It then might be a problem with "/dev/loop-control" device node. Which
dynamically find or allocate a free device, but also add and remove loop
devices from the running system.
# drivers/block/loop.c
2090 static void loop_remove(struct loop_device *lo)
2091 {
2092 del_gendisk(lo->lo_disk);
2093 blk_cleanup_queue(lo->lo_queue);
2094 blk_mq_free_tag_set(&lo->tag_set);
2095 put_disk(lo->lo_disk);
2096 kfree(lo);
2097 }
2177 case LOOP_CTL_REMOVE:
2178 ret = loop_lookup(&lo, parm);
2179 if (ret < 0)
2180 break;
2181 if (lo->lo_state != Lo_unbound) {
2182 ret = -EBUSY;
2183 break;
2184 }
2185 if (atomic_read(&lo->lo_refcnt) > 0) {
2186 ret = -EBUSY;
2187 break;
2188 }
2189 lo->lo_disk->private_data = NULL;
2190 idr_remove(&loop_index_idr, lo->lo_number);
2191 loop_remove(lo);
2192 break;
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https://bugs.launchpad.net/bugs/1856871
Title:
i/o error if next unused loop device is queried
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