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raid1: include bio_end_io_list in nr_queued to prevent freeze_array hang 

If raid1d is handling a mix of read and write errors, handle_read_error's
call to freeze_array can get stuck.

This can happen because, though the bio_end_io_list is initially drained,
writes can be added to it via handle_write_finished as the retry_list
is processed. These writes contribute to nr_pending but are not included
in nr_queued.

If a later entry on the retry_list triggers a call to handle_read_error,
freeze array hangs waiting for nr_pending == nr_queued+extra. The writes
on the bio_end_io_list aren't included in nr_queued so the condition will
never be satisfied.

To prevent the hang, include bio_end_io_list writes in nr_queued.

There's probably a better way to handle decrementing nr_queued, but this
seemed like the safest way to avoid breaking surrounding code.

I'm happy to supply the script I used to repro this hang.

Fixes: 55ce74d4bfe1b(md/raid1: ensure device failure recorded before write request returns.)
Cc: stable@vger.kernel.org (v4.3+)
Signed-off-by: Nate Dailey <nate.dailey@stratus.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Nate Dailey 2016-02-29 10:43:58 -05:00 committed by Shaohua Li
parent d85326cf86
commit ccfc7bf1f0
1 changed files with 5 additions and 2 deletions
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7
drivers/md/raid1.c
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@ -2274,6 +2274,7 @@ static void handle_write_finished(struct r1conf *conf, struct r1bio *r1_bio)
if (fail) {
spin_lock_irq(&conf->device_lock);
list_add(&r1_bio->retry_list, &conf->bio_end_io_list);
conf->nr_queued++;
spin_unlock_irq(&conf->device_lock);
md_wakeup_thread(conf->mddev->thread);
} else {
@ -2391,8 +2392,10 @@ static void raid1d(struct md_thread *thread)
LIST_HEAD(tmp);
spin_lock_irqsave(&conf->device_lock, flags);
if (!test_bit(MD_CHANGE_PENDING, &mddev->flags)) {
list_add(&tmp, &conf->bio_end_io_list);
list_del_init(&conf->bio_end_io_list);
while (!list_empty(&conf->bio_end_io_list)) {
list_move(conf->bio_end_io_list.prev, &tmp);
conf->nr_queued--;
}
}
spin_unlock_irqrestore(&conf->device_lock, flags);
while (!list_empty(&tmp)) {