From 142207f782dd7f174a1e1b954c3a9dd04316bd95 Mon Sep 17 00:00:00 2001 From: Lars Ellenberg Date: Thu, 19 Feb 2015 13:48:59 +0100 Subject: [PATCH] drbd: drbd_panic_after_delayed_completion_of_aborted_request() The only way to make DRBD intentionally call panic is to set a disk timeout, have that trigger, "abort" some request and complete to upper layers, then have the backend IO subsystem later complete these requests successfully regardless. As the attached IO pages have been recycled for other purposes meanwhile, this will cause unexpected random memory changes. To prevent corruption, we rather panic in that case. Make it obvious from stack traces that this was the case by introducing drbd_panic_after_delayed_completion_of_aborted_request(). Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg Signed-off-by: Jens Axboe --- drivers/block/drbd/drbd_worker.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c index 3b3d980ac8c7..9c89ebe21c6b 100644 --- a/drivers/block/drbd/drbd_worker.c +++ b/drivers/block/drbd/drbd_worker.c @@ -188,6 +188,12 @@ void drbd_peer_request_endio(struct bio *bio) } } +void drbd_panic_after_delayed_completion_of_aborted_request(struct drbd_device *device) +{ + panic("drbd%u %s/%u potential random memory corruption caused by delayed completion of aborted local request\n", + device->minor, device->resource->name, device->vnr); +} + /* read, readA or write requests on R_PRIMARY coming from drbd_make_request */ void drbd_request_endio(struct bio *bio) @@ -231,7 +237,7 @@ void drbd_request_endio(struct bio *bio) drbd_emerg(device, "delayed completion of aborted local request; disk-timeout may be too aggressive\n"); if (!bio->bi_error) - panic("possible random memory corruption caused by delayed completion of aborted local request\n"); + drbd_panic_after_delayed_completion_of_aborted_request(device); } /* to avoid recursion in __req_mod */ -- 2.20.1