Re: [PATCH 2/2] md: fix deadlock while suspending RAID array

2014-03-19 Thread NeilBrown
On Tue, 11 Mar 2014 20:12:10 +0100 Simon Guinot wrote: > Sometimes a deadlock happens while migrating a RAID array level, using > the mdadm --grow command. In the following example, an ext4 filesystem > is installed over a RAID1 array and mdadm is used to transform this > array into a RAID5 one.

[PATCH 2/2] md: fix deadlock while suspending RAID array

2014-03-11 Thread Simon Guinot
Sometimes a deadlock happens while migrating a RAID array level, using the mdadm --grow command. In the following example, an ext4 filesystem is installed over a RAID1 array and mdadm is used to transform this array into a RAID5 one. Here are the observed backtraces for the locked tasks: jbd2/dm-0