Good day,
thank you for your response, please see the answers below.
On 10/17/2012 08:05 PM, Alan Stern wrote:
On Wed, 17 Oct 2012, Martin Vysny wrote:
Good day,
thank you for your mail. I was finally able to reproduce the issue. I
am attaching a dmesg output of a correct boot (please note that there
still are several unwanted IRQs), and a dmesg output of a reproduced error.
Did you boot with the "irqpoll" option? Judging by the log, it looks
like you did.
Nope, I didn't boot with the irqpoll boot option enabled:
$ cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-3.5.0-17-generic
root=UUID=02dfb985-99c1-431d-882f-87475db02062 ro
crashkernel=384M-2G:64M,2G-:128M splash elevator=noop vt.handoff=7
[ 67.512014] ehci_hcd 0000:00:1d.0: >Unwanted IRQ: c000 0
[ 67.512021] ehci_hcd 0000:00:1d.0: >Unwanted IRQ: e000 0
[ 67.512023] irq 17: nobody cared (try booting with the "irqpoll" option)
[ 67.512026] Pid: 0, comm: swapper/0 Tainted: G O 3.5.0-17-generic #28
[ 67.512027] Call Trace:
[ 67.512034] [<c10c6ae9>] __report_bad_irq+0x29/0xd0
[ 67.512037] [<c10c6db5>] note_interrupt+0x175/0x1c0
[ 67.512041] [<c1326d63>] ? intel_idle+0xc3/0x120
[ 67.512045] [<c10c4bdf>] handle_irq_event_percpu+0x9f/0x1d0
[ 67.512047] [<c10c4d4b>] handle_irq_event+0x3b/0x60
[ 67.512050] [<c10c7710>] ? unmask_irq+0x30/0x30
[ 67.512052] [<c10c775e>] handle_fasteoi_irq+0x4e/0xd0
[ 67.512053] <IRQ> [<c15d0692>] ? do_IRQ+0x42/0xc0
[ 67.512062] [<c10689fe>] ? enqueue_hrtimer+0x1e/0x70
[ 67.512064] [<c15d04f0>] ? common_interrupt+0x30/0x38
[ 67.512069] [<c10400e0>] ? in_gate_area+0x10/0x50
[ 67.512071] [<c1326d63>] ? intel_idle+0xc3/0x120
[ 67.512076] [<c149b7b5>] ? cpuidle_enter+0x15/0x20
[ 67.512078] [<c149bd18>] ? cpuidle_idle_call+0x88/0x220
[ 67.512081] [<c101870a>] ? cpu_idle+0xaa/0xe0
[ 67.512086] [<c159f715>] ? rest_init+0x5d/0x68
[ 67.512090] [<c18b49be>] ? start_kernel+0x35d/0x363
[ 67.512092] [<c18b44ed>] ? do_early_param+0x80/0x80
[ 67.512094] [<c18b4303>] ? i386_start_kernel+0xa6/0xad
[ 67.512095] handlers:
[ 67.512098] [<c142fe00>] usb_hcd_irq
[ 67.512099] Disabling IRQ #17
[ 69.507175] ehci_hcd 0000:00:1d.0: >Unwanted IRQ: c000 0
[ 69.607118] ehci_hcd 0000:00:1d.0: >Unwanted IRQ: c000 0
The debugging output show that the EHCI controller was not the source
of the unwanted IRQs. And /proc/interrupts shows that ehci-hcd is the
only driver using IRQ #17, for the 0000:00:1d.0 device.
The most likely explanation is that there an interrupt-routing error
and some other device is causing these problems. I don't know of any
easy way to find out what the other device is, however.
Thanks for hinting at the probable source of the problem. I am new to
these things, but the /proc/interrupts lists IO-APIC-fasteoi. Perhaps
there may be some relation to some APIC issue?
Kind regards,
Martin Vysny
Alan Stern
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