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| author | Jens Axboe <axboe@fb.com> | 2017-04-20 16:40:36 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-04-20 16:42:02 -0600 |
| commit | b00c53e8f411a0b2be036c41852c6858541afbf7 (patch) | |
| tree | b80938052eb763483a6fb52c42921ccfdd785c6b /block | |
| parent | 720b8ccc45002708c7db1165f72a2d3c6996dba0 (diff) | |
| download | linux-b00c53e8f411a0b2be036c41852c6858541afbf7.tar.gz linux-b00c53e8f411a0b2be036c41852c6858541afbf7.tar.bz2 linux-b00c53e8f411a0b2be036c41852c6858541afbf7.zip | |
blk-mq: fix schedule-while-atomic with scheduler attached
We must have dropped the ctx before we call
blk_mq_sched_insert_request() with can_block=true, otherwise we risk
that a flush request can block on insertion if we are currently out of
tags.
[ 47.667190] BUG: scheduling while atomic: jbd2/sda2-8/2089/0x00000002
[ 47.674493] Modules linked in: x86_pkg_temp_thermal btrfs xor zlib_deflate raid6_pq sr_mod cdre
[ 47.690572] Preemption disabled at:
[ 47.690584] [<ffffffff81326c7c>] blk_mq_sched_get_request+0x6c/0x280
[ 47.701764] CPU: 1 PID: 2089 Comm: jbd2/sda2-8 Not tainted 4.11.0-rc7+ #271
[ 47.709630] Hardware name: Dell Inc. PowerEdge T630/0NT78X, BIOS 2.3.4 11/09/2016
[ 47.718081] Call Trace:
[ 47.720903] dump_stack+0x4f/0x73
[ 47.724694] ? blk_mq_sched_get_request+0x6c/0x280
[ 47.730137] __schedule_bug+0x6c/0xc0
[ 47.734314] __schedule+0x559/0x780
[ 47.738302] schedule+0x3b/0x90
[ 47.741899] io_schedule+0x11/0x40
[ 47.745788] blk_mq_get_tag+0x167/0x2a0
[ 47.750162] ? remove_wait_queue+0x70/0x70
[ 47.754901] blk_mq_get_driver_tag+0x92/0xf0
[ 47.759758] blk_mq_sched_insert_request+0x134/0x170
[ 47.765398] ? blk_account_io_start+0xd0/0x270
[ 47.770679] blk_mq_make_request+0x1b2/0x850
[ 47.775766] generic_make_request+0xf7/0x2d0
[ 47.780860] submit_bio+0x5f/0x120
[ 47.784979] ? submit_bio+0x5f/0x120
[ 47.789631] submit_bh_wbc.isra.46+0x10d/0x130
[ 47.794902] submit_bh+0xb/0x10
[ 47.798719] journal_submit_commit_record+0x190/0x210
[ 47.804686] ? _raw_spin_unlock+0x13/0x30
[ 47.809480] jbd2_journal_commit_transaction+0x180a/0x1d00
[ 47.815925] kjournald2+0xb6/0x250
[ 47.820022] ? kjournald2+0xb6/0x250
[ 47.824328] ? remove_wait_queue+0x70/0x70
[ 47.829223] kthread+0x10e/0x140
[ 47.833147] ? commit_timeout+0x10/0x10
[ 47.837742] ? kthread_create_on_node+0x40/0x40
[ 47.843122] ret_from_fork+0x29/0x40
Fixes: a4d907b6a33b ("blk-mq: streamline blk_mq_make_request")
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 9d7645f24b05..47b810638729 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1571,6 +1571,7 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio) plug = current->plug; if (unlikely(is_flush_fua)) { + blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); if (q->elevator) { blk_mq_sched_insert_request(rq, false, true, true, @@ -1582,6 +1583,7 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio) } else if (plug && q->nr_hw_queues == 1) { struct request *last = NULL; + blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); /* @@ -1626,20 +1628,19 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio) if (same_queue_rq) blk_mq_try_issue_directly(data.hctx, same_queue_rq, &cookie); - - return cookie; } else if (q->nr_hw_queues > 1 && is_sync) { blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); blk_mq_try_issue_directly(data.hctx, rq, &cookie); - return cookie; } else if (q->elevator) { + blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); blk_mq_sched_insert_request(rq, false, true, true, true); - } else if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) + } else if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) { + blk_mq_put_ctx(data.ctx); blk_mq_run_hw_queue(data.hctx, true); + } - blk_mq_put_ctx(data.ctx); return cookie; } |