From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4ECAFC433E0 for ; Mon, 15 Jun 2020 15:22:43 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 034972071A for ; Mon, 15 Jun 2020 15:22:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="HeTbA6S1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 034972071A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:57538 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jkqwc-00050T-AU for qemu-devel@archiver.kernel.org; Mon, 15 Jun 2020 11:22:42 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40902) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jkqvY-0004R3-Ql for qemu-devel@nongnu.org; Mon, 15 Jun 2020 11:21:38 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:34150 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jkqvV-0001Lc-UQ for qemu-devel@nongnu.org; Mon, 15 Jun 2020 11:21:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1592234492; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=QAYcMIdlpKYRcCFJ3E4XoEuFViJAabEGp87+PRpfBNQ=; b=HeTbA6S1W2I/F1NTf4WwD5jLOLcPYM1rfXokNQCpnJSrpsg5PVLpH7LlzkFcIGBjLMtBGF wh2t65Gtqhkw3yTiyNG74NN9MjgWNlityL1NBxVrV3X4Dru8gBDlWYOHdQtC9aLdpxapZk vS4UQ8/lI5yZSuHaMbhxCXSkBdhGMiI= Received: from mail-ej1-f72.google.com (mail-ej1-f72.google.com [209.85.218.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-197-mitnfHCwN_eneBS40trmZA-1; Mon, 15 Jun 2020 11:21:22 -0400 X-MC-Unique: mitnfHCwN_eneBS40trmZA-1 Received: by mail-ej1-f72.google.com with SMTP id hj12so7955378ejb.13 for ; Mon, 15 Jun 2020 08:21:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=QAYcMIdlpKYRcCFJ3E4XoEuFViJAabEGp87+PRpfBNQ=; b=BhE+sTYLyaBZs5qiNMpPDcyMkbrRuEJN3eWkOlSI8n3SB+tlUTTt5WEL3uHtVrWwfa zzVdJuieoKG+RK9tVCT+neHbyCSr2Q6CPRlIt0suw3n9S2ujV4Q/gJAv9KUb5G8Dmml1 ffWfQa5fWP4wzlAtoQLNhv2Jb3GGz7YFyrkQQ2qL3as6olHulGWpgDB/eYBMJEOw764x 080HD25OP3VWTs3QJsDBHJa99rXJN/x0VYnWdMmCb4HLAE2s7kEMJnu4Xex5o6UOxDa+ 7jiFu4531hQF+wQpNdA7CUgZ2kWWNeJGLlMEvvCYqJ/G/NtWwz52wMZJHBW02uSNPred +0PQ== X-Gm-Message-State: AOAM531/CozEjvahKRtH1izmVtM84dxSprmSqIHkfxBTZbre2zlL3Iko aZgTQJc+pTr9cD9AsWS3Rr4mFMpTKPv4/47gniYR4Czp27bK3WLm1B2ELdf54Q95tShVxubTswC WHwt05KzgYlUpsaA= X-Received: by 2002:a17:906:fc13:: with SMTP id ov19mr25609492ejb.212.1592234480881; Mon, 15 Jun 2020 08:21:20 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwRXgs4jzrFDRbiNvMcb7rNBvXmNyXLlD4Mk/7N/u0WjmY8DzmGLnsj6McOby16otrQL8bXgA== X-Received: by 2002:a17:906:fc13:: with SMTP id ov19mr25609464ejb.212.1592234480557; Mon, 15 Jun 2020 08:21:20 -0700 (PDT) Received: from [192.168.1.38] (181.red-88-10-103.dynamicip.rima-tde.net. [88.10.103.181]) by smtp.gmail.com with ESMTPSA id f1sm8460892edn.66.2020.06.15.08.21.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 15 Jun 2020 08:21:20 -0700 (PDT) Subject: Re: [PATCH v3 0/3] python/machine.py: refactor shutdown To: John Snow , qemu-devel@nongnu.org, Cleber Rosa References: <20200604195252.20739-1-jsnow@redhat.com> <8bd27ec8-1bb6-45e2-a43a-7e0229065414@redhat.com> <4012de28-5837-889a-eda1-b9957cbbbad1@redhat.com> From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Autocrypt: addr=philmd@redhat.com; keydata= mQINBDXML8YBEADXCtUkDBKQvNsQA7sDpw6YLE/1tKHwm24A1au9Hfy/OFmkpzo+MD+dYc+7 bvnqWAeGweq2SDq8zbzFZ1gJBd6+e5v1a/UrTxvwBk51yEkadrpRbi+r2bDpTJwXc/uEtYAB GvsTZMtiQVA4kRID1KCdgLa3zztPLCj5H1VZhqZsiGvXa/nMIlhvacRXdbgllPPJ72cLUkXf z1Zu4AkEKpccZaJspmLWGSzGu6UTZ7UfVeR2Hcc2KI9oZB1qthmZ1+PZyGZ/Dy+z+zklC0xl XIpQPmnfy9+/1hj1LzJ+pe3HzEodtlVA+rdttSvA6nmHKIt8Ul6b/h1DFTmUT1lN1WbAGxmg CH1O26cz5nTrzdjoqC/b8PpZiT0kO5MKKgiu5S4PRIxW2+RA4H9nq7nztNZ1Y39bDpzwE5Sp bDHzd5owmLxMLZAINtCtQuRbSOcMjZlg4zohA9TQP9krGIk+qTR+H4CV22sWldSkVtsoTaA2 qNeSJhfHQY0TyQvFbqRsSNIe2gTDzzEQ8itsmdHHE/yzhcCVvlUzXhAT6pIN0OT+cdsTTfif MIcDboys92auTuJ7U+4jWF1+WUaJ8gDL69ThAsu7mGDBbm80P3vvUZ4fQM14NkxOnuGRrJxO qjWNJ2ZUxgyHAh5TCxMLKWZoL5hpnvx3dF3Ti9HW2dsUUWICSQARAQABtDJQaGlsaXBwZSBN YXRoaWV1LURhdWTDqSAoUGhpbCkgPHBoaWxtZEByZWRoYXQuY29tPokCVQQTAQgAPwIbDwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4AWIQSJweePYB7obIZ0lcuio/1u3q3A3gUCXsfWwAUJ KtymWgAKCRCio/1u3q3A3ircD/9Vjh3aFNJ3uF3hddeoFg1H038wZr/xi8/rX27M1Vj2j9VH 0B8Olp4KUQw/hyO6kUxqkoojmzRpmzvlpZ0cUiZJo2bQIWnvScyHxFCv33kHe+YEIqoJlaQc JfKYlbCoubz+02E2A6bFD9+BvCY0LBbEj5POwyKGiDMjHKCGuzSuDRbCn0Mz4kCa7nFMF5Jv piC+JemRdiBd6102ThqgIsyGEBXuf1sy0QIVyXgaqr9O2b/0VoXpQId7yY7OJuYYxs7kQoXI 6WzSMpmuXGkmfxOgbc/L6YbzB0JOriX0iRClxu4dEUg8Bs2pNnr6huY2Ft+qb41RzCJvvMyu gS32LfN0bTZ6Qm2A8ayMtUQgnwZDSO23OKgQWZVglGliY3ezHZ6lVwC24Vjkmq/2yBSLakZE 6DZUjZzCW1nvtRK05ebyK6tofRsx8xB8pL/kcBb9nCuh70aLR+5cmE41X4O+MVJbwfP5s/RW 9BFSL3qgXuXso/3XuWTQjJJGgKhB6xXjMmb1J4q/h5IuVV4juv1Fem9sfmyrh+Wi5V1IzKI7 RPJ3KVb937eBgSENk53P0gUorwzUcO+ASEo3Z1cBKkJSPigDbeEjVfXQMzNt0oDRzpQqH2vp apo2jHnidWt8BsckuWZpxcZ9+/9obQ55DyVQHGiTN39hkETy3Emdnz1JVHTU0Q== Message-ID: <5d20012b-923c-0bf4-232d-272977087fe3@redhat.com> Date: Mon, 15 Jun 2020 17:21:18 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <4012de28-5837-889a-eda1-b9957cbbbad1@redhat.com> Content-Language: en-US X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=207.211.31.120; envelope-from=philmd@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/15 01:17:36 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, WEIRD_PORT=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, Eduardo Habkost , Markus Armbruster Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 6/9/20 11:55 PM, John Snow wrote: > > > On 6/9/20 9:08 AM, Philippe Mathieu-Daudé wrote: >> Hi John, >> >> On 6/4/20 9:52 PM, John Snow wrote: >>> v3: >>> - Split _post_shutdown refactor into own patch (now 1/3) >>> - Re-add sigkill warning squelch (now 3/3) >>> >>> NOTE: I re-added the squelch in its own patch for review purposes, but >>> for the purposes of avoiding temporary breakage, a maintainer may wish >>> to squash patches 2 and 3 if they are accepted. >>> >>> v2: Philippe took patches 1, 3 and 4. >>> >>> This is a re-write of what was: >>> [PATCH RFC 03/32] python//machine.py: remove bare except >>> [PATCH 2/4] python/machine.py: remove bare except >>> >>> It's a bit heavier handed, but it should address some of kwolf's >>> feedback from the RFC version. >>> >>> Applies straight to origin/master, ought to pass pylint and flake8: >>> >>>> cd ~/src/qemu/python/qemu >>>> pylint *.py >>>> flake8 *.py >>> >>> John Snow (3): >>> python/machine.py: consolidate _post_shutdown() >>> python/machine.py: refactor shutdown >>> python/machine.py: re-add sigkill warning suppression >>> >>> python/qemu/machine.py | 100 +++++++++++++++++++++++++++++------------ >>> 1 file changed, 71 insertions(+), 29 deletions(-) >>> >> >> I'm now seeing this error: >> >> 21:31:58 DEBUG| / # reboot >> 21:32:01 DEBUG| / # reboot: Restarting system >> 21:32:01 DEBUG| >>> {'execute': 'quit'} >> 21:32:01 WARNI| qemu received signal 9; command: >> "mips-softmmu/qemu-system-mips -display none -vga none -chardev >> socket,id=mon,path=/tmp/tmp679upvrk/qemu-10292-monitor.sock -mon >> chardev=mon,mode=control -machine malta -chardev >> socket,id=console,path=/tmp/tmp679upvrk/qemu-10292-console.sock,server,nowait >> -serial chardev:console -kernel >> /tmp/avocado_b3aaagr9/avocado_job_5bj0xe1h/12-tests_acceptance_boot_linux_console.py_BootLinuxConsole.test_mips_malta_cpio/boot/vmlinux-4.5.0-2-4kc-malta >> -initrd >> /tmp/avocado_b3aaagr9/avocado_job_5bj0xe1h/12-tests_acceptance_boot_linux_console.py_BootLinuxConsole.test_mips_malta_cpiorootfs.cpio >> -append printk.time=0 console=ttyS0 console=tty rdinit=/sbin/init >> noreboot -no-reboot" >> 21:32:01 ERROR| >> 21:32:01 ERROR| Reproduced traceback from: >> /home/travis/build/philmd/qemu/build/tests/venv/lib/python3.6/site-packages/avocado/core/test.py:886 >> 21:32:01 ERROR| Traceback (most recent call last): >> 21:32:01 ERROR| File >> "/home/travis/build/philmd/qemu/build/tests/acceptance/avocado_qemu/__init__.py", >> line 195, in tearDown >> 21:32:01 ERROR| vm.shutdown() >> 21:32:01 ERROR| File >> "/home/travis/build/philmd/qemu/python/qemu/machine.py", line 449, in >> shutdown >> 21:32:01 ERROR| self._do_shutdown(has_quit) >> 21:32:01 ERROR| File >> "/home/travis/build/philmd/qemu/python/qemu/machine.py", line 426, in >> _do_shutdown >> 21:32:01 ERROR| self._soft_shutdown(has_quit, timeout) >> 21:32:01 ERROR| File >> "/home/travis/build/philmd/qemu/python/qemu/machine.py", line 413, in >> _soft_shutdown >> 21:32:01 ERROR| self._qmp.cmd('quit') >> 21:32:01 ERROR| File >> "/home/travis/build/philmd/qemu/python/qemu/qmp.py", line 271, in cmd >> 21:32:01 ERROR| return self.cmd_obj(qmp_cmd) >> 21:32:01 ERROR| File >> "/home/travis/build/philmd/qemu/python/qemu/qmp.py", line 249, in cmd_obj >> 21:32:01 ERROR| self.__sock.sendall(json.dumps(qmp_cmd).encode('utf-8')) >> 21:32:01 ERROR| BrokenPipeError: [Errno 32] Broken pipe >> 21:32:01 ERROR| >> 21:32:01 DEBUG| DATA (filename=output.expected) => NOT FOUND (data >> sources: variant, test, file) >> 21:32:01 DEBUG| DATA (filename=stdout.expected) => NOT FOUND (data >> sources: variant, test, file) >> 21:32:01 DEBUG| DATA (filename=stderr.expected) => NOT FOUND (data >> sources: variant, test, file) >> 21:32:01 DEBUG| Not logging /var/log/syslog (lack of permissions) >> 21:32:01 ERROR| ERROR >> 12-tests/acceptance/boot_linux_console.py:BootLinuxConsole.test_mips_malta_cpio >> -> TestSetupFail: [Errno 32] Broken pipe >> 21:32:01 INFO | >> >> https://travis-ci.org/github/philmd/qemu/jobs/696142277#L5329 >> > > Gotcha. > > The problem here is that `test_mips_malta_cpio` in boot_linux_console.py > does this: > > self.vm.add_args('-kernel', kernel_path, > '-initrd', initrd_path, > '-append', kernel_command_line, > '-no-reboot') > > and then: > > exec_command_and_wait_for_pattern(self, 'reboot', > 'reboot: Restarting system') > > and (in avocado_qemu/) __init__.py does this: > > def tearDown(self): > for vm in self._vms.values(): > vm.shutdown() > > > > What's happening here is that we are instructing QEMU to *close* when > the guest reboots instead of allowing it to reboot. Then, we are issuing > a reboot command to the guest, which will effectively terminate QEMU as > well. Finally, we are trying to send a shutdown command to QEMU, but > QEMU has already gone. > > Now, in the shutdown code, we do make an attempt to catch this: > > def is_running(self): > """Returns true if the VM is running.""" > return self._popen is not None and self._popen.poll() is None > > But, well, race conditions. > > When we make it here: > > if self._qmp is not None: > if not has_quit: > self._qmp.cmd('quit') > self._qmp.close() > > We believe we are running and we believe we have an open QMP socket. > Attempting to engage the socket by sending 'quit' causes the error. > > It's a tight window: if quit happens earlier, we send the command > successfully and everything's OK. If quit happens later, we realize QEMU > isn't running and proceed to cleanup. Nice debugging :) > > Ultimately: > > - Avocado should not try to shut down QEMU twice, but > - machine.py shouldn't enable the race condition either. > > > > for my part, how about this: > > diff --git a/python/qemu/machine.py b/python/qemu/machine.py > index 99bcb499878..813f8e477db 100644 > --- a/python/qemu/machine.py > +++ b/python/qemu/machine.py > @@ -385,7 +385,14 @@ def _soft_shutdown(self, has_quit: bool = False, > timeout: int = 3) -> None: > > if self._qmp is not None: > if not has_quit: > - self._qmp.cmd('quit') > + try: > + self._qmp.cmd('quit') > + except (BrokenPipeError, ConnectionResetError): > + # QMP went away just before or just after sending > 'quit' > + if not self.is_running(): > + # "Mission Accomplished" > + pass > + raise Looks OK to me, Cleber/Eduardo can you Ack? > self._qmp.close() > > self._popen.wait(timeout=timeout) >