On 12/5/19 5:53 AM, Hou Tao wrote: > bio->bi_blkg will be NULL when the issue of the request > has bypassed the block layer as shown in the following oops: > > Internal error: Oops: 96000005 [#1] SMP > CPU: 17 PID: 2996 Comm: scsi_id Not tainted 5.4.0 #4 > Call trace: > percpu_counter_add_batch+0x38/0x4c8 > bfqg_stats_update_legacy_io+0x9c/0x280 > bfq_insert_requests+0xbac/0x2190 > blk_mq_sched_insert_request+0x288/0x670 > blk_execute_rq_nowait+0x140/0x178 > blk_execute_rq+0x8c/0x140 > sg_io+0x604/0x9c0 > scsi_cmd_ioctl+0xe38/0x10a8 > scsi_cmd_blk_ioctl+0xac/0xe8 > sd_ioctl+0xe4/0x238 > blkdev_ioctl+0x590/0x20e0 > block_ioctl+0x60/0x98 > do_vfs_ioctl+0xe0/0x1b58 > ksys_ioctl+0x80/0xd8 > __arm64_sys_ioctl+0x40/0x78 > el0_svc_handler+0xc4/0x270 > > so ensure its validity before using it. Applied, thanks. -- Jens Axboe
