Re: kernel BUG at block/bio.c:1787! while initializing scsi_debug on ppc64 host

[Eryu Guan <guaneryu@gmail.com>]

On Tue, Dec 15, 2015 at 01:29:59PM -0500, Martin K. Petersen wrote:
> >>>>> "Eryu" == Eryu Guan <guaneryu@gmail.com> writes:
> 
> Eryu,
> 
> Does the patch below fix the issue?

Unfortunately no, still BUG_ON.

Thanks,
Eryu

> 
> -- 
> Martin K. Petersen	Oracle Linux Engineering
> 
> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
> index 3d22fc3e3c1a..d1eb7aa78b8d 100644
> --- a/drivers/scsi/sd.c
> +++ b/drivers/scsi/sd.c
> @@ -2667,8 +2667,9 @@ static void sd_read_block_limits(struct scsi_disk *sdkp)
>  
>  	if (buffer[3] == 0x3c) {
>  		unsigned int lba_count, desc_count;
> +		u64 max_ws = get_unaligned_be64(&buffer[36]);
>  
> -		sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
> +		sdkp->max_ws_blocks = (u32)max_ws;
>  
>  		if (!sdkp->lbpme)
>  			goto out;