On Tue, Mar 09, 2010 at 10:45:13AM -0800, Philip Love wrote: > I had some 10gb files that I was using for random write testing (with cow enabled). I remount the fs with nodatacow, then ran btrfsctl to defragement the file. A BUG message appeared in the messages file. After a reboot btrfsck gave no errors. > > Please let me know what extra information you need. > Thanks > Phil > > Mar 9 10:12:25 sentryA kernel: [66771.230266] BUG: Bad page state in process btrfsctl pfn:201575 > Mar 9 10:12:25 sentryA kernel: [66771.230270] page:ffffea000704b198 flags:0040000000000000 count:-1608652401 mapcount:0 mapping:ffff88002e84b000 index:ffffc90002633d40 Well, I don't think that count is quite right. But I also don't see anything in the ioctl that could cause it. How easily can you reproduce this? I do see that the ioctl should be triple checking the page is part of the mapping after doing a readpage on it, but it should only get dropped in the face of truncate. Is this file actively in use at the time that you're running the ioctl? -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
