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"PAM unable to resolve symbol"



Good morning,
one of my systems sporadically log the following error messages:

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PAM unable to resolve symbol: pam_sm_open_session
PAM unable to resolve symbol: pam_sm_close_session
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The problem is not reproducable yet, since I do not know what could be going wrong.
The whole context in /var/log/auth looks like following:
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Mar 25 06:45:21 Atlas sudo: zabbix : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/sbin/smartctl -a /dev/sdf Mar 25 06:45:21 Atlas sudo: pam_unix(sudo:session): session opened for user root by (uid=103) Mar 25 06:45:21 Atlas sudo: pam_unix(sudo:session): session closed for user root Mar 25 06:45:26 Atlas auth: PAM unable to resolve symbol: pam_sm_open_session Mar 25 06:45:26 Atlas auth: PAM unable to resolve symbol: pam_sm_close_session Mar 25 06:45:26 Atlas auth: PAM unable to resolve symbol: pam_sm_open_session Mar 25 06:45:26 Atlas auth: PAM unable to resolve symbol: pam_sm_close_session Mar 25 06:45:26 Atlas auth: PAM unable to resolve symbol: pam_sm_open_session Mar 25 06:45:26 Atlas auth: PAM unable to resolve symbol: pam_sm_close_session Mar 25 06:45:28 Atlas auth: PAM unable to resolve symbol: pam_sm_open_session Mar 25 06:45:28 Atlas auth: PAM unable to resolve symbol: pam_sm_close_session Mar 25 06:45:29 Atlas auth: PAM unable to resolve symbol: pam_sm_open_session Mar 25 06:45:29 Atlas auth: PAM unable to resolve symbol: pam_sm_close_session Mar 25 06:45:29 Atlas auth: PAM unable to resolve symbol: pam_sm_open_session Mar 25 06:45:29 Atlas auth: PAM unable to resolve symbol: pam_sm_close_session Mar 25 06:45:29 Atlas auth: PAM unable to resolve symbol: pam_sm_open_session Mar 25 06:45:29 Atlas auth: PAM unable to resolve symbol: pam_sm_close_session Mar 25 06:45:38 Atlas sshd[26057]: SSH: Server;Ltype: Version;Remote: 10.0.0.2-57912;Protocol: 2.0;Client: zabbix_agent Mar 25 06:45:40 Atlas sudo: zabbix : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/usr/sbin/iptstate -1 Mar 25 06:45:40 Atlas sudo: pam_unix(sudo:session): session opened for user root by (uid=103) Mar 25 06:45:40 Atlas sudo: pam_unix(sudo:session): session closed for user root
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These entries occur at different times, so I can not recognize a pattern or a system or something like that. Sometimes the error occurs a few times during a few hours, sometimes everything works well for 10 hours.

I use a hardened Gentoo Linux with kernel 3.0.4-r1, pambase-20101024-r2 and pam-1.1.5. Of course I reinstalled these packets and all their dependencies, but this had no effect at all.

Any help would be really appreciated.

Best regards,
Yann


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