Investigating "Access violation in unknown section at address 0xffffffffffffffff of size 32"

After reading: How to investigate access violation errors, I feel like this error is different from a variety of reasons:

• I'm modifying an existing (working) Anchor project, and strictly using less memory, therefore I find it unlikely that it is a stack overflow issue.

How might I debug this issue?

Is there anyway to get a line number when Solana is throwing this error?

The code for my program:

pub fn taker<'info>(    ctx: Context<'_, '_, '_, 'info, Taker<'info>>,    price: u64,    amount: u64,    is_bid: bool,    market_index: u16,    pos_limit: i64) -> Result<()> {    let taker = ctx.accounts.user.load()?;    let (base_init, _) = taker        .get_perp_position(market_index)        .map_or((0, 0), |p| (p.base_asset_amount, p.quote_asset_amount));    drop(taker);    if is_bid &&  base_init + amount as i64 > pos_limit {        return Err(ErrorCode::PosLimitBreached.into())    }     if !is_bid &&  -base_init + amount as i64 > pos_limit {        return Err(ErrorCode::PosLimitBreached.into())    }    let order_params = OrderParams {        order_type: OrderType::Limit,        market_type: MarketType::Perp,        direction: if is_bid { PositionDirection::Long } else { PositionDirection::Short },        user_order_id: 0,        base_asset_amount: amount,        price: price,        market_index,        reduce_only: false,        post_only: PostOnlyParam::None,        immediate_or_cancel: true,        max_ts: None,        trigger_price: None,        trigger_condition: OrderTriggerCondition::Above,        oracle_price_offset: None,        auction_duration: None,        auction_start_price: None,        auction_end_price: None,    };    place_and_take(&ctx, order_params)?;    let taker = ctx.accounts.user.load()?;    let (base_end, _) = taker        .get_perp_position(order_params.market_index)        .map_or((0, 0), |p| (p.base_asset_amount, p.quote_asset_amount));    if base_end == base_init {        return Err(ErrorCode::NoFill.into());    }    Ok(())}

This is a modified version of the original contract here:https://github.com/drift-labs/jit-proxy/blob/master/programs/jit-proxy/src/instructions/arb_perp.rs

I've modified this existing (deployed) contract that seems to work, so I assume I must've messed up somewhere. I'm still learning Rust, so would like to learn how to I can debug these issues in the future.

Any assistance would be greatly appreciated.