[{"id":3688030,"web_url":"http://patchwork.ozlabs.org/comment/3688030/","msgid":"","list_archive_url":null,"date":"2026-05-07T19:57:24","subject":"Re: [PULL 13/23] migration: Calculate expected downtime on demand","submitter":{"id":5111,"url":"http://patchwork.ozlabs.org/api/people/5111/","name":"Peter Maydell","email":"peter.maydell@linaro.org"},"content":"On Tue, 5 May 2026 at 21:29, Peter Xu wrote:\n>\n> This value does not need to be calculated as frequent. Only calculate it\n> on demand when query-migrate happened. With that we can remove the\n> variable in MigrationState.\n>\n> This paves way for fixing this value to include all modules (not only RAM\n> but others too).\n>\n> Reviewed-by: Juraj Marcin \n> Link: https://lore.kernel.org/r/20260421202110.306051-12-peterx@redhat.com\n> Signed-off-by: Peter Xu \n\nHi; I'm seeing a clang undefined-behaviour sanitizer failure\nin the code introduced in this change when running the\naarch64 migration-test via \"make check\" on an x86-64 host.\n\nIt seems to happen fairly reliably when I do a \"make check -j20\",\nbut not when I run the test on its own, so it's probably load dependent.\n\nHere's the backtrace:\n\n../../migration/migration.c:1051:12: runtime error: inf is outside the\nrange of representable values of type 'long'\n #0 0x57b49d635c0d in migration_downtime_calc_expected\n/home/pm215/qemu/build/arm-clang/../../migration/migration.c:1051:12\n #1 0x57b49d63e860 in populate_time_info\n/home/pm215/qemu/build/arm-clang/../../migration/migration.c:1075:35\n #2 0x57b49d63617e in fill_source_migration_info\n/home/pm215/qemu/build/arm-clang/../../migration/migration.c:1184:9\n #3 0x57b49d63617e in qmp_query_migrate\n/home/pm215/qemu/build/arm-clang/../../migration/migration.c:1264:5\n #4 0x57b49e4aed75 in qmp_marshal_query_migrate\n/home/pm215/qemu/build/arm-clang/qapi/qapi-commands-migration.c:48:14\n #5 0x57b49e526814 in do_qmp_dispatch_bh\n/home/pm215/qemu/build/arm-clang/../../qapi/qmp-dispatch.c:128:5\n #6 0x57b49e58c35a in aio_bh_call\n/home/pm215/qemu/build/arm-clang/../../util/async.c:173:5\n #7 0x57b49e58c698 in aio_bh_poll\n/home/pm215/qemu/build/arm-clang/../../util/async.c:220:13\n #8 0x57b49e542fc1 in aio_dispatch\n/home/pm215/qemu/build/arm-clang/../../util/aio-posix.c:390:5\n #9 0x57b49e58f10a in aio_ctx_dispatch\n/home/pm215/qemu/build/arm-clang/../../util/async.c:365:5\n #10 0x7c74a09b8584\n(/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5d584) (BuildId:\n116e142b9b52c8a4dfd403e759e71ab8f95d8bb3)\n #11 0x7c74a09b86cf in g_main_context_dispatch\n(/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5d6cf) (BuildId:\n116e142b9b52c8a4dfd403e759e71ab8f95d8bb3)\n #12 0x57b49e5901cb in glib_pollfds_poll\n/home/pm215/qemu/build/arm-clang/../../util/main-loop.c:290:9\n #13 0x57b49e5901cb in os_host_main_loop_wait\n/home/pm215/qemu/build/arm-clang/../../util/main-loop.c:313:5\n #14 0x57b49e5901cb in main_loop_wait\n/home/pm215/qemu/build/arm-clang/../../util/main-loop.c:592:11\n #15 0x57b49d5f5486 in qemu_main_loop\n/home/pm215/qemu/build/arm-clang/../../system/runstate.c:948:9\n #16 0x57b49e42cdfb in qemu_default_main\n/home/pm215/qemu/build/arm-clang/../../system/main.c:50:14\n #17 0x57b49e42cdd3 in main\n/home/pm215/qemu/build/arm-clang/../../system/main.c:93:9\n\n\n> +/* Return expected downtime (unit: milliseconds) */\n> +int64_t migration_downtime_calc_expected(MigrationState *s)\n> +{\n> + if (mig_stats.dirty_sync_count <= 1) {\n> + return migrate_downtime_limit();\n> + }\n> +\n> + return mig_stats.dirty_bytes_last_sync /\n> + migration_get_switchover_bw(s) * 1000;\n> +}\n\nPresumably in this function migration_get_switchover_bw() returns 0,\nso the (floating-point) division results in Infinity. That's fine\nuntil we have to convert it to int64_t to return it, which is the\nUB that the sanitizer is complaining about...\n\nthanks\n-- PMM","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=cQVJnVst;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4gBNMv2LBtz1yKd\n\tfor ; Fri, 08 May 2026 05:58:01 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wL4qq-0006Q1-Fs; 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Thu, 07 May 2026\n 12:57:35 -0700 (PDT)","MIME-Version":"1.0","References":"<20260505202640.1011006-1-peterx@redhat.com>\n <20260505202640.1011006-14-peterx@redhat.com>","In-Reply-To":"<20260505202640.1011006-14-peterx@redhat.com>","From":"Peter Maydell ","Date":"Thu, 7 May 2026 20:57:24 +0100","X-Gm-Features":"AVHnY4IL8knNPEqIHIBPGbX-x-UD5Slw2KmxvdaMJI0ks5ksy-8FQEaEjezO45M","Message-ID":"\n ","Subject":"Re: [PULL 13/23] migration: Calculate expected downtime on demand","To":"Peter Xu ","Cc":"qemu-devel@nongnu.org, Fabiano Rosas ,\n Paolo Bonzini , Juraj Marcin ","Content-Type":"text/plain; charset=\"UTF-8\"","Received-SPF":"pass client-ip=2607:f8b0:4864:20::b12f;\n envelope-from=peter.maydell@linaro.org; helo=mail-yx1-xb12f.google.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, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n 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":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3689387,"web_url":"http://patchwork.ozlabs.org/comment/3689387/","msgid":"","list_archive_url":null,"date":"2026-05-11T13:48:29","subject":"Re: [PULL 13/23] migration: Calculate expected downtime on demand","submitter":{"id":67717,"url":"http://patchwork.ozlabs.org/api/people/67717/","name":"Peter Xu","email":"peterx@redhat.com"},"content":"On Thu, May 07, 2026 at 08:57:24PM +0100, Peter Maydell wrote:\n> On Tue, 5 May 2026 at 21:29, Peter Xu wrote:\n> >\n> > This value does not need to be calculated as frequent. Only calculate it\n> > on demand when query-migrate happened. With that we can remove the\n> > variable in MigrationState.\n> >\n> > This paves way for fixing this value to include all modules (not only RAM\n> > but others too).\n> >\n> > Reviewed-by: Juraj Marcin \n> > Link: https://lore.kernel.org/r/20260421202110.306051-12-peterx@redhat.com\n> > Signed-off-by: Peter Xu \n> \n> Hi; I'm seeing a clang undefined-behaviour sanitizer failure\n> in the code introduced in this change when running the\n> aarch64 migration-test via \"make check\" on an x86-64 host.\n> \n> It seems to happen fairly reliably when I do a \"make check -j20\",\n> but not when I run the test on its own, so it's probably load dependent.\n> \n> Here's the backtrace:\n> \n> ../../migration/migration.c:1051:12: runtime error: inf is outside the\n> range of representable values of type 'long'\n> #0 0x57b49d635c0d in migration_downtime_calc_expected\n> /home/pm215/qemu/build/arm-clang/../../migration/migration.c:1051:12\n> #1 0x57b49d63e860 in populate_time_info\n> /home/pm215/qemu/build/arm-clang/../../migration/migration.c:1075:35\n> #2 0x57b49d63617e in fill_source_migration_info\n> /home/pm215/qemu/build/arm-clang/../../migration/migration.c:1184:9\n> #3 0x57b49d63617e in qmp_query_migrate\n> /home/pm215/qemu/build/arm-clang/../../migration/migration.c:1264:5\n> #4 0x57b49e4aed75 in qmp_marshal_query_migrate\n> /home/pm215/qemu/build/arm-clang/qapi/qapi-commands-migration.c:48:14\n> #5 0x57b49e526814 in do_qmp_dispatch_bh\n> /home/pm215/qemu/build/arm-clang/../../qapi/qmp-dispatch.c:128:5\n> #6 0x57b49e58c35a in aio_bh_call\n> /home/pm215/qemu/build/arm-clang/../../util/async.c:173:5\n> #7 0x57b49e58c698 in aio_bh_poll\n> /home/pm215/qemu/build/arm-clang/../../util/async.c:220:13\n> #8 0x57b49e542fc1 in aio_dispatch\n> /home/pm215/qemu/build/arm-clang/../../util/aio-posix.c:390:5\n> #9 0x57b49e58f10a in aio_ctx_dispatch\n> /home/pm215/qemu/build/arm-clang/../../util/async.c:365:5\n> #10 0x7c74a09b8584\n> (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5d584) (BuildId:\n> 116e142b9b52c8a4dfd403e759e71ab8f95d8bb3)\n> #11 0x7c74a09b86cf in g_main_context_dispatch\n> (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x5d6cf) (BuildId:\n> 116e142b9b52c8a4dfd403e759e71ab8f95d8bb3)\n> #12 0x57b49e5901cb in glib_pollfds_poll\n> /home/pm215/qemu/build/arm-clang/../../util/main-loop.c:290:9\n> #13 0x57b49e5901cb in os_host_main_loop_wait\n> /home/pm215/qemu/build/arm-clang/../../util/main-loop.c:313:5\n> #14 0x57b49e5901cb in main_loop_wait\n> /home/pm215/qemu/build/arm-clang/../../util/main-loop.c:592:11\n> #15 0x57b49d5f5486 in qemu_main_loop\n> /home/pm215/qemu/build/arm-clang/../../system/runstate.c:948:9\n> #16 0x57b49e42cdfb in qemu_default_main\n> /home/pm215/qemu/build/arm-clang/../../system/main.c:50:14\n> #17 0x57b49e42cdd3 in main\n> /home/pm215/qemu/build/arm-clang/../../system/main.c:93:9\n> \n> \n> > +/* Return expected downtime (unit: milliseconds) */\n> > +int64_t migration_downtime_calc_expected(MigrationState *s)\n> > +{\n> > + if (mig_stats.dirty_sync_count <= 1) {\n> > + return migrate_downtime_limit();\n> > + }\n> > +\n> > + return mig_stats.dirty_bytes_last_sync /\n> > + migration_get_switchover_bw(s) * 1000;\n> > +}\n> \n> Presumably in this function migration_get_switchover_bw() returns 0,\n> so the (floating-point) division results in Infinity. That's fine\n> until we have to convert it to int64_t to return it, which is the\n> UB that the sanitizer is complaining about...\n\nTrue, I can easily reproduce the warning too. I'll send a patch.\n\nThanks,","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=SVOWsmOY;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=OFqO/HYJ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4gDh0h4KSRz1yHW\n\tfor ; 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