linux-kernel - Re: [Bug 8646] New: fw-ohci and ohci1394: panic in softirq, below smp_apic_timer

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Date:	Sun, 17 Jun 2007 23:18:40 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux-kernel@...r.kernel.org
CC:	bugme-daemon@...zilla.kernel.org,
	linux1394-devel@...ts.sourceforge.net
Subject: Re: [Bug 8646] New: fw-ohci and ohci1394: panic in softirq, below
 smp_apic_timer_interrupt

For the lists:

bugme-daemon@...zilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=8646
> 
>            Summary: fw-ohci and ohci1394: panic in softirq, below
>                     smp_apic_timer_interrupt
>            Product: Drivers
>            Version: 2.5
>      KernelVersion: all
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: high
>           Priority: P1
>          Component: IEEE1394
>         AssignedTo: drivers_ieee1394@...nel-bugs.osdl.org
>         ReportedBy: stefan-r-bz@...6.in-berlin.de
> 
> 
> Most recent kernel where this bug did not occur: unknown
> Hardware Environment: SMP i586 and SMP x86-64
> Software Environment: Linux 2.6.x
> 
> If an SBP-2 device is attached and sbp2 or firewire-sbp2 is loaded, any of the
> following commands
> 
> # modprobe -r sbp2 && modprobe -r ohci1394
> # modprobe -r firewire-ohci
> # modprobe -r firewire-sbp2 firewire-ohci
> # modprobe -r firewire-sbp2 && sleep 0 && modprobe -r firewire-ohci
> 
> will lead to a panic with a trace similar to this:
> general protection fault [...]
> Pid: 0, comm: swapper [...]
> run_timer_softirq
> __do_softirq
> call_softirq
> do_softirq
> irq_exit
> smp_apic_timer_interrupt
> mwait_idle
> apic_timer_interrupt
> [...]
> 
> This happened on two different i945GM based boards with Core 2 Duo, 32-bit and
> 64-bit kernels.  The last time I tried this with ohci1394/sbp2 is a while ago. 
> I just saw it now happening in the new drivers too.
> 
> The same trace also happened on an older kernel repeatedly in a totally
> different context, without FireWire drivers loaded:  It could be triggered by
> "make -j" in the kernel source tree, i.e. by a spawning something with many
> subthreads.  I don't have a spare machine with enough RAM available to test
> this again with a recent kernel, for now.  I will try to make the machine where
> I saw it available again.
> 
> I.e. the bug may be entirely outside the old and new FireWire drivers.
> 
> *Not* affected are:
>   - The same machines with
>     "modprobe -r firewire-sbp2 && sleep 0.1 && modprobe -r firewire-ohci",
>   - A VIA KM-266/ AMD-Athlon single-CPU PC, even if running an SMP kernel.


BTW, I didn't give this bug high priority while I knew of this bug in
conjunction with ohci1394, because module removal of ohci1394 is not
possible while sbp2 is logged in into a target since Linux 2.6.17.  But
the new firewire drivers allow it, thus make the bug more visible.


> ------- Comment #1 from stefan-r-bz@...6.in-berlin.de  2007-06-17 14:07 -------
> Created an attachment (id=11773)
>  --> (http://bugzilla.kernel.org/attachment.cgi?id=11773&action=view)
> screenshot
> 

-- 
Stefan Richter
-=====-=-=== -==- =---=
http://arcgraph.de/sr/
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