Re: [PATCH] bfq-iosched: Ensure bio->bi_blkg is valid before using it

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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




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