[CentOS] centos.plus kernels

Tue Feb 24 16:10:02 UTC 2009
Rob Kampen <rkampen at kampensonline.com>

Alain Terriault wrote:
> hi,
>
> I experienced 3 problems that i am 99% sure related to kernel-2.6.18-92.1.22.el5.centos.plus.x86_64.rpm <http://mirror.centos.org/centos/5.2/centosplus/x86_64/RPMS/kernel-2.6.18-92.1.22.el5.centos.plus.x86_64.rpm>
>
> #1 on a nfs server
> problem : constantly appearing on all my machines "lockd: server 192.168.10.2 not responding, 
> timed out"
>
> solution : move to kernel-2.6.18-92.1.22.el5, never saw that message again. 
>   
I run a CentOS  2.6.18-92.1.22.el5 #1 SMP Tue Dec 16 11:57:43 EST 2008 
x86_64 x86_64 x86_64 GNU/Linux kernel serving NFS with no issues. I have 
a number of CentOS 2.6.18-92.1.22.el5.centos.plus #1 SMP Wed Dec 17 
10:49:19 EST 2008 x86_64 x86_64 x86_64 GNU/Linux workstations that have 
no issues as NFS clients. No experience of plus kernel used on servers.
> #2 on the same nfs server
> problem : it is a important server for our department, so i rarely do a "shutdown". 
> when i moved to kernel-2.6.18-92.1.22.el5 the "/sbin/shutdown -h now" did not succeed, i had to press the power button to shut it down.
> the only thing that was on the screen, after 10 minutes, was a usb messages, i could unplug my usb keyboard and the kernel would notify
> me of the changes, it seem that it was not totally frozen. 
> everything boot up properly, after the power cycle, so i assume all the files where close properly.
> i only had this problem on this nfs server, other machines with the same kernel never had this shutdown problem.
>
> solution : move to kernel-2.6.18-92.1.22.el5, did power cycle test and all went just fine. 
>
>
> #3 on a vmware virtual machine
> problem :
> Feb 15 18:55:41 www kernel: nscd[5631]: segfault at 00002b89938405c0 rip 00002b891f30f7c5 rsp  00000000411256d0 error 4
> Feb 16 14:39:40 www nscd: 5642 invalid persistent database file "/var/db/nscd/passwd": verification failed
> Feb 16 17:11:53 www kernel: nscd[5653]: segfault at 0000000040f9b000 rip 00002af497e3e4d4 rsp  0000000040f96050 error 6
> Feb 17 09:44:37 www nscd: 5639 invalid persistent database file "/var/db/nscd/hosts": verification failed
> Feb 19 03:09:09 www kernel: nscd[5830]: segfault at 00002baab9b653cc rip 00002ba9afe3b7a6 rsp  0000000041ec96d0 error 4
>
> for ldap accounts login was still possible, some of the directories became unaccessible and other directories where working just fine. 
>
> rebooting nscd temporary fixed the problem for ~12-24 hours, same for a system reboot.
> i did not push my investigation further, after my problems with nfs lock i instantly switch to kernel-2.6.18-92.1.22.el5
>
>
> solution : move to kernel-2.6.18-92.1.22.el5, never saw that message again.
>
>
> I did not take that many notes or investigate that much, so i can not tell you much more. but i will do my best to reply to direct emails.
> I am also not in a position to reproduce those problems.
> I sent this post because i am concern they may be serious bugs in the centos.plus kernels. 
>
> other than that, i am old centos fan, using it on terabytes of data and this is the first time i hit such a problem.
>   
Yeah - me too, just love the stability
> cheers,
> alain
>
>
>
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>   
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