Re: Unexpected IO-APIC

On Tue, 24 Feb 2004 12:03:58 -0600 Lyle Worthington wrote:

| We rolled back to this kernel after having multiple problems with the 
| newer 2.6 kernels.  This is the only kernel that has worked for us 
| consistently.  It is on 70 or so other servers and runs without any 
| problems.
| 
| I dont see this message on any of our P3 systems - only the systems that 
| have the P4s.  It's refreshing to know that this is not the cause of the 

Yes, the P4s have a different chipset, which is where the IO-APIC is.

| crashes - however the issue still remains that this one system is freezing 
| and there is no information in any of the log files, nor is there any 
| output to the screen when the system does freeze.
| 
| The times of the crashes arent the same - fsck completes with no problems, 
| and the only message I see in /var/log/messages is "restart" - never any 
| errors.  Im stuck on what to do next...
| 
| Thanks again for your help - and can you please CC me on any reply - i 
| dont subscribe to linux-smp.

Have you considered using a kernel debugger or crash dump (lkcd)?
Or have you tried logging /proc/meminfo and 'vmstat' output every 5
seconds or so to see if they record any useful info?


| On Tue, 24 Feb 2004 08:38:05 -0800, Randy.Dunlap <[email protected]> wrote:
| 
| > On Tue, 24 Feb 2004 09:07:21 -0600 Lyle Worthington wrote:
| >
| > | I am running RedHat 7.3 on a dual P4 3.2G Xeons with 6G RAM and linux
| > | kernel 2.4.18-19.7.xbigmem.  This sytem is the only one report this
| > | IO-APIC issue and has crashed 4 times in the past 6 days.  I have 
| > searched
| > | all over the web trying to find replies to messages people have sent in
| > | regarding this issue but have found none so I am emailing hoping you 
| > can
| > | help.  Here is the output from dmesg, let me know if you need any more
| > | information:
| > |
| > | IO APIC #2......
| > | .... register #00: 02008000
| > | .......    : physical APIC id: 02
| > |   WARNING: unexpected IO-APIC, please mail
| > |            to [email protected]
| > | .... register #01: 00178020
| > | .......     : max redirection entries: 0017
| > | .......     : PRQ implemented: 1
| > | .......     : IO APIC version: 0020
| > | .... register #02: 00000000
| > | .......     : arbitration: 00
| > | .... IRQ redirection table:
| >
| > Hi,
| > The problems that you are seeing aren't likely to have anything to do
| > with the unexpected IO-APIC warning message.  In fact, that message
| > has been removed in the 2.6.x kernels.
| >
| > Is there a more recent kernel that you can use?  Just wondering since
| > I don't know about RH updates.
| >
| > --
| > ~Randy


--
~Randy