(fixed Jens' address) On Thu, Mar 10, 2016 at 06:37:27PM +0100, Jan Kara wrote: > On Thu 10-03-16 13:26:03, Rabin Vincent wrote: > > If a block device is closed while iterate_bdevs() is handling it, the > > following NULL pointer dereference occurs because bdev->b_disk is NULL > > in bdev_get_queue(), which is called from blk_get_backing_dev_info() (in > > turn called by the mapping_cap_writeback_dirty() call in > > __filemap_fdatawrite_range()): > > Thanks for spotting the problem. The patch will fix the problem you > found. But what prevents e.g. flusher thread from trying to writeback > the block device inode while that gets invalidated at the same moment? Don't the sync_block_dev() / bdev_write_inode() calls in __blkdev_put() prevent this? -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
