Re: lib/59652: DNS utilities core dump in -current

["Nick Hudson via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR toolchain/59652; it has been noted by GNATS.

From: Nick Hudson <nick.hudson%gmx.co.uk@localhost>
To: gnats-bugs%netbsd.org@localhost, lib-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost, brandon%burn.net@localhost
Cc: 
Subject: Re: lib/59652: DNS utilities core dump in -current
Date: Mon, 29 Sep 2025 18:27:01 +0100

 More analysis shows me it's a ld.elf_so bug that means the data isn't=20
 aligned correctly relative to the struct tcb_tls for__HAVE_TLS_VARIANT_I
 
 I didn't check __HAVE_TLS_VARIANT_II yet.
 
 Here's a little test program that fails.
 
 #include <inttypes.h>
 #include <assert.h>
 
 #define ALIGNMENT       64
 
 #define MAGIC1  0xaa55aa55aa55aa55
 #define MAGIC2  0xc0ffeeeeeeeeeeee
 #define MAGIC3  0xff00ff00ff00ff00
 
 __thread
 struct {
          uint64_t magic1;
          uint64_t magic2 __attribute__((aligned(ALIGNMENT)));
          uint64_t magic3;
 } tls_data =3D {
          .magic1 =3D MAGIC1,
          .magic2 =3D MAGIC2,
          .magic3 =3D MAGIC3,
 };
 
 int
 main()
 {
          assert(tls_data.magic1 =3D=3D MAGIC1);
          assert(tls_data.magic2 =3D=3D MAGIC2);
          assert(tls_data.magic3 =3D=3D MAGIC3);
 }