Description of problem: sshd segfaults - all connection attempts fail Apr 26 11:44:38 ontap kernel: sshd[12592]: segfault at 0000000000000038 rip 00002aaaabf38803 rsp 00007fff96cbc760 error 4 Version-Release number of selected component (if applicable): glibc-2.4.90-1 How reproducible: 100% Steps to Reproduce: 1.ssh -v localhost 2. 3. Actual results: OpenSSH_4.3p2, OpenSSL 0.9.8a 11 Oct 2005 debug1: Reading configuration data /home/ellson/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to localhost [127.0.0.1] port 22. debug1: Connection established. debug1: identity file /home/ellson/.ssh/identity type -1 debug1: identity file /home/ellson/.ssh/id_rsa type -1 debug1: identity file /home/ellson/.ssh/id_dsa type 2 debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3 debug1: match: OpenSSH_4.3 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_4.3 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-cbc hmac-md5 none debug1: kex: client->server aes128-cbc hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'localhost' is known and matches the RSA host key. debug1: Found key in /home/ellson/.ssh/known_hosts:21 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Trying private key: /home/ellson/.ssh/identity debug1: Trying private key: /home/ellson/.ssh/id_rsa debug1: Offering public key: /home/ellson/.ssh/id_dsa debug1: Server accepts key: pkalg ssh-dss blen 433 debug1: read PEM private key done: type DSA debug1: Authentication succeeded (publickey). debug1: channel 0: new [client-session] debug1: Entering interactive session. debug1: Sending environment. debug1: Sending env LC_COLLATE = C debug1: Sending env LANG = en_US.UTF-8 debug1: channel 0: free: client-session, nchannels 1 debug1: fd 2 clearing O_NONBLOCK Connection to localhost closed by remote host. Connection to localhost closed. debug1: Transferred: stdin 0, stdout 0, stderr 81 bytes in 0.0 seconds debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 21182.0 debug1: Exit status -1 And /var/log/messages contains: Apr 26 11:44:38 ontap kernel: sshd[12592]: segfault at 0000000000000038 rip 00002aaaabf38803 rsp 00007fff96cbc760 error 4 Expected results: Additional info: Downgrading to glibc-2.4-5 fixes the problem. Problem is reproducible on i686 and x86_64 machines.
See also Bug #189997
I can confirm that Comment #1 from Bug #189997 works for me too. "Setting "UseDNS no" in sshd_config works around the problem temporarily"
*** This bug has been marked as a duplicate of 190002 ***