On Mon, Mar 19, 2012 at 7:02 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Mon, 19 Mar 2012, Paul Taysom wrote: > >> I have rerun my tests without my change on the 3.2.7 kernel and I was >> not able to get it to crash. I even put some code in to do the early >> detection so I didn't have to wait for another thread to stumble >> across the corruption. The way I test is with several flash drivers >> with ext2, ext3, ext4, FAT, and HPFS file systems and just repeatedly >> plug and unplug them. When a flash drive is plugged in with a file >> system, it is automatically mounted. > > That's not the right way to test a race like this. The right way is to > insert ssleep() calls at some appropriate spots, so that you can force > the race to come out the way you want every time. > > What about the question of resetting the bdi pointer at the same time > as some other thread is using it? Have you tested whether Mandeep's > locking suggestion will prevent problems? > > Alan Stern > The checks I added to timer.c seems to the defect every time. With 3.2.7, it never sees the defect. Paul Taysom -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
