From: Martin Lorenz <martin@lorenz.eu.org>
To: Andrew Morton <akpm@osdl.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Jesse Brandeburg <jesse.brandeburg@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: un/shared IRQ problem (was: Re: 2.6.18 - another DWARF2)
Date: Fri, 20 Oct 2006 10:37:41 +0200 [thread overview]
Message-ID: <20061020083741.GA5709@gimli> (raw)
In-Reply-To: <20061019101411.f2466b2e.akpm@osdl.org>
On Thu, Oct 19, 2006 at 10:14:11AM -0700, Andrew Morton wrote:
> On Thu, 19 Oct 2006 08:48:10 -0600
> ebiederm@xmission.com (Eric W. Biederman) wrote:
>
> > >
> > > There are already three interrupt sources on 201, so they are all happy to
> > > share.
> > >
> > > It's e1000. Jesse, you fibbed ;)
> > >
> > > static int e1000_request_irq(struct e1000_adapter *adapter)
> > > {
> > > ...
> > > if (adapter->have_msi)
> > > flags &= ~IRQF_SHARED;
> >
> > Well MSI irqs can't be shared, as they are edged triggered.
> > Is the e1000 really trying to use irq 201? That would indicate
> > a logic failure in the msi irq allocator. It should never allocate
> > an inuse irq.
>
> It's gone very bad. See
> http://www.lorenz.eu.org/~mlo/kernel/dmesg_2.6.18-ie-la-tp-41.5+0813.boot
> http://www.lorenz.eu.org/~mlo/kernel/dmesg_2.6.18-ie-la-tp-41.5+0813.out
>
> > I have to ask what is the state in 2.6.19-rc2? I'm wondering if
> > my turning of the msi irq allocator inside out has fixed this problem.
>
> Martin, please try CONFIG_PCI_MSI=n. I'd expect that to fix it (it always does)
>
> > Does this situation work if MSI is disabled, in 2.6.18?
> >
> > The backwards msi irq allocator in 2.6.18 is so convoluted it may have
> > a corner case where it fails, and that is triggering this mess.
> >
> > If 2.6.19 works with MSI's enabled and 2.6.18 works with MSI disabled
> > I'm inclined to say I have done all that is reasonable.
>
> oh, we haven't tried 2.6.19-rc2 yet? Please do that, with CONFIG_PCI_MSI=y.
ok...
I compliled and installed the latest git yesterday evening and another one
this morning because of a configuration mistake I made
there are new DWARFs but the one I reported for 2.6.18 seem to be fixed
at least I diden't succeed in triggering it
the new ones are in
http://www.lorenz.eu.org/~mlo/kernel/dmesg_2.6.19-rc2-tp-ie-e1-42.5+0737-gce9e3d99-dirty.run
http://www.lorenz.eu.org/~mlo/kernel/dmesg_2.6.19-rc2-tp-ie-e1-42.5+0737-gce9e3d99-dirty.boot
http://www.lorenz.eu.org/~mlo/kernel/interrupts_2.6.19-rc2-tp-ie-e1-42.5+0737-gce9e3d99-dirty
is there too
http://www.lorenz.eu.org/~mlo/kernel/?C=M;O=D
for a list of files I uploaded
[ 64.655000] kobject_add failed for vcs6 with -EEXIST, don't try to register things with the same name in the same directory.
[ 64.655000] [<c0103bfd>] dump_trace+0x69/0x1af
[ 64.655000] [<c0103d5b>] show_trace_log_lvl+0x18/0x2c
[ 64.656000] [<c01043fa>] show_trace+0xf/0x11
[ 64.656000] [<c01044fd>] dump_stack+0x15/0x17
[ 64.656000] [<c01fbf3d>] kobject_add+0x160/0x189
[ 64.657000] [<c0250fec>] class_device_add+0xa2/0x3d8
[ 64.658000] [<c02513ae>] class_device_create+0x7c/0x9c
[ 64.659000] [<c0237858>] vcs_make_sysfs+0x3c/0x7e
[ 64.659000] [<c023c641>] con_open+0x6f/0x7c
[ 64.660000] [<c023259b>] tty_open+0x179/0x2f0
[ 64.661000] [<c016226e>] chrdev_open+0x124/0x13f
[ 64.662000] [<c015e665>] __dentry_open+0xc7/0x1ab
[ 64.662000] [<c015e7c3>] nameidata_to_filp+0x24/0x33
[ 64.662000] [<c015e804>] do_filp_open+0x32/0x39
[ 64.663000] [<c015e84d>] do_sys_open+0x42/0xc3
[ 64.663000] [<c015e907>] sys_open+0x1c/0x1e
[ 64.664000] [<c0102de7>] syscall_call+0x7/0xb
[ 64.664000] DWARF2 unwinder stuck at syscall_call+0x7/0xb
[ 64.664000]
[ 64.664000] Leftover inexact backtrace:
[ 64.664000]
[ 64.664000] =======================
[ 64.666000] kobject_add failed for vcsa6 with -EEXIST, don't try to register things with the same name in the same directory.
[ 64.666000] [<c0103bfd>] dump_trace+0x69/0x1af
[ 64.666000] [<c0103d5b>] show_trace_log_lvl+0x18/0x2c
[ 64.666000] [<c01043fa>] show_trace+0xf/0x11
[ 64.666000] [<c01044fd>] dump_stack+0x15/0x17
[ 64.667000] [<c01fbf3d>] kobject_add+0x160/0x189
[ 64.667000] [<c0250fec>] class_device_add+0xa2/0x3d8
[ 64.668000] [<c02513ae>] class_device_create+0x7c/0x9c
[ 64.668000] [<c0237895>] vcs_make_sysfs+0x79/0x7e
[ 64.669000] [<c023c641>] con_open+0x6f/0x7c
[ 64.670000] [<c023259b>] tty_open+0x179/0x2f0
[ 64.670000] [<c016226e>] chrdev_open+0x124/0x13f
[ 64.670000] [<c015e665>] __dentry_open+0xc7/0x1ab
[ 64.671000] [<c015e7c3>] nameidata_to_filp+0x24/0x33
[ 64.671000] [<c015e804>] do_filp_open+0x32/0x39
[ 64.671000] [<c015e84d>] do_sys_open+0x42/0xc3
[ 64.672000] [<c015e907>] sys_open+0x1c/0x1e
[ 64.673000] [<c0102de7>] syscall_call+0x7/0xb
[ 64.673000] DWARF2 unwinder stuck at syscall_call+0x7/0xb
[ 64.673000]
[ 64.673000] Leftover inexact backtrace:
[ 64.673000]
[ 64.673000] =======================
gruss
mlo
--
Dipl.-Ing. Martin Lorenz
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next prev parent reply other threads:[~2006-10-20 8:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-17 6:37 2.6.18 - another DWARF2 Martin Lorenz
2006-10-17 18:52 ` Jesse Brandeburg
2006-10-18 6:34 ` un/shared IRQ problem (was: Re: 2.6.18 - another DWARF2) Martin Lorenz
2006-10-19 6:26 ` Andrew Morton
2006-10-19 6:39 ` Martin Lorenz
2006-10-19 7:01 ` Andrew Morton
2006-10-19 14:48 ` Eric W. Biederman
2006-10-19 17:14 ` Andrew Morton
2006-10-20 8:37 ` Martin Lorenz [this message]
2006-10-20 8:47 ` Andrew Morton
2006-10-20 9:17 ` Martin Lorenz
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