[Bug 476069] Re: segfault

[Russ Allbery]

Alex Mauer <hawke at hawkesnest.net> writes:

> I assigned this bug to this package because the segfault appears as
> follows (from dmesg):

> [ 1844.309499] su[6070]: segfault at 1be96c38 ip 00007fd3a48c03c3 sp
> 00007fffd10ab710 error 4 in libkrb5.so.3.3[7fd3a4874000+ae000]

> Turning on debug in the krb5 pam system provides the following in
> auth.log:

> Nov  5 20:07:24 computer su[6070]: (pam_krb5): none: pam_sm_authenticate: entry (0x0)
> Nov  5 20:07:24 computer su[6070]: (pam_krb5): user: attempting authentication as user at KRB.DOMAIN
> Nov  5 20:07:27 computer su[6070]: (pam_krb5): user: pam_sm_authenticate: exit (success)
> Nov  5 20:07:27 computer su[6070]: (pam_krb5): user: cannot retrieve principal from cache: Credentials cache permissions incorrect
> Nov  5 20:07:27 computer su[6070]: pam_acct_mgmt: Authentication failure

That log trace seems to indicate that (a) you have some sort of serious
problem with either your PAM or your nsswitch configuration causing a
ticket cache that was just created in the authentication stage to no
longer have correct ownership in the account stage, and (b) the segfault
isn't occuring in the PAM module, since that last line is the final line
logged by the PAM module before returning to the process.

-- 
Russ Allbery (rra at debian.org)               <http://www.eyrie.org/~eagle/>

-- 
segfault
https://bugs.launchpad.net/bugs/476069
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