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From: "nars at yottadb dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29863] Segmentation fault in memcmp-sse2.S if memory
 contents can concurrently change
Date: Tue, 13 Dec 2022 23:16:01 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29863

--- Comment #14 from Narayanan Iyer <nars at yottadb dot com> ---
(In reply to Noah Goldstein from comment #13)
>=20
> Can you test the following dif:
> ```
> @@ -308,7 +308,7 @@ L(ret_nonzero_vec_end_0):
>   setg %dl
>   leal -1(%rdx, %rdx), %eax
>  #  else
> - addl %edx, %eax
> + addq %rdx, %rax
>   movzbl (VEC_SIZE * -1 + SIZE_OFFSET)(%rsi, %rax), %ecx
>   movzbl (VEC_SIZE * -1 + SIZE_OFFSET)(%rdi, %rax), %eax
>   subl %ecx, %eax
>=20
> ```
>=20
> If that fixes things I'm okay making the change.
>=20
> I'm opposed to explicitly supporting it, but am happy
> to try and make this failure from the unsupported
> usage less dramatic.

This change sounds much better.

Is there a url that describes how to build glibc from source and use it in =
my
application?

--=20
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