

The claim here seems to be: ldd is broken on x86_64 for all dlls, and 
has been since 2015, and nobody has noticed.

While possible, this seems unlikely.

All I can tell you is that it appears to WFM.  Perhaps you can provide 
some more details?

> $ ldd /usr/bin/cygwin1.dll
>         ntdll.dll => /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll (0x7ffe56090000)
>         KERNEL32.DLL => /cygdrive/c/WINDOWS/System32/KERNEL32.DLL (0x7ffe54a90000)
>         KERNELBASE.dll => /cygdrive/c/WINDOWS/System32/KERNELBASE.dll (0x7ffe53c40000)
>         msvcrt.dll => /cygdrive/c/WINDOWS/System32/msvcrt.dll (0x7ffe55750000)
>         advapi32.dll => /cygdrive/c/WINDOWS/System32/advapi32.dll (0x7ffe54d90000)
>         sechost.dll => /cygdrive/c/WINDOWS/System32/sechost.dll (0x7ffe549b0000)
>         RPCRT4.dll => /cygdrive/c/WINDOWS/System32/RPCRT4.dll (0x7ffe55570000)
>         CRYPTBASE.DLL => /cygdrive/c/WINDOWS/SYSTEM32/CRYPTBASE.DLL (0x7ffe53060000)
>         bcryptPrimitives.dll => /cygdrive/c/WINDOWS/System32/bcryptPrimitives.dll (0x7ffe53770000)