Messages in this thread | | | From | Akinobu Mita <> | Subject | [PATCH v2 0/6] blk-mq: fix race conditions on cpu hotplug handling | Date | Thu, 2 Jul 2015 23:29:51 +0900 |
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This patchset addresses several race conditions on cpu hotplug handling for blk-mq. All problems are reproducible by the following script.
while true; do echo 0 > /sys/devices/system/cpu/cpu1/online echo 1 > /sys/devices/system/cpu/cpu1/online done &
while true; do modprobe -r null_blk modprobe null_blk queue_mode=2 irqmode=1 sleep 0.1 done
* Changes from v1 - Release q->mq_map in blk_mq_release() - Fix deadlock when reading cpu_list - Fix race freeze and unfreeze
Akinobu Mita (6): blk-mq: fix sysfs registration/unregistration race blk-mq: Fix use after of free q->mq_map blk-mq: fix q->mq_usage_counter access race blk-mq: avoid inserting requests before establishing new mapping blk-mq: fix freeze queue race blk-mq: fix deadlock when reading cpu_list
block/blk-core.c | 2 ++ block/blk-mq-cpumap.c | 9 +++--- block/blk-mq-sysfs.c | 50 ++++++++++++++++++++++--------- block/blk-mq.c | 81 ++++++++++++++++++++++++++++++-------------------- block/blk-mq.h | 5 ++-- include/linux/blkdev.h | 9 ++++++ 6 files changed, 102 insertions(+), 54 deletions(-)
Cc: Jens Axboe <axboe@kernel.dk> Cc: Ming Lei <tom.leiming@gmail.com> -- 1.9.1
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