This is a note to let you know that I've just added the patch titled dm thin metadata: don't issue prefetches if a transaction abort has failed to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: dm-thin-metadata-don-t-issue-prefetches-if-a-transaction-abort-has-failed.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 2eae9e4489b4cf83213fa3bd508b5afca3f01780 Mon Sep 17 00:00:00 2001 From: Joe Thornber <ejt@xxxxxxxxxx> Date: Tue, 1 Mar 2016 10:58:44 +0000 Subject: dm thin metadata: don't issue prefetches if a transaction abort has failed From: Joe Thornber <ejt@xxxxxxxxxx> commit 2eae9e4489b4cf83213fa3bd508b5afca3f01780 upstream. If a transaction abort has failed then we can no longer use the metadata device. Typically this happens if the superblock is unreadable. This fix addresses a crash seen during metadata device failure testing. Fixes: 8a01a6af75 ("dm thin: prefetch missing metadata pages") Signed-off-by: Joe Thornber <ejt@xxxxxxxxxx> Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/md/dm-thin-metadata.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/drivers/md/dm-thin-metadata.c +++ b/drivers/md/dm-thin-metadata.c @@ -1943,5 +1943,8 @@ bool dm_pool_metadata_needs_check(struct void dm_pool_issue_prefetches(struct dm_pool_metadata *pmd) { - dm_tm_issue_prefetches(pmd->tm); + down_read(&pmd->root_lock); + if (!pmd->fail_io) + dm_tm_issue_prefetches(pmd->tm); + up_read(&pmd->root_lock); } Patches currently in stable-queue which might be from ejt@xxxxxxxxxx are queue-4.4/dm-thin-metadata-don-t-issue-prefetches-if-a-transaction-abort-has-failed.patch queue-4.4/dm-cache-make-sure-every-metadata-function-checks-fail_io.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html