From: Heinz Mauelshagen heinzm@redhat.com
commit f99a8e4373eeacb279bc9696937a55adbff7a28a upstream.
If fast table reloads occur during an ongoing reshape of raid4/5/6 devices the target may race reading a superblock vs the the MD resync thread; causing an inconclusive reshape state to be read in its constructor.
lvm2 test lvconvert-raid-reshape-stripes-load-reload.sh can cause BUG_ON() to trigger in md_run(), e.g.: "kernel BUG at drivers/md/raid5.c:7567!".
Scenario triggering the bug:
1. the MD sync thread calls end_reshape() from raid5_sync_request() when done reshaping. However end_reshape() _only_ updates the reshape position to MaxSector keeping the changed layout configuration though (i.e. any delta disks, chunk sector or RAID algorithm changes). That inconclusive configuration is stored in the superblock.
2. dm-raid constructs a mapping, loading named inconsistent superblock as of step 1 before step 3 is able to finish resetting the reshape state completely, and calls md_run() which leads to mentioned bug in raid5.c.
3. the MD RAID personality's finish_reshape() is called; which resets the reshape information on chunk sectors, delta disks, etc. This explains why the bug is rarely seen on multi-core machines, as MD's finish_reshape() superblock update races with the dm-raid constructor's superblock load in step 2.
Fix identifies inconclusive superblock content in the dm-raid constructor and resets it before calling md_run(), factoring out identifying checks into rs_is_layout_change() to share in existing rs_reshape_requested() and new rs_reset_inclonclusive_reshape(). Also enhance a comment and remove an empty line.
Cc: stable@vger.kernel.org Signed-off-by: Heinz Mauelshagen heinzm@redhat.com Signed-off-by: Mike Snitzer snitzer@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/dm-raid.c | 34 ++++++++++++++++++++++++++++------ 1 file changed, 28 insertions(+), 6 deletions(-)
--- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -1869,6 +1869,14 @@ static bool rs_takeover_requested(struct return rs->md.new_level != rs->md.level; }
+/* True if layout is set to reshape. */ +static bool rs_is_layout_change(struct raid_set *rs, bool use_mddev) +{ + return (use_mddev ? rs->md.delta_disks : rs->delta_disks) || + rs->md.new_layout != rs->md.layout || + rs->md.new_chunk_sectors != rs->md.chunk_sectors; +} + /* True if @rs is requested to reshape by ctr */ static bool rs_reshape_requested(struct raid_set *rs) { @@ -1881,9 +1889,7 @@ static bool rs_reshape_requested(struct if (rs_is_raid0(rs)) return false;
- change = mddev->new_layout != mddev->layout || - mddev->new_chunk_sectors != mddev->chunk_sectors || - rs->delta_disks; + change = rs_is_layout_change(rs, false);
/* Historical case to support raid1 reshape without delta disks */ if (rs_is_raid1(rs)) { @@ -2818,7 +2824,7 @@ static sector_t _get_reshape_sectors(str }
/* - * + * Reshape: * - change raid layout * - change chunk size * - add disks @@ -2928,6 +2934,20 @@ static int rs_setup_reshape(struct raid_ }
/* + * If the md resync thread has updated superblock with max reshape position + * at the end of a reshape but not (yet) reset the layout configuration + * changes -> reset the latter. + */ +static void rs_reset_inconclusive_reshape(struct raid_set *rs) +{ + if (!rs_is_reshaping(rs) && rs_is_layout_change(rs, true)) { + rs_set_cur(rs); + rs->md.delta_disks = 0; + rs->md.reshape_backwards = 0; + } +} + +/* * Enable/disable discard support on RAID set depending on * RAID level and discard properties of underlying RAID members. */ @@ -3213,11 +3233,14 @@ size_check: if (r) goto bad;
+ /* Catch any inconclusive reshape superblock content. */ + rs_reset_inconclusive_reshape(rs); + /* Start raid set read-only and assumed clean to change in raid_resume() */ rs->md.ro = 1; rs->md.in_sync = 1;
- /* Keep array frozen */ + /* Keep array frozen until resume. */ set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
/* Has to be held on running the array */ @@ -3231,7 +3254,6 @@ size_check: }
r = md_start(&rs->md); - if (r) { ti->error = "Failed to start raid array"; mddev_unlock(&rs->md);