Red Hat Bugzilla – Bug 495511
kernel panic - not syncing: IO-APIC + timer does not work boot with apic=debug
Last modified: 2009-04-30 10:19:32 EDT
Description of problem:
There was a kernel panic and below is the message which i could see on the server.
"kernel panic - not syncing: IO-APIC + timer does not work boot with apic=debug"
Version-Release number of selected component (if applicable):
Red Hat Enterprise Linux AS release 4 (Nahant Update 4)
Can some one help me what can be the fix.
Please refer attached screen shot for kerel panic
Setting proper component -- kernel panics generally need to be filed against the kernel, not kernel-utils.
First suggestion for working towards a resolution: try a newer Red Hat Enterprise Linux 4 kernel, update 4 is quite old at this point in time -- update 8 is currently in beta -- so its entirely possible this is something that has already been fixed.
And server is the Virtual Machine running under VMware ESX.
Thanks for your response.
WIll you be able to tell me in which RHEL-4 update,this bug is fixed ?
and do you think there is a problem with the way the BIOS has set up IRQ routing (be referring kernel panic screenshot.)
(In reply to comment #4)
> Hello JWilson,
> Thanks for your response.
> WIll you be able to tell me in which RHEL-4 update,this bug is fixed ?
Please grab the latest kernel rpm from
I can fetch the latest kernel RPM but would like what is causing the panic.
Hi Amitabh, you've only included a single generic sentence from the panic. The panic could be caused by any number of issues.
First, however, let's see if the panic still occurs with the latest kernel. If it works then we'll see if we can determine what patch has resolved your problem. If it doesn't work then I'll have to get more information from you.