Messages in this thread | | | Date | Wed, 10 Jun 2009 23:02:47 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH] mmc: prevent dangling block device from accessing stale queues |
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On Thu 2009-06-04 20:00:52, Stefan Bader wrote: > Kernel: 2.6.30-rc7 based > Worked in 2.6.28 (probably only because things went at a different speed) > > Testcase: Use ext3/ext4 on a SD card partitioned with one primary DOS > partition and leave it mounted while suspend/resume. > > Result: After resume the partition table of the SD card has been erased. > > The detailed description can be found at: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/383668 > > In essence the mmc block device frees the generic request queue before > the last user of the gendisk has stopped using it leaving an invalid > queue pointer which get unfortunately re-used before more requests come > in for the old device. > > The bugfix will cause more I/O error messages and might not be the > ultimate way things should work, but it prevents data from getting lost.
Thanks for finding root cause of this! Pavel
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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