Re: [PATCH][gdb] Add tsan-suppressions.txt

[Tom de Vries <tdevries@suse.de>]

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On 7/12/22 10:39, Tom de Vries wrote:
> On 7/11/22 12:08, Tom de Vries wrote:
>> Hi,
>>
>> Add a new file tsan-suppressions.txt, to suppress the "unlock unlocked 
>> mutex"
>> problem in ncurses, filed in PR29328.
>>
>> For now, one needs to specify it manually using something like:
>> ...
>> $ export TSAN_OPTIONS=suppressions=$(pwd 
>> -P)/src/gdb/tsan-suppressions.txt
>> ...
>>
>> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29328
>>
>> Any comments?
>>
> 
> I just found that we already set ASAN_OPTIONS in lib/gdb.exp, so I've 
> added this TSAN_OPTIONS setting alongside.

I furthermore realized that suppression files are not cumulative, so if 
we have suppressions=a.txt:suppressions=b.txt then only b.txt is used.

This would mean we ignore any user-specified suppression files, which 
may contains more suppressions for whatever reason.

So I've updated the patch to only add the suppressions if the user 
didn't already do that.

Thanks,
- Tom

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[gdb] Add tsan-suppressions.txt

Add a new file tsan-suppressions.txt, to suppress the "unlock unlocked mutex"
problem in ncurses, filed in PR29328.

The file is added to the TSAN_OPTIONS in lib/gdb.exp.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29328

---
 gdb/testsuite/lib/gdb.exp | 26 ++++++++++++++++++++++++++
 gdb/tsan-suppressions.txt | 18 ++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index a29b8f947c4..698dd14504e 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -32,6 +32,32 @@ if {$tool == ""} {
 # (which will affect any spawned sub-process) to avoid this.
 append ::env(ASAN_OPTIONS) ",detect_leaks=0"
 
+# Add VAR_ID=VAL to ENV_VAR, unless ENV_VAR already contains a VAR_ID setting.
+
+proc set_sanitizer_default { env_var var_id val } {
+    global env
+
+    if { ![info exists env($env_var) ]
+	 || $env($env_var) == "" } {
+	# Set var_id (env_var non-existing / empty case).
+	append env($env_var) $var_id=$val
+	return
+    }
+
+    if { [regexp $var_id= $env($env_var)] } {
+	# Don't set var_id.  It's already set by the user, leave as is.
+	# Note that we could probably get the same result by unconditionally
+	# prepending it, but this way is less likely to cause confusion.
+	return
+    }
+
+    # Set var_id (env_var not empty case).
+    append env($env_var) : $var_id=$val
+}
+
+set_sanitizer_default TSAN_OPTIONS suppressions \
+    $srcdir/../tsan-suppressions.txt
+
 # List of procs to run in gdb_finish.
 set gdb_finish_hooks [list]
 
diff --git a/gdb/tsan-suppressions.txt b/gdb/tsan-suppressions.txt
new file mode 100644
index 00000000000..5f1e5dc7ea7
--- /dev/null
+++ b/gdb/tsan-suppressions.txt
@@ -0,0 +1,18 @@
+# Copyright (C) 2022 Free Software Foundation, Inc.
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Problem in ncurses, see:
+# - https://sourceware.org/bugzilla/show_bug.cgi?id=29328.
+# - https://lists.gnu.org/archive/html/bug-ncurses/2022-07/msg00002.html
+mutex:newterm