| Message ID | 20240125194840.1564-2-iii@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | make vm-build-freebsd fixes | expand |
On 25/01/2024 20.48, Ilya Leoshkevich wrote: > 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. > > Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> > --- > 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 > @@ -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_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) Reviewed-by: Thomas Huth <thuth@redhat.com>
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 @@ -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_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)
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. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> --- tests/vm/basevm.py | 2 ++ 1 file changed, 2 insertions(+)