[CentOS] kernel message - disabling irq #50

nate centos at linuxpowered.net
Sat Sep 20 14:33:24 UTC 2008


partha chowdhury wrote:

>> Sep 19 13:13:02 station2 kernel: irq 50: nobody cared (try booting
> with the "irqpoll" option)

cat /proc/interrupts and see what it says(post output to the list
if you want).

One thing to try, if something is sharing irq50 with another
device, if that device is an expansion card then try moving
that expansion card to another slot in the system.

For the system I am on for reference:


           CPU0       CPU1       CPU2       CPU3
  0:  349449438   97827289  129150703    1324419    IO-APIC-edge  timer
  4:   22709754          0          0          0    IO-APIC-edge  serial
  8:  572455673   15473535  564615318   27739670    IO-APIC-edge  rtc
  9:          1          0          0          0   IO-APIC-level  acpi
 15:      74017      49259   29528511          0    IO-APIC-edge  ide1
 50:   13430140          0   12041824          0   IO-APIC-level  eth2
 74:    7857068          0          0          0   IO-APIC-level  Intel
82801DB-ICH4
169:  142038093          0          0          0   IO-APIC-level 
uhci_hcd:usb1, nvidia
177:    2719957          0          0          0   IO-APIC-level  uhci_hcd:usb2
185:          0          0          0          0   IO-APIC-level  uhci_hcd:usb3
193:      65184          0    4501500          0   IO-APIC-level 
ehci_hcd:usb4, ohci_hcd:usb7
201:   13311819      94167   14802720     262062   IO-APIC-level  3w-xxxx
209:   19049441     916146   11652498     250590   IO-APIC-level  eth0
217:    1612506          0          0          0   IO-APIC-level  ehci_hcd:usb5
225:    3263237          0          0          0   IO-APIC-level  ohci_hcd:usb6
233:    1810468       3618      29330        424   IO-APIC-level  eth1
NMI:          0          0          0          0
LOC:  577787080  577787079  577787078  577787077
ERR:          0
MIS:          0


Nothing sharing irq 50 on this machine, though irq 169 is being
shared by both my Nvidia video card and a 4-port USB expansion
card.

The kernel source code describes the error as this:

 * If 99,900 of the previous 100,000 interrupts have not been handled
 * then assume that the IRQ is stuck in some manner. Drop a diagnostic
 * and try to turn the IRQ off.
 *
 * (The other 100-of-100,000 interrupts may have been a correctly
 *  functioning device sharing an IRQ with the failing one)


So sounds hardware related. Whether it's the board itself
or an add-in card I'm not sure. If possible remove all
add-in cards that you can to see if the issue goes away.
Also disable all devices in the BIOS that your not using
(secondary IDE ports, serial ports, parallel ports etc), just
to rule those out.

Of the roughly 1200 systems I've run with linux over the
years I never recall encountering this message.

nate



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