Hello, There is patch from Mike. It's part of current pull request to 4.8-rc1 For more details check: - https://www.redhat.com/archives/dm-devel/2016-July/msg00561.html - https://www.redhat.com/archives/dm-devel/2016-August/msg00109.html Lukas On Mon, Aug 22, 2016 at 9:31 AM, Qu Wenruo <quwenruo@xxxxxxxxxxxxxx> wrote: > Hi, Mike and btrfs and dm guys > > When doing regression test on v4.8-rc1, we found that fstests/btrfs/056 > always fails. With the following dmesg: > --- > Buffer I/O error on dev dm-0, logical block 1310704, async page read > Buffer I/O error on dev dm-0, logical block 16, async page read > Buffer I/O error on dev dm-0, logical block 16, async page read > --- > > And bisect leads to the following commits: > --- > commit 99f3c90d0d85708e7401a81ce3314e50bf7f2819 > Author: Mike Snitzer <snitzer@xxxxxxxxxx> > Date: Fri Jul 29 13:19:55 2016 -0400 > > dm flakey: error READ bios during the down_interval > --- > > While according to the document of dm-flakey, it says that when using > drop_writes feature, read bios are not affected: > --- > drop_writes: > All write I/O is silently ignored. > Read I/O is handled correctly. > --- > > If I understand the word "correctly" correctly, it should means READ I/0 is > handled without problem. > > However with this commit, it also corrupt the read bio, leading to the test > failure. > > > At least there are two fixes available here; > 1) Fix fstest scripts > The related macro is "_flakey_drop_and_remount yes", which will > check the fs during the "drop_writes" time. > > Currently, only btrfs/056 calls "_flakey_drop_and_remount" with > "yes". So other test cases are not affected. > > However, even we move the fsck outside of the "drop_writes" range, > although test case can pass without problem, but we will still > get a dmesg error: > "Buffer I/O error on dev dm-0, logical block 1310704, async page read" > > 2) Revert to flakey behavior to allow READ bio > Then everything is back to the old good days. > > Not sure which one is correct for current use case, as I'm not familiar with > dm codes. > > Any idea to fix dm-flaky and keep the READ bio behavior? > > Thanks, > Qu > > > > > > -- > dm-devel mailing list > dm-devel@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/dm-devel -- Lukas Herbolt RHCE, RH436, BSc, SSc Senior Technical Support Engineer Global Support Services (GSS) Email: lherbolt@xxxxxxxxxx -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
