This is a note to let you know that I've just added the patch titled
drbd: fix regression 'out of mem, failed to invoke fence-peer helper'
to the 3.10-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-regression-out-of-mem-failed-to-invoke-fence-peer-helper.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bbc1c5e8ad6dfebf9d13b8a4ccdf66c92913eac9 Mon Sep 17 00:00:00 2001
From: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
Date: Wed, 9 Jul 2014 21:18:32 +0200
Subject: drbd: fix regression 'out of mem, failed to invoke fence-peer helper'
From: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
commit bbc1c5e8ad6dfebf9d13b8a4ccdf66c92913eac9 upstream.
Since linux kernel 3.13, kthread_run() internally uses
wait_for_completion_killable(). We sometimes may use kthread_run()
while we still have a signal pending, which we used to kick our threads
out of potentially blocking network functions, causing kthread_run() to
mistake that as a new fatal signal and fail.
Fix: flush_signals() before kthread_run().
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_nl.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -514,6 +514,12 @@ void conn_try_outdate_peer_async(struct
struct task_struct *opa;
kref_get(&tconn->kref);
+ /* We may just have force_sig()'ed this thread
+ * to get it out of some blocking network function.
+ * Clear signals; otherwise kthread_run(), which internally uses
+ * wait_on_completion_killable(), will mistake our pending signal
+ * for a new fatal signal and fail. */
+ flush_signals(current);
opa = kthread_run(_try_outdate_peer_async, tconn, "drbd_async_h");
if (IS_ERR(opa)) {
conn_err(tconn, "out of mem, failed to invoke fence-peer helper\n");
Patches currently in stable-queue which might be from lars.ellenberg@xxxxxxxxxx are
queue-3.10/drbd-fix-regression-out-of-mem-failed-to-invoke-fence-peer-helper.patch
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