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Thu, 12 Sep 2024 14:28:50 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id EfeVFaL64mbZBAAAD6G6ig (envelope-from ); Thu, 12 Sep 2024 14:28:50 +0000 From: Fabiano Rosas To: Peter Maydell Cc: Peter Xu , Hyman Huang , qemu-devel@nongnu.org, Eric Blake , Markus Armbruster , David Hildenbrand , Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= , Paolo Bonzini Subject: Re: [PATCH RFC 10/10] tests/migration-tests: Add test case for responsive CPU throttle In-Reply-To: References: <96eeea4efd3417212d6e2639bc118b90d4dcf926.1725889277.git.yong.huang@smartx.com> <87frq8lcgp.fsf@suse.de> <87seu7qhao.fsf@suse.de> <87ed5qq8e2.fsf@suse.de> <87bk0trifq.fsf@suse.de> <87wmjhvv7e.fsf@suse.de> Date: Thu, 12 Sep 2024 11:28:48 -0300 Message-ID: <87a5gdgd3z.fsf@suse.de> MIME-Version: 1.0 Content-Type: text/plain X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; MISSING_XM_UA(0.00)[]; MIME_TRACE(0.00)[0:+]; RCPT_COUNT_SEVEN(0.00)[9]; MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_BLOCKED(0.00)[rspamd.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:mid] Received-SPF: pass client-ip=195.135.223.130; envelope-from=farosas@suse.de; helo=smtp-out1.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=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 Peter Maydell writes: > On Thu, 12 Sept 2024 at 14:48, Fabiano Rosas wrote: >> Peter Maydell writes: >> > For some examples from this week: >> > >> > https://gitlab.com/qemu-project/qemu/-/jobs/7802183144 >> > https://gitlab.com/qemu-project/qemu/-/jobs/7799842373 >> > https://gitlab.com/qemu-project/qemu/-/jobs/7786579152 >> > https://gitlab.com/qemu-project/qemu/-/jobs/7786579155 >> >> About these: >> >> There are 2 instances of plain-old-SIGSEGV here. Both happen in >> non-x86_64 runs and on the /multifd/tcp/plain/cancel test, which means >> they're either races or memory ordering issues. Having i386 crashing >> points to the former. So having the CI loaded and causing timeouts is >> probably what exposed the issue. > > They're also both TCI. Would these tests be relying on > specific atomic-access behaviour in the guest code that's > running, or is all the avoidance-of-races in the migration > code in QEMU itself? I misspoke about memory ordering, this is all just the x86 host and the multifd threads in QEMU having synchronization issues. > > (I don't know of any particular problems with TCI's > implementation of atomic accesses, so this is just a stab > in the dark.) > > thanks > -- PMM