From: "Rafael J. Wysocki" If there's a swap file on a software RAID, it should be possible to use this file for saving the swsusp's suspend image. Also, this file should be available to the memory management subsystem when memory is being freed before the suspend image is created. For the above reasons it seems that md_threads should not be frozen during the suspend and the appended patch makes this happen, but then there is the question if they don't cause any data to be written to disks after the suspend image has been created, provided that all filesystems are frozen at that time. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton --- drivers/md/md.c | 2 +- 1 files changed, 1 insertion(+), 1 deletion(-) diff -puN drivers/md/md.c~md-do-not-freeze-md-threads-for-suspend drivers/md/md.c --- a/drivers/md/md.c~md-do-not-freeze-md-threads-for-suspend +++ a/drivers/md/md.c @@ -4486,6 +4486,7 @@ static int md_thread(void * arg) * many dirty RAID5 blocks. */ + current->flags |= PF_NOFREEZE; allow_signal(SIGKILL); while (!kthread_should_stop()) { @@ -4502,7 +4503,6 @@ static int md_thread(void * arg) test_bit(THREAD_WAKEUP, &thread->flags) || kthread_should_stop(), thread->timeout); - try_to_freeze(); clear_bit(THREAD_WAKEUP, &thread->flags); _