https://github.com/torvalds/linux
Revision 57053d8c5c59562cac156513740c10b502a40968 authored by Matias Bjorling on 10 December 2013, 15:50:38 UTC, committed by Linus Torvalds on 15 December 2013, 20:17:16 UTC
For NUMA systems, initializing the blk-mq layer and using per node hctx.
We initialize submit queues to 1, while blk-mq nr_hw_queues is
initialized to the number of NUMA nodes.

This makes the null_init_hctx function overwrite memory outside of what
it allocated.  In my case it lead to writing garbage into struct
request_queue's mq_map.

Signed-off-by: Matias Bjorling <m@bjorling.me>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent e4158f1
History
Tip revision: 57053d8c5c59562cac156513740c10b502a40968 authored by Matias Bjorling on 10 December 2013, 15:50:38 UTC
null_blk: mem garbage on NUMA systems during init
Tip revision: 57053d8

back to top