Messages in this thread | | | Date | Fri, 13 Jan 2012 00:42:07 -0500 | Subject | Re: [PATCH] fs: Fix mod_timer crash when removing USB sticks | From | Josh Boyer <> |
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On Thu, Jan 12, 2012 at 4:15 PM, Paul Taysom <taysom@chromium.org> wrote: > From: Paul Taysom <taysom@google.com> > > A USB stick with a ext file system on it, would occasionally crash > when the stick was pulled. > > The problem was a timer was being set on the Backing Device Interface, > bdi, after the USB device had been removed and the bdi had been > unregistered. The bdi would then be later reinitialized by zeroing > the timer without removing from the timer from the timer queue. > This would eventually result in a kernel crash (NULL ptr dereference).
What backtrace did you see when it crashed? There have been a number of reports where sd_revalidate_disk is at the top of the backtrace and this sounds like it might be related.
josh
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