Re: [PATCH 5/6] generic/775: Fix an infinite loop due to variable name clash

On Fri, Apr 10, 2026 at 12:06:05PM +0530, Ojaswin Mujoo wrote:
> We use i as the iteration variable in the main test loop as well as some
> internal loops. Due to this clash, $i variable of main test loops was
> getting modified by the following loop in prep_mixed_mapping().
> 
> 	for ((i=0; i<num_blocks; i++)); do
> 
> If num_blocks is less than 10 (example ext4 with blocksize 4k and
> cluster size 8k) i would always be set as 3 and the main loop would
> never exit. Use local variable to fix this and while we are at it,
> rename it for clarity.
> 
> Reported-by: Disha Goel <[email protected]>
> Signed-off-by: Ojaswin Mujoo <[email protected]>

Looks good,
Reviewed-by: "Darrick J. Wong" <[email protected]>

--D

> ---
>  tests/generic/775 | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/generic/775 b/tests/generic/775
> index 2a4287bb..6dc005a0 100755
> --- a/tests/generic/775
> +++ b/tests/generic/775
> @@ -41,7 +41,8 @@ prep_mixed_mapping() {
>  
>  	local operations=("W" "H" "U")
>  	local num_blocks=$((awu_max / blksz))
> -	for ((i=0; i<num_blocks; i++)); do
> +	local blkno
> +	for ((blkno=0; blkno<num_blocks; blkno++)); do
>  		local index=$((RANDOM % ${#operations[@]}))
>  		local map="${operations[$index]}"
>  		local mapping="${mapping}${map}"
> -- 
> 2.53.0
> 
>