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bh=YmWZzs/rQnAiToVTHfV0BRlpDmEgrJ+WRDl06zUpskQ=; b=Ulj+Sm42QWuJ2RpMKKoeYQ7TG0fkFB0edZlNe311c4jrnIYpxxrTbLWBpLDaFyiKA5pwPg zWzZyi6td6e15Q0A+Js8b9/OmYZMh+hoOUM13gAuOb0vGxAPgiOuE9Th01gnCXmHP4mCRO af9BCvTOs843UddVAU8IkKyPiRaJ4+8= X-MC-Unique: lmA0JYzfOjWWlP7hKPxuSA-1 From: Thomas Huth To: qemu-devel@nongnu.org Cc: Peter Maydell , Ilya Leoshkevich Subject: [PULL 09/12] tests/vm: Set UseDNS=no in the sshd configuration Date: Tue, 6 Feb 2024 11:43:44 +0100 Message-ID: <20240206104347.238825-10-thuth@redhat.com> In-Reply-To: <20240206104347.238825-1-thuth@redhat.com> References: <20240206104347.238825-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.10 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; 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: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.285, 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_H2=-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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1707216326869100003 Content-Type: text/plain; charset="utf-8" From: Ilya Leoshkevich 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) =3D 21 13:59:30 getpid() =3D 252655 13:59:30 poll([{fd=3D3, events=3DPOLLIN}], 1, 5000) =3D 1 ([{fd=3D3, re= vents=3DPOLLIN}]) 13:59:32 read(3, "S", 1) =3D 1 13:59:32 poll([{fd=3D3, events=3DPOLLIN}], 1, 3625) =3D 1 ([{fd=3D3, re= vents=3DPOLLIN}]) 13:59:32 read(3, "S", 1) =3D 1 13:59:32 poll([{fd=3D3, events=3DPOLLIN}], 1, 3625) =3D 1 ([{fd=3D3, re= vents=3DPOLLIN}]) 13:59:32 read(3, "H", 1) =3D 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) =3D 5 (0x5) 888: 27.811765030 connect(5,{ AF_INET 10.0.2.3:53 },16) =3D 0 (0x0) 888: 27.812166941 sendto(5,"\^Z/\^A\0\0\^A\0\0\0\0\0\0\^A2"...,39,0,NUL= L,0) =3D 39 (0x27) 888: 29.363970743 poll({ 5/POLLRDNORM },1,5000) =3D 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 Message-ID: <20240206002344.12372-2-iii@linux.ibm.com> Signed-off-by: Thomas Huth --- tests/vm/basevm.py | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py index 61725b8325..c0d62c0803 100644 --- a/tests/vm/basevm.py +++ b/tests/vm/basevm.py @@ -423,6 +423,8 @@ def console_ssh_init(self, prompt, user, pw): def console_sshd_config(self, prompt): self.console_wait(prompt) self.console_send("echo 'PermitRootLogin yes' >> /etc/ssh/sshd_con= fig\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) --=20 2.43.0