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author | Jens Axboe <axboe@kernel.dk> | 2018-06-02 14:04:07 -0600 |
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committer | Jens Axboe <axboe@kernel.dk> | 2018-06-02 20:35:00 -0600 |
commit | cd4a4ae4683dc2e09380118e205e057896dcda2b (patch) | |
tree | 7991620de08c70556b880e5fc4917382d48e477d /net/kcm | |
parent | d00a11df691466772435ec02471292eae07885e5 (diff) | |
download | linux-stable-cd4a4ae4683dc2e09380118e205e057896dcda2b.tar.gz linux-stable-cd4a4ae4683dc2e09380118e205e057896dcda2b.tar.bz2 linux-stable-cd4a4ae4683dc2e09380118e205e057896dcda2b.zip |
block: don't use blocking queue entered for recursive bio submits
If we end up splitting a bio and the queue goes away between
the initial submission and the later split submission, then we
can block forever in blk_queue_enter() waiting for the reference
to drop to zero. This will never happen, since we already hold
a reference.
Mark a split bio as already having entered the queue, so we can
just use the live non-blocking queue enter variant.
Thanks to Tetsuo Handa for the analysis.
Reported-by: syzbot+c4f9cebf9d651f6e54de@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'net/kcm')
0 files changed, 0 insertions, 0 deletions