linux-kernel - BUG in 2.6.26-rc8 interrupt handling

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Message-ID: <48669252.1000608@nokia.com>
Date:	Sat, 28 Jun 2008 22:34:42 +0300
From:	"Becker Stefan (Nokia-D/Salo)" <Stefan.Becker@...ia.com>
To:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
CC:	ext Alan Stern <stern@...land.harvard.edu>
Subject: BUG in 2.6.26-rc8 interrupt handling

Hi,

[I'm not subscribed to this list, so please CC: me]

[Subject has been changed, please read the rest of the thread for all 
the details]

On my AthlonXP single CPU laptop I experience random lockups when I 
access the external USB harddrive with kernels >2.6.23. The problem 
doesn't appear with 2.6.23.

Debugging revealed that a routine was called twice that takes a 
spinlock. But this actually shouldn't happen, because the function 
should only be invoked with interrupts disabled. A little more debugging 
revealed that apparently sometimes interrupts are enabled when the USB 
HCD interrupt handlers are called, although they are registered with 
IRQF_DISABLED.

With the attached patch ontop of 2.6.26-rc8 I get these messages:

kernel: USB_HCD_IRQ interrupts disabled 14206 enabled 6289
kernel: USB_HCD_IRQ interrupts disabled 14761 enabled 6290
kernel: USB_HCD_IRQ interrupts disabled 14761 enabled 6291

I also attached the contents from /proc/interrupts from the machine.

Any ideas what could be wrong or any suggestions in which direction I 
should continue debugging?

Regards,

	Stefan

---
Stefan Becker   Nokia-TP/Salo            Senior Specialist, EE SW
E-Mail: Stefan.Becker@...ia.com          SMS: 4871554@....??
Office: +358-7180-71554                  FAX: +358-7180-44751
GSM   : +358-50-4871554

View attachment "usb-hcd-interrupts.patch" of type "text/plain" (673 bytes)

View attachment "proc-interrupts.txt" of type "text/plain" (914 bytes)