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| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2024-02-06 01:22:00 +0100 |
|---|---|---|
| committer | Thomas Huth <thuth@redhat.com> | 2024-02-06 10:27:50 +0100 |
| commit | 7f0bf5ea415d7108bebda2013ab782d4ccaaba9d (patch) | |
| tree | 1ece8704d6915cff3545b7e7e43668469dc68938 | |
| parent | d0143fa9ee5632900ddc6f03c36c46845d48af18 (diff) | |
| download | qemu-7f0bf5ea415d7108bebda2013ab782d4ccaaba9d.zip qemu-7f0bf5ea415d7108bebda2013ab782d4ccaaba9d.tar.gz qemu-7f0bf5ea415d7108bebda2013ab782d4ccaaba9d.tar.bz2 | |
tests/vm: Set UseDNS=no in the sshd configuration
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 <thuth@redhat.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20240206002344.12372-2-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
| -rw-r--r-- | tests/vm/basevm.py | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tests/vm/basevm.py b/tests/vm/basevm.py index 61725b8..c0d62c0 100644 --- a/tests/vm/basevm.py +++ b/tests/vm/basevm.py @@ -423,6 +423,8 @@ class BaseVM(object): 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) |