CentOS - Aug 2006 - problem with rebootning on recen centos kernels

hi friends,

maybe you could help me with following problem: We have one SuperMicro dual
xenon machine running Centos 4.3 ia32 version and we have problem with
reboting this machine remotely (command reboot from ssh connection). After
upgrade to kernel versions 2.6.9-42.0.2.ELsmp and 2.6.9-34.0.2.ELsmp the
machine hangs right after the:

md: md0 switched to read-only mode.

message and does not reboot. Other systems says at this moment something
like "Rebooting ..." and do reboot. With kernel version
2.6.9-34.0.1.ELsmp
and older everything is ok, so that there must be some change in
2.6.9-34.0.2.ELsmp and later.

I have tried to boot with reboot=bios, reboot=force, reboot=triple, acpi=off
- unfortunately with no success.

Does anybody seen od solved this issue?

Dan

> like "Rebooting ..." and do reboot. With kernel version
2.6.9-34.0.1.ELsmp
> and older everything is ok, so that there must be some change in
> 2.6.9-34.0.2.ELsmp and later.
> 
> I have tried to boot with reboot=bios, reboot=force, reboot=triple,
acpi=off
> - unfortunately with no success.
> 
> Does anybody seen od solved this issue?
Yes, seen it. I gave up on that and switched the mobo. But there is also some 
changes in ACPI in recent times that have given other problems with loading PCI 
adapter drivers. But as you say, you see the same problem even with acpi=off -- 
as I did when I had the problem. It is hard to say that is is a bug in the 
kernel or not. ACPI is messy and it could just as easily be a BIOS issue on the 
mobo. Have you checked if there are any BIOS updates for your motherboard? It 
might solve your problem, or it might not. But worth a try.

-- 

//Morten Torstensen
//Email: morten at mortent.org
//IM: Cartoon at jabber.no morten.torstensen at gmail.com

And if it turns out that there is a God, I don't believe that he is evil.
The worst that can be said is that he's an underachiever.