On 7/3/18 3:15 PM, Jens Axboe wrote: > commit cd4a4ae4683dc2e09380118e205e057896dcda2b upstream. > > 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. > > We're running fio tests and the tasks get stuck in a D state forever > when systemd-udevd tries to read the partition table. This patch solves > it. Please apply to 4.17 stable. > > Reported-by: syzbot+c4f9cebf9d651f6e54de@xxxxxxxxxxxxxxxxxxxxxxxxx > Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> > Signed-off-by: Alexandru Moise <00moses.alexander00@xxxxxxxxx> WTF? Please don't send out emails with my name. Ever. -- Jens Axboe
