Latest FC kernel still have SMP bugs?

[Nigel Wade]

Nigel Wade wrote:
> Norman Gaywood wrote:
> 
>> On Fri, Apr 02, 2004 at 11:31:06AM +0100, Nigel Wade wrote:
>>
>>> I guess I'm back to square one. The system won't operate in SMP with 
>>> the FC kernel and won't operate at all without a FC kernel. So it 
>>> looks like Fedora is snafu'd.
>>>
>>> Unfortunately, RH9/RHEL3 don't have the version of LDAP I require, 
>>> and when I tried an upgrade to openldap I started getting FUTEX 
>>> locking problems.
>>
>>
>>
>> Install the RHEL3 kernel on FC1. I installed:
>>
>> kernel-smp-2.4.21-9.0.1.EL
>> kernel-smp-unsupported-2.4.21-9.0.1.EL
>>
>> from mirror.physics.ncsu.edu:/pub/whitebox/3.0/en/updates/i686
>>
> 
> Thanks, that's an interesting suggestion. I really don't want to install 
> RPMS from an unknown source, but I'll have a go at building my own.
> 

Ok, the bottom line is that this doesn't work either.

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.

-- 
Nigel Wade, System Administrator, Space Plasma Physics Group,
             University of Leicester, Leicester, LE1 7RH, UK
E-mail :    nmw at ion.le.ac.uk
Phone :     +44 (0)116 2523548, Fax : +44 (0)116 2523555