From: Dan Streetman <dan.streetman@xxxxxxxxxxxxx>
This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit da6ccaaa79caca4f38b540b651238f87215217a2 ]
Make the "Attempted send on closed socket" error messages generated in
nbd_request_handler() ratelimited.
When the nbd socket is shutdown, the nbd_request_handler() function emits
an error message for every request remaining in its queue. If the queue
is large, this will spam a large amount of messages to the log. There's
no need for a separate error message for each request, so this patch
ratelimits it.
In the specific case this was found, the system was virtual and the error
messages were logged to the serial port, which overwhelmed it.
Fixes: 4d48a542b427 ("nbd: fix I/O hang on disconnected nbds")
Signed-off-by: Dan Streetman <dan.streetman@xxxxxxxxxxxxx>
Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/block/nbd.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 39e5f7f..9911b20 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -557,8 +557,8 @@ static void do_nbd_request(struct request_queue *q)
req, req->cmd_type);
if (unlikely(!nbd->sock)) {
- dev_err(disk_to_dev(nbd->disk),
- "Attempted send on closed socket\n");
+ dev_err_ratelimited(disk_to_dev(nbd->disk),
+ "Attempted send on closed socket\n");
req->errors++;
nbd_end_request(nbd, req);
spin_lock_irq(q->queue_lock);
--
2.5.0
--
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