* Re: [Bug 8646] New: fw-ohci and ohci1394: panic in softirq, below smp_apic_timer_interrupt
[not found] <bug-8646-4803@http.bugzilla.kernel.org/>
@ 2007-06-17 21:18 ` Stefan Richter
0 siblings, 0 replies; only message in thread
From: Stefan Richter @ 2007-06-17 21:18 UTC (permalink / raw)
To: linux-kernel; +Cc: bugme-daemon, linux1394-devel
For the lists:
bugme-daemon@bugzilla.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@kernel-bugs.osdl.org
> ReportedBy: stefan-r-bz@s5r6.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@s5r6.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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