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Subject3.1.0-rc4: oops at elv_put_request()
Caught this one, there was no real load at the moment.
FWIW, setup is ext4 over RAID-6 across 4 disks.

elv_put_request
__blk_put_request
blk_put_request
scsi_execute
scsi_execute_req
scsi_test_unit_ready
sd_check_events
disk_events_workfn
process_one_work
worker_thread
kthread
kernel_thread_helper

$ addr2line -e vmlinux 0xffffffff811bcbbb
block/elevator.c:772

768 void elv_put_request(struct request_queue *q, struct request *rq)
769 {
770 struct elevator_queue *e = q->elevator;
771
772 ===> if (e->ops->elevator_put_req_fn) <===
773 e->ops->elevator_put_req_fn(rq);
774 }


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