linux-kernel - un/shared IRQ problem (was: Re: 2.6.18

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Message-ID: <20061018063431.GE20238@gimli>
Date:	Wed, 18 Oct 2006 08:34:31 +0200
From:	Martin Lorenz <martin@...enz.eu.org>
To:	Jesse Brandeburg <jesse.brandeburg@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: un/shared IRQ problem (was: Re: 2.6.18 - another DWARF2)

On Tue, Oct 17, 2006 at 11:52:16AM -0700, Jesse Brandeburg wrote:
> On 10/16/06, Martin Lorenz <martin@...enz.eu.org> wrote:
> >just got the following on resume:
> >
> >[87026.706000]  [<c0251745>] e1000_open+0xcd/0x1a4
> >[87026.714000] DWARF2 unwinder stuck at syscall_call+0x7/0xb
> >[87026.715000] Leftover inexact backtrace:
> >[87026.715000] e1000: eth0: e1000_request_irq: Unable to allocate interrupt
> >Error: -16
> 
> I'm pretty sure this isn't an e1000 problem.  you need to talk to
> whoever is maintaining the IRQ subsystem for x86.  E1000 is attempting
> to register a shared interrupt and someone has already registered that
> interrupt unshared.

interestingly though it always involves e1000 when I see dumps like this.
I already reported more of those :-)
this one dosen't seem to do any harm to system stability. it occurs on every
suspend/resume and I can circumvent it by disabling msi

> 
> looks like several devices are sharing IRQ 201 (aka GSI 16) and ahci
> or usb uhci_hcd is likely the problem, or the (acpi) power management
> subsystem.
> 
> Hope this helps get the right people involved.

thank you

gruss
  mlo
--
Dipl.-Ing. Martin Lorenz

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