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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value
 after setting value
Date: Wed, 16 Nov 2022 14:03:20 +0000
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: tdep
X-Bugzilla-Version: 12.1
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: vries at gcc dot gnu.org
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29790

            Bug ID: 29790
           Summary: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after
                    setting value
           Product: gdb
           Version: 12.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tdep
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Once in a blue moon, our OBS runs on a machine with pkru support, and I got
(with a gdb 12.1-based package):
...
Running
/home/abuild/rpmbuild/BUILD/gdb-12.1/gdb/testsuite/gdb.arch/i386-pkru.exp .=
..
PASS: gdb.arch/i386-pkru.exp: probe PKRU support
PASS: gdb.arch/i386-pkru.exp: pkru register
PASS: gdb.arch/i386-pkru.exp: continue to breakpoint: break here 1
PASS: gdb.arch/i386-pkru.exp: read pkru register
PASS: gdb.arch/i386-pkru.exp: set pkru value
FAIL: gdb.arch/i386-pkru.exp: read value after setting value
PASS: gdb.arch/i386-pkru.exp: continue to breakpoint: break here 2
FAIL: gdb.arch/i386-pkru.exp: variable after reading pkru
...

In more detail:
...
(gdb) PASS: gdb.arch/i386-pkru.exp: read pkru register
print /x $pkru =3D 0x44444444^M
$3 =3D 0x44444444^M
(gdb) PASS: gdb.arch/i386-pkru.exp: set pkru value
info register pkru^M
pkru           0x12345678          305419896^M
(gdb) FAIL: gdb.arch/i386-pkru.exp: read value after setting value
...

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