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Date: Wed, 14 Feb 2024 14:30:32 +0100
To: cygwin AT cygwin DOT com
Subject: Re: Cygwin installer hangs when running post-install scripts
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>,
        Kevin Ushey <kevinushey AT gmail DOT com>
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On Feb 14 10:52, Corinna Vinschen via Cygwin wrote:
> On Feb 13 15:48, Kevin Ushey via Cygwin wrote:
> > Here's a bit more information from a debug build of cygwin; here I'm
> > just trying to launch cygpath.exe:
> > 
> > (gdb) f 1
> > #1  0x00007ffa0123ba1f in find_fast_cwd_pointer () at
> > ../../../../winsup/cygwin/path.cc:4526
> > 4526      const uint8_t *lock = (const uint8_t *)
> > 
> > (gdb) bt
> > #0  memmem (haystack=<optimized out>, hs_len=<optimized out>,
> > needle=0x7ffa0142e531 <_C_collate_locale+59857>, ne_len=4) at
> > ../../../newlib/libc/string/memmem.c:161
> > #1  0x00007ffa0123ba1f in find_fast_cwd_pointer () at
> > ../../../../winsup/cygwin/path.cc:4526
> > [...]
> 
> Ok, so we know now which memmem call fails, so the next question is,
> why?  The haystack address is unfortunately still optimized out in
> memmem, so it looks like the newlib subdir is still optimized.
> But it's pretty certainly a wrong haystack address.  This address has
> been fetched from
> 
>   const uint8_t *rcall = (const uint8_t *) memchr (get_dir, 0xe8, 80);
>   ...
>   const uint8_t *use_cwd = rcall + 5 + peek32 (rcall + 1);
> 
> Chances are high, that the call instruction found by rcall is bogus.

Can you run this in GDB?  I'd love to see the assembler code starting at
address `get_dir'...


Corinna

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