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| author | Lars Ellenberg <lars.ellenberg@linbit.com> | 2014-07-09 21:18:32 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-07-10 11:06:03 +0200 |
| commit | bbc1c5e8ad6dfebf9d13b8a4ccdf66c92913eac9 (patch) | |
| tree | 5493cdbd6b5912d1c71c5934695d1d382a41c397 /drivers/block | |
| parent | d45b3279a5a2252cafcd665bbf2db8c9b31ef783 (diff) | |
| download | linux-bbc1c5e8ad6dfebf9d13b8a4ccdf66c92913eac9.tar.bz2 | |
drbd: fix regression 'out of mem, failed to invoke fence-peer helper'
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@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/drbd/drbd_nl.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index 1b35c45c92b7..3f2e16738080 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -544,6 +544,12 @@ void conn_try_outdate_peer_async(struct drbd_connection *connection) struct task_struct *opa; kref_get(&connection->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, connection, "drbd_async_h"); if (IS_ERR(opa)) { drbd_err(connection, "out of mem, failed to invoke fence-peer helper\n"); |