From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by sourceware.org (Postfix) with ESMTPS id 16D0C385B18B for ; Mon, 28 Nov 2022 11:56:31 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 16D0C385B18B Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=suse.de Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 4C81D1F381; Mon, 28 Nov 2022 11:56:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1669636590; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=5pmA8vceOKDRzgf0ayUf5gAS7LxLHrQfgDCpZIrAK4M=; b=GT3p7F0FZZ6b6dMtbWlLZeoNrDvmGt+TuCbQRv9PbbEunysLSaDknQvoadYqiD1YcALkiY 47hSwbcQ6BBMia2pkMy6OqZUcWZQkhzFieZ3KbeCN11jcbC0zM5gbMzMULkIu7N2gCxGvD EamdggDJoGe1TkHSZSbwRzJ6gT0rp9c= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1669636590; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=5pmA8vceOKDRzgf0ayUf5gAS7LxLHrQfgDCpZIrAK4M=; b=vm7FwuekI/V5beo4BUtJF30rE4cbZTNer3ZaBKl6/tANgWtqn9Qk4fCgiSEctMms3YEsI9 YlCMdegRjaRNvYCQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 288741326E; Mon, 28 Nov 2022 11:56:30 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id JSC5CO6hhGN/UAAAMHmgww (envelope-from ); Mon, 28 Nov 2022 11:56:30 +0000 From: Tom de Vries To: gdb-patches@sourceware.org Cc: Carl Love , Ulrich Weigand , Tom Tromey Subject: [PATCH] [gdb/testsuite] Require hw watchpoint in gdb.ada/task_watch.exp Date: Mon, 28 Nov 2022 12:56:29 +0100 Message-Id: <20221128115629.31679-1-tdevries@suse.de> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: From: Tom de Vries On powerpc64le-linux I run into: ... (gdb) PASS: gdb.ada/task_watch.exp: info tasks before inserting breakpoint watch -location value task 3^M Watchpoint 2: -location value^M (gdb) PASS: gdb.ada/task_watch.exp: watch -location value task 3 continue^M Continuing.^M [Thread 0x7ffff7ccf170 (LWP 65550) exited]^M [Thread 0x7ffff7abf170 (LWP 65551) exited]^M FAIL: gdb.ada/task_watch.exp: continue to watchpoint (timeout) ... On x86_64-linux (where the test-case passes), a hardware watchpoint is used: ... (gdb) PASS: gdb.ada/task_watch.exp: info tasks before inserting breakpoint watch -location value task 3^M Hardware watchpoint 2: -location value^M ... and after forcing "set can-use-hw-watchpoints 0" we can intermittently reproduce the same failure. In the gdb documentation related to watchpoints in multi-threaded programs, we read: ... Warning: In multi-threaded programs, software watchpoints have only limited usefulness. If GDB creates a software watchpoint, it can only watch the value of an expression in a single thread. If you are confident that the expression can only change due to the current thread’s activity (and if you are also confident that no other thread can become current), then you can use software watchpoints as usual. However, GDB may not notice when a non-current thread’s activity changes the expression. (Hardware watchpoints, in contrast, watch an expression in all threads.) ... Since the ada task construct is mapped onto threads, it seems that the same limitation holds for tasks. Fix this by using skip_hw_watchpoint_tests. Tested on powerpc64-linux. --- gdb/testsuite/gdb.ada/task_watch.exp | 2 ++ 1 file changed, 2 insertions(+) diff --git a/gdb/testsuite/gdb.ada/task_watch.exp b/gdb/testsuite/gdb.ada/task_watch.exp index b22a6204e90..697074ac164 100644 --- a/gdb/testsuite/gdb.ada/task_watch.exp +++ b/gdb/testsuite/gdb.ada/task_watch.exp @@ -19,6 +19,8 @@ load_lib "ada.exp" if { [skip_ada_tests] } { return -1 } +if { [skip_hw_watchpoint_tests] } { return -1 } + standard_ada_testfile foo if {[gdb_compile_ada "${srcfile}" "${binfile}" executable {debug}] != ""} { -- 2.35.3