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Tue, 6 Feb 2024 00:23:48 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9006520043; Tue, 6 Feb 2024 00:23:47 +0000 (GMT) Received: from heavy.ibm.com (unknown [9.171.57.170]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 6 Feb 2024 00:23:47 +0000 (GMT) From: Ilya Leoshkevich To: Paolo Bonzini , =?utf-8?q?Alex_Benn=C3=A9e?= , Ed Maste , Li-Wen Hsu , Warner Losh Cc: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Thomas Huth , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Wainer dos Santos Moschetta , Beraldo Leal , Kyle Evans , qemu-devel@nongnu.org, Ilya Leoshkevich Subject: [PATCH v3 1/4] tests/vm: Set UseDNS=no in the sshd configuration Date: Tue, 6 Feb 2024 01:22:00 +0100 Message-ID: <20240206002344.12372-2-iii@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240206002344.12372-1-iii@linux.ibm.com> References: <20240206002344.12372-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: WeyJueHIf02_T5wwHJZuz31MOJrrGh3i X-Proofpoint-ORIG-GUID: G4YbgauUn_SGLnoafyLauhsKfJncTkNt X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-05_18,2024-01-31_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 clxscore=1015 mlxscore=0 mlxlogscore=999 spamscore=0 malwarescore=0 adultscore=0 impostorscore=0 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2402060000 Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 make vm-build-freebsd sometimes fails with "Connection timed out during banner exchange". The client strace shows: 13:59:30 write(3, "SSH-2.0-OpenSSH_9.3\r\n", 21) = 21 13:59:30 getpid() = 252655 13:59:30 poll([{fd=3, events=POLLIN}], 1, 5000) = 1 ([{fd=3, revents=POLLIN}]) 13:59:32 read(3, "S", 1) = 1 13:59:32 poll([{fd=3, events=POLLIN}], 1, 3625) = 1 ([{fd=3, revents=POLLIN}]) 13:59:32 read(3, "S", 1) = 1 13:59:32 poll([{fd=3, events=POLLIN}], 1, 3625) = 1 ([{fd=3, revents=POLLIN}]) 13:59:32 read(3, "H", 1) = 1 There is a 2s delay during connection, and ConnectTimeout is set to 1. Raising it makes the issue go away, but we can do better. The server truss shows: 888: 27.811414714 socket(PF_INET,SOCK_DGRAM|SOCK_CLOEXEC,0) = 5 (0x5) 888: 27.811765030 connect(5,{ AF_INET 10.0.2.3:53 },16) = 0 (0x0) 888: 27.812166941 sendto(5,"\^Z/\^A\0\0\^A\0\0\0\0\0\0\^A2"...,39,0,NULL,0) = 39 (0x27) 888: 29.363970743 poll({ 5/POLLRDNORM },1,5000) = 1 (0x1) So the delay is due to a DNS query. Disable DNS queries in the server config. Reviewed-by: Thomas Huth Signed-off-by: Ilya Leoshkevich --- tests/vm/basevm.py | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py index 61725b83254..c0d62c08031 100644 --- a/tests/vm/basevm.py +++ b/tests/vm/basevm.py @@ -406,40 +406,42 @@ def console_send(self, command): vm.console_socket.send(char.encode("utf-8")) time.sleep(0.01) def console_wait_send(self, wait, command): self.console_wait(wait) self.console_send(command) def console_ssh_init(self, prompt, user, pw): sshkey_cmd = "echo '%s' > .ssh/authorized_keys\n" \ % self._config['ssh_pub_key'].rstrip() self.console_wait_send("login:", "%s\n" % user) self.console_wait_send("Password:", "%s\n" % pw) self.console_wait_send(prompt, "mkdir .ssh\n") self.console_wait_send(prompt, sshkey_cmd) self.console_wait_send(prompt, "chmod 755 .ssh\n") self.console_wait_send(prompt, "chmod 644 .ssh/authorized_keys\n") def console_sshd_config(self, prompt): self.console_wait(prompt) self.console_send("echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config\n") + self.console_wait(prompt) + self.console_send("echo 'UseDNS no' >> /etc/ssh/sshd_config\n") for var in self.envvars: self.console_wait(prompt) self.console_send("echo 'AcceptEnv %s' >> /etc/ssh/sshd_config\n" % var) def print_step(self, text): sys.stderr.write("### %s ...\n" % text) def wait_ssh(self, wait_root=False, seconds=300, cmd="exit 0"): # Allow more time for VM to boot under TCG. if not kvm_available(self.arch): seconds *= self.tcg_timeout_multiplier starttime = datetime.datetime.now() endtime = starttime + datetime.timedelta(seconds=seconds) cmd_success = False while datetime.datetime.now() < endtime: if wait_root and self.ssh_root(cmd) == 0: cmd_success = True break elif self.ssh(cmd) == 0: cmd_success = True