This is a note to let you know that I've just added the patch titled
bio: safeguard REQ_ALLOC_CACHE bio put
to the 6.0-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:
bio-safeguard-req_alloc_cache-bio-put.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit aecab32597752b38576134bf2a0eb50a97f326c1
Author: Pavel Begunkov <asml.silence@xxxxxxxxx>
Date: Tue Oct 18 20:50:55 2022 +0100
bio: safeguard REQ_ALLOC_CACHE bio put
[ Upstream commit d4347d50407daea6237872281ece64c4bdf1ec99 ]
bio_put() with REQ_ALLOC_CACHE assumes that it's executed not from
an irq context. Let's add a warning if the invariant is not respected,
especially since there is a couple of places removing REQ_POLLED by hand
without also clearing REQ_ALLOC_CACHE.
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/r/558d78313476c4e9c233902efa0092644c3d420a.1666122465.git.asml.silence@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/block/bio.c b/block/bio.c
index 77e3b764a078..fc2364cf1775 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -741,7 +741,7 @@ void bio_put(struct bio *bio)
return;
}
- if (bio->bi_opf & REQ_ALLOC_CACHE) {
+ if ((bio->bi_opf & REQ_ALLOC_CACHE) && !WARN_ON_ONCE(in_interrupt())) {
struct bio_alloc_cache *cache;
bio_uninit(bio);
