[Haifux] Login console freezes: Eli's weekly riddle

[guy keren]

why not strace sshd and find what it's doing?

log into the machine, then run a separate sshd under an alternate port , 
and under 'strace -f -o <file> ....-tt -T', then see what strace shows 
you it is doing, and which operations are taking a long time (-tt gives 
a timestamp for each syscall invocation, -T gives the time a syscall 
invocation took to complete).

--guy


Eli Billauer wrote:
> Hi,
> 
> 
> PAM did indeed cross my mind as a suspect. Unfortunately, I have no 
> /var/log/auth* logfiles. As a matter of fact, I don't have any log 
> messages related to authentication. In my very old Redhat 7.3, I had 
> pam_unix messages in /var/log/messages telling me who has changed user 
> ID. On Fedora 12, nothing is mentioned about becoming root in 
> /var/log/messages, and I can't see any directory or file in /var/log 
> that seems to contain that information. Maybe under the audit directory, 
> but the files there are not really human readable.
> 
> 
> Any idea of where my authenticate mechanism keeps its logs?
> 
> 
> And why a kernel upgrade would have any effect?
> 
> 
> <rant>In the past, I clearly recall just upgrading my kernel and all was 
> fine. Where are those days?</rant>
> 
> 
> Thanks,
> 
>    Eli
> 
> 
> Shachar Shemesh wrote:
> 
>>>  
>> If both ssh and the graphical logins are slow, I would suspect PAM. 
>> Try ssh public key authentication and see what happens (I think that 
>> one bypasses pam). Also, see what /var/log/auth* have to say.
>>
>> Shachar
>>
> 
>