On Sat, 9 Apr 2011 23:33:14 +0200 richard -rw- weinberger <richard.weinber...@gmail.com> wrote:
> We have had some problems with the block layer in ~2.6.32 to 2.6.35. > Commit 4752690 fixed the issues. > > Can you please re-test it with 2.6.38? Same crash with 2.6.38, so it's either very sneaky btrfs bug or some discrepancy in ubd. > Does you script work with other file systems? Tested on ext4, xfs, jfs and reiserfs3. All survive the load of creating and deleting 1000 files. By on-disk load reiserfs3 should be quite similar to btrfs, so I expected it to show problems, but it didn't. [n00bish speculation] btrfs also plays games with mm. Maybe the problem sits somewhere there where block layer/page cache and on-disk layout gets out-of-sync. [sf] ~/linux-2.6/fs/btrfs:fgrep -R PageDirty . ./extent_io.c: if (!PageDirty(pages[i]) || ./extent_io.c: if (!PageDirty(page)) ./extent_io.c: if (!PageDirty(page)) { ./disk-io.c: if (PageDirty(page)) ./disk-io.c: if (PageWriteback(page) || PageDirty(page)) ./disk-io.c: if (PageDirty(page)) { ./transaction.c: if (PageDirty(page)) ./transaction.c: if (PageDirty(page)) { ./ioctl.c: if (PageDirty(page)) { ./inode.c: if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { ./inode.c: if (PageWriteback(page) || PageDirty(page)) I'll try to send bug report to linux-btrfs mailing list first and return if I'll have more details. -- Sergei
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