From 26ac107378c4742978216be1005b7291b799c7b2 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Wed, 18 Feb 2015 11:35:14 +1100 Subject: [PATCH] md/raid5: Fix livelock when array is both resyncing and degraded. Commit a7854487cd7128a30a7f4f5259de9f67d5efb95f: md: When RAID5 is dirty, force reconstruct-write instead of read-modify-write. Causes an RCW cycle to be forced even when the array is degraded. A degraded array cannot support RCW as that requires reading all data blocks, and one may be missing. Forcing an RCW when it is not possible causes a live-lock and the code spins, repeatedly deciding to do something that cannot succeed. So change the condition to only force RCW on non-degraded arrays. Reported-by: Manibalan P Bisected-by: Jes Sorensen Tested-by: Jes Sorensen Signed-off-by: NeilBrown Fixes: a7854487cd7128a30a7f4f5259de9f67d5efb95f Cc: stable@vger.kernel.org (v3.7+) --- Reading git-format-patch failed