ldap: ping does not return

Herbert Gasiorowski gasi3 at web.de
Thu May 6 13:09:09 UTC 2004


 From "Re: Latest FC kernel still have SMP bugs?"

Nigel Wade wrote:
> Herbert Gasiorowski wrote:
> 
>> Nigel Wade wrote:
>>
>>> Herbert Gasiorowski wrote:
>>>
>>>>> I've built the RHEL3 kernel on FC1 and run the system up using 
>>>>> this. Ordinary ldap requests seem quite happy, but I'm still seeing 
>>>>> the futex lock problem with nss_ldap. E.g. when I add 'hosts: files 
>>>>> ldap dns' to /etc/nsswitch.conf I get:
>>>>>
>>>>> # strace ping host
>>>>> munmap(0xb75ff000, 4096)                = 0
>>>>> uname({sys="Linux", node="hostname", ...}) = 0
>>>>> futex(0x53e4ec, FUTEX_WAIT, 2, NULL
>>>>>
>>>>> Setting LD_ASSUME_KERNEL=2.4.1 cures this particular problem, but 
>>>>> isn't a solution for a system relying on LDAP for all 
>>>>> authentication and NSS functions.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> The problem remains in FC2 (Test 3) with the 2.6 kernel!
>>>>
>>>> LD_ASSUME_KERNEL=2.4.1 seems to cure at least "ping host"
>>>>
>>>>
>>>
>>> This is in some way related to nscd.
>>>
>>> If nscd isn't running hosts don't resolve using LDAP. AFAIK, nscd 
>>> should not be compulsory.
>>>
>>
>> Thanks, this seems to solve my problem and finally I managed to 
>> install nscd!
>>
> 
> I do this, but I have to say I don't like it. It's very precarious - if 
> nscd hangs or crashes for some reason the m/c is unusable. You can't 
> even login as root at the console to fix nscd if host resolution is 
> hanging. Eventually pretty much everything hangs.

Actually it does not solve my problem: I need to use "hosts: files ldap dns"
in nsswitch.conf, but then again ping never returns and nscd crashes.
(It only works with "hosts: files dns ldap" and nscd)

-- 
mfg
Herbert Gasiorowski
http://www.mathematik.uni-marburg.de/~gasi/





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