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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug dynamic-link/29235] Some tests crash in ELF_DYNAMIC_DO_RELR on
 powerpc64le
Date: Thu, 09 Jun 2022 10:38:43 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29235

--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
With hard-coded paths in tests, I get:

(gdb) print where
$3 =3D (Elf64_Addr *) 0x100255db8

which is in this read-only mapping:

100160000-100260000 r--p 00160000 08:03 2153963751=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
/builddir/build/BUILD/glibc-2.35.9000-583-gace9e3edbc/build-2/math/test-tgm=
ath3-fma

0000000000255db8 appears in readelf -rW output, so I don't think ld.so's RE=
LR
implementation is at fault.

It looks like page size issue, and the DT_RELR may be accidental. The system
has 64K pages, but we have for the main executable:

  LOAD           0x160000 0x0000000000160000 0x0000000000160000 0x0f10a4
0x0f10a4 R   0x10000
  LOAD           0x255db0 0x0000000000265db0 0x0000000000265db0 0x06a40c
0x06a988 RW  0x10000
[=E2=80=A6]
  GNU_RELRO      0x255db0 0x0000000000265db0 0x0000000000265db0 0x06a250
0x06a250 R   0x1

I'm not sure if this kind of layout is supposed to work with 64K pages. Note
that as discussed elsewhere, ld.so rounds down 0x255db0 to the next multipl=
e of
65,536.

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