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* [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value
@ 2022-11-16 14:03 vries at gcc dot gnu.org
2022-11-17 7:33 ` [Bug tdep/29790] " vries at gcc dot gnu.org
` (6 more replies)
0 siblings, 7 replies; 8+ messages in thread
From: vries at gcc dot gnu.org @ 2022-11-16 14:03 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29790
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 = 0x44444444^M
$3 = 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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* [Bug tdep/29790] [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value
2022-11-16 14:03 [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value vries at gcc dot gnu.org
@ 2022-11-17 7:33 ` vries at gcc dot gnu.org
2022-12-16 22:30 ` vries at gcc dot gnu.org
` (5 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: vries at gcc dot gnu.org @ 2022-11-17 7:33 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29790
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Note: it happened both in gdb-i586-suse-linux-m32.sum and
gdb-i586-suse-linux-m32.-fno-PIE.-no-pie.sum, so it's not a fluke.
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* [Bug tdep/29790] [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value
2022-11-16 14:03 [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value vries at gcc dot gnu.org
2022-11-17 7:33 ` [Bug tdep/29790] " vries at gcc dot gnu.org
@ 2022-12-16 22:30 ` vries at gcc dot gnu.org
2023-01-02 10:07 ` vries at gcc dot gnu.org
` (4 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: vries at gcc dot gnu.org @ 2022-12-16 22:30 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29790
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
OK, that seems to be a kernel bug, fixed by commit 4a804c4f8356 (x86/fpu: Allow
PKRU to be (once again) written by ptrace.)
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* [Bug tdep/29790] [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value
2022-11-16 14:03 [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value vries at gcc dot gnu.org
2022-11-17 7:33 ` [Bug tdep/29790] " vries at gcc dot gnu.org
2022-12-16 22:30 ` vries at gcc dot gnu.org
@ 2023-01-02 10:07 ` vries at gcc dot gnu.org
2023-01-02 10:07 ` [Bug testsuite/29790] " vries at gcc dot gnu.org
` (3 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: vries at gcc dot gnu.org @ 2023-01-02 10:07 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29790
--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 14544
--> https://sourceware.org/bugzilla/attachment.cgi?id=14544&action=edit
Tentative patch
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* [Bug testsuite/29790] [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value
2022-11-16 14:03 [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value vries at gcc dot gnu.org
` (2 preceding siblings ...)
2023-01-02 10:07 ` vries at gcc dot gnu.org
@ 2023-01-02 10:07 ` vries at gcc dot gnu.org
2023-01-02 10:07 ` [Bug testsuite/29790] [gdb/testsuite] " vries at gcc dot gnu.org
` (2 subsequent siblings)
6 siblings, 0 replies; 8+ messages in thread
From: vries at gcc dot gnu.org @ 2023-01-02 10:07 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29790
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|tdep |testsuite
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* [Bug testsuite/29790] [gdb/testsuite] FAIL: gdb.arch/i386-pkru.exp: read value after setting value
2022-11-16 14:03 [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value vries at gcc dot gnu.org
` (3 preceding siblings ...)
2023-01-02 10:07 ` [Bug testsuite/29790] " vries at gcc dot gnu.org
@ 2023-01-02 10:07 ` vries at gcc dot gnu.org
2023-01-03 15:41 ` cvs-commit at gcc dot gnu.org
2023-01-03 15:42 ` vries at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: vries at gcc dot gnu.org @ 2023-01-02 10:07 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29790
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[gdb] FAIL: |[gdb/testsuite] FAIL:
|gdb.arch/i386-pkru.exp: |gdb.arch/i386-pkru.exp:
|read value after setting |read value after setting
|value |value
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* [Bug testsuite/29790] [gdb/testsuite] FAIL: gdb.arch/i386-pkru.exp: read value after setting value
2022-11-16 14:03 [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value vries at gcc dot gnu.org
` (4 preceding siblings ...)
2023-01-02 10:07 ` [Bug testsuite/29790] [gdb/testsuite] " vries at gcc dot gnu.org
@ 2023-01-03 15:41 ` cvs-commit at gcc dot gnu.org
2023-01-03 15:42 ` vries at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2023-01-03 15:41 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29790
--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=b46632ca16021962c33c2ea32b8104fd258ef0af
commit b46632ca16021962c33c2ea32b8104fd258ef0af
Author: Tom de Vries <tdevries@suse.de>
Date: Tue Jan 3 16:41:05 2023 +0100
[gdb/testsuite] Add xfail in gdb.arch/i386-pkru.exp
On a x86_64-linux machine with pkru register, I run into:
...
(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
...
This is a regression due to kernel commit e84ba47e313d ("x86/fpu: Hook up
PKRU
onto ptrace()"). This is fixed by recent kernel commit 4a804c4f8356
("x86/fpu: Allow PKRU to be (once again) written by ptrace.").
The regression occurs for kernel versions v5.14-rc1 (the first tag
containing
the regression) up to but excluding v6.2-rc1 (the first tag containing the
fix).
Fix this by adding an xfail for the appropriate kernel versions.
Tested on x86_64-linux.
PR testsuite/29790
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29790
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* [Bug testsuite/29790] [gdb/testsuite] FAIL: gdb.arch/i386-pkru.exp: read value after setting value
2022-11-16 14:03 [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value vries at gcc dot gnu.org
` (5 preceding siblings ...)
2023-01-03 15:41 ` cvs-commit at gcc dot gnu.org
@ 2023-01-03 15:42 ` vries at gcc dot gnu.org
6 siblings, 0 replies; 8+ messages in thread
From: vries at gcc dot gnu.org @ 2023-01-03 15:42 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29790
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
Target Milestone|--- |14.1
--- Comment #5 from Tom de Vries <vries at gcc dot gnu.org> ---
Fixed by commit.
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2022-11-16 14:03 [Bug tdep/29790] New: [gdb] FAIL: gdb.arch/i386-pkru.exp: read value after setting value vries at gcc dot gnu.org
2022-11-17 7:33 ` [Bug tdep/29790] " vries at gcc dot gnu.org
2022-12-16 22:30 ` vries at gcc dot gnu.org
2023-01-02 10:07 ` vries at gcc dot gnu.org
2023-01-02 10:07 ` [Bug testsuite/29790] " vries at gcc dot gnu.org
2023-01-02 10:07 ` [Bug testsuite/29790] [gdb/testsuite] " vries at gcc dot gnu.org
2023-01-03 15:41 ` cvs-commit at gcc dot gnu.org
2023-01-03 15:42 ` vries at gcc dot gnu.org
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