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Mon, 03 Nov 2025 23:41:19 -0800 (PST) X-Google-Smtp-Source: AGHT+IFEBduTRObamzJWM6WVJLhbFF2quqadBk3SSMj1hkVuKXqPq/WqHIThWeUczPeR6DlQE/vE1A== X-Received: by 2002:a05:6000:26c1:b0:429:8b01:c093 with SMTP id ffacd0b85a97d-429bd680c85mr12362433f8f.15.1762242079174; Mon, 03 Nov 2025 23:41:19 -0800 (PST) Received: from [192.168.0.7] ([47.64.114.171]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4773d81cb03sm189975675e9.13.2025.11.03.23.41.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 Nov 2025 23:41:18 -0800 (PST) Message-ID: <30a9e854-e37b-4494-b372-f76ce6bdce25@redhat.com> Date: Tue, 4 Nov 2025 08:41:17 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Regression with the "replay" test on target alpha To: Akihiko Odaki , Paolo Bonzini , qemu-devel@nongnu.org Cc: Dmitry Osipenko , Richard Henderson References: <20251028173430.2180057-1-pbonzini@redhat.com> <20251028173430.2180057-4-pbonzini@redhat.com> Content-Language: en-US From: Thomas Huth Autocrypt: addr=thuth@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 04/11/2025 02.45, Akihiko Odaki wrote: > On 2025/11/03 22:59, Thomas Huth wrote: >> On 28/10/2025 18.34, Paolo Bonzini wrote: >>> From: Akihiko Odaki >>> >>> Borrow the concept of force quiescent state from Linux to ensure readers >>> remain fast during normal operation and to avoid stalls. >> >>   Hi Akihiko, >> >> looks like this commit has introduced a regression with the "replay" >> functional test on the alpha target. >> When I run something like: >> >>   pyvenv/bin/meson test --no-rebuild -t 1 --setup thorough \ >>    --num-processes 1 --repeat 10 func-alpha-replay >> >> in the build folder, approx. half of the test runs are failing for me now. >> >> I bisected the issue to this patch here - when I rebuild qemu-system- >> alpha with the commit right before this change here, the above test runs >> work fine, so I'm pretty sure that the problem has been introduced by this >> commit here. >> >> Could you please have a look? > > I cannot reproduce it with commit 55d98e3edeeb ("rcu: Unify force quiescent > state"). > > Can you provide meson-logs/testlog-thorough.txt so that I can look into the > failure you are facing? If you think you have something useful for > debugging, please share it to me too. There's not much in that testlog-thorough.txt that could be helpful here, it's basically just the information that the test has been killed due to the timeout: ==================================== 1/1 =================================== test: qemu:func-thorough+func-alpha-thorough+thorough / func-alpha-replay start time: 07:25:26 duration: 90.01s result: killed by signal 15 SIGTERM command: RUST_BACKTRACE=1 QEMU_TEST_QEMU_IMG=/tmp/qemu-rcu/qemu-img QEMU_TEST_GDB=/usr/bin/gdb MALLOC_PERTURB_=255 MESON_TEST_ITERATION=1 PYTHONPATH=/home/thuth/devel/qemu/python:/home/thuth/devel/qemu/tests/functional G_TEST_SLOW=1 SPEED=thorough QEMU_TEST_QEMU_BINARY=/tmp/qemu-rcu/qemu-system-alpha ASAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1 LD_LIBRARY_PATH=/tmp/qemu-rcu/tests/tcg/plugins:/tmp/qemu-rcu/contrib/plugins UBSAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1:print_stacktrace=1 MSAN_OPTIONS=halt_on_error=1:abort_on_error=1:print_summary=1:print_stacktrace=1 QEMU_BUILD_ROOT=/tmp/qemu-rcu /tmp/qemu-rcu/pyvenv/bin/python3 /home/thuth/devel/qemu/tests/functional/alpha/test_replay.py ============================================================================= Summary of Failures: 1/1 qemu:func-thorough+func-alpha-thorough+thorough / func-alpha-replay TIMEOUT 90.01s killed by signal 15 SIGTERM There is also not that much helpful information in tests/functional/alpha/test_replay.AlphaReplay.test_clipper, apart from the console.log file. For a good run, the console log looks like this: 2025-11-04 08:16:46,148: PCI: 00:01:0 class 0101 id 1095:0646 2025-11-04 08:16:46,149: PCI: region 0: 0000c000 2025-11-04 08:16:46,149: PCI: region 1: 0000c008 2025-11-04 08:16:46,149: PCI: region 2: 0000c010 2025-11-04 08:16:46,149: PCI: region 3: 0000c018 2025-11-04 08:16:46,149: PCI: region 4: 0000c020 2025-11-04 08:16:46,149: PCI: 00:07:0 class 0601 id 8086:0484 2025-11-04 08:16:48,149: [ 0.000000] Initializing cgroup subsys cpu 2025-11-04 08:16:48,149: [ 0.000000] Linux version 2.6.26-2-alpha-generic (Debian 2.6.26-29) (dannf@debian.org) (gcc version 4.1.3 20080704 (prerelease) (Debian 4.1.2-25)) #1 Sun Mar 4 21:08:03 UTC 2012 2025-11-04 08:16:48,150: [ 0.000000] Booting GENERIC on Tsunami variation Clipper using machine vector Clipper from SRM 2025-11-04 08:16:48,150: [ 0.000000] Major Options: MAGIC_SYSRQ 2025-11-04 08:16:48,150: [ 0.000000] Command line: printk.time=0 console=ttyS0 2025-11-04 08:16:48,150: [ 0.000000] memcluster 0, usage 1, start 0, end 15 2025-11-04 08:16:48,150: [ 0.000000] memcluster 1, usage 0, start 15, end 16384 2025-11-04 08:16:48,150: [ 0.000000] freeing pages 15:2048 2025-11-04 08:16:48,150: [ 0.000000] freeing pages 2987:16384 2025-11-04 08:16:48,151: [ 0.000000] reserving pages 2987:2988 2025-11-04 08:16:48,151: [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16272 2025-11-04 08:16:48,151: [ 0.000000] Kernel command line: printk.time=0 console=ttyS0 2025-11-04 08:16:57,358: PCI: 00:01:0 class 0101 id 1095:0646 2025-11-04 08:16:57,358: PCI: region 0: 0000c000 2025-11-04 08:16:57,358: PCI: region 1: 0000c008 2025-11-04 08:16:57,359: PCI: region 2: 0000c010 2025-11-04 08:16:57,359: PCI: region 3: 0000c018 2025-11-04 08:16:57,359: PCI: region 4: 0000c020 2025-11-04 08:16:57,360: PCI: 00:07:0 class 0601 id 8086:0484 2025-11-04 08:17:08,468: [ 0.000000] Initializing cgroup subsys cpu 2025-11-04 08:17:08,470: [ 0.000000] Linux version 2.6.26-2-alpha-generic (Debian 2.6.26-29) (dannf@debian.org) (gcc version 4.1.3 20080704 (prerelease) (Debian 4.1.2-25)) #1 Sun Mar 4 21:08:03 UTC 2012 2025-11-04 08:17:08,471: [ 0.000000] Booting GENERIC on Tsunami variation Clipper using machine vector Clipper from SRM 2025-11-04 08:17:08,471: [ 0.000000] Major Options: MAGIC_SYSRQ 2025-11-04 08:17:08,472: [ 0.000000] Command line: printk.time=0 console=ttyS0 2025-11-04 08:17:08,472: [ 0.000000] memcluster 0, usage 1, start 0, end 15 2025-11-04 08:17:08,473: [ 0.000000] memcluster 1, usage 0, start 15, end 16384 2025-11-04 08:17:08,473: [ 0.000000] freeing pages 15:2048 2025-11-04 08:17:08,474: [ 0.000000] freeing pages 2987:16384 2025-11-04 08:17:08,474: [ 0.000000] reserving pages 2987:2988 2025-11-04 08:17:08,475: [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16272 2025-11-04 08:17:08,476: [ 0.000000] Kernel command line: printk.time=0 console=ttyS0 I.e. the replay worked as expected. When it fails, console.log only contains: 2025-11-04 08:25:26,601: PCI: 00:01:0 class 0101 id 1095:0646 2025-11-04 08:25:26,601: PCI: region 0: 0000c000 2025-11-04 08:25:26,601: PCI: region 1: 0000c008 2025-11-04 08:25:26,601: PCI: region 2: 0000c010 2025-11-04 08:25:26,601: PCI: region 3: 0000c018 2025-11-04 08:25:26,601: PCI: region 4: 0000c020 2025-11-04 08:25:26,602: PCI: 00:07:0 class 0601 id 8086:0484 2025-11-04 08:25:28,601: [ 0.000000] Initializing cgroup subsys cpu 2025-11-04 08:25:28,602: [ 0.000000] Linux version 2.6.26-2-alpha-generic (Debian 2.6.26-29) (dannf@debian.org) (gcc version 4.1.3 20080704 (prerelease) (Debian 4.1.2-25)) #1 Sun Mar 4 21:08:03 UTC 2012 2025-11-04 08:25:28,602: [ 0.000000] Booting GENERIC on Tsunami variation Clipper using machine vector Clipper from SRM 2025-11-04 08:25:28,602: [ 0.000000] Major Options: MAGIC_SYSRQ 2025-11-04 08:25:28,602: [ 0.000000] Command line: printk.time=0 console=ttyS0 2025-11-04 08:25:28,602: [ 0.000000] memcluster 0, usage 1, start 0, end 15 2025-11-04 08:25:28,602: [ 0.000000] memcluster 1, usage 0, start 15, end 16384 2025-11-04 08:25:28,602: [ 0.000000] freeing pages 15:2048 2025-11-04 08:25:28,603: [ 0.000000] freeing pages 2987:16384 2025-11-04 08:25:28,603: [ 0.000000] reserving pages 2987:2988 2025-11-04 08:25:28,603: [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16272 2025-11-04 08:25:28,603: [ 0.000000] Kernel command line: printk.time=0 console=ttyS0 I.e. the replay did not work. Could this RCU stuff somehow influence the replay mechanism in QEMU? Thomas