This is a note to let you know that I've just added the patch titled
drbd: Fix state change in case of connection timeout
to the 3.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drbd-fix-state-change-in-case-of-connection-timeout.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9581f97a687724ea41cf2e145dda4751161198c1 Mon Sep 17 00:00:00 2001
From: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
Date: Mon, 10 Nov 2014 17:21:14 +0100
Subject: drbd: Fix state change in case of connection timeout
From: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
commit 9581f97a687724ea41cf2e145dda4751161198c1 upstream.
A connection timeout affects all volumes of a resource!
Under the following conditions:
A resource with multiple volumes
AND
ko-count >=1
AND
a write request triggers the timeout (ko-count * timeout)
DRBD's internal state gets confused. That in turn may
lead to very miss leading follow up failures. E.g.
"BUG: scheduling while atomic"
Signed-off-by: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
Signed-off-by: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/drbd/drbd_req.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -1629,7 +1629,7 @@ void request_timer_fn(unsigned long data
time_after(now, req_peer->pre_send_jif + ent) &&
!time_in_range(now, connection->last_reconnect_jif, connection->last_reconnect_jif + ent)) {
drbd_warn(device, "Remote failed to finish a request within ko-count * timeout\n");
- _drbd_set_state(_NS(device, conn, C_TIMEOUT), CS_VERBOSE | CS_HARD, NULL);
+ _conn_request_state(connection, NS(conn, C_TIMEOUT), CS_VERBOSE | CS_HARD);
}
if (dt && oldest_submit_jif != now &&
time_after(now, oldest_submit_jif + dt) &&
Patches currently in stable-queue which might be from philipp.reisner@xxxxxxxxxx are
queue-3.18/drbd-fix-state-change-in-case-of-connection-timeout.patch
queue-3.18/drbd-merge_bvec_fn-properly-remap-bvm-bi_bdev.patch
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