# DF-3721 VERDICT

**Status: inconclusive** (hardware-gated), **confidence: certain**
source-level.

## Source proof
- :459/:469/:479 divide by (cmd.data0 & 0xffff), the device-returned
  0.5us tick counter of MXGEFW_DMA_TEST / MXGEFW_CMD_UNALIGNED_TEST.
- Zero divisor => x86 #DE in kernel context => fatal trap/panic.
- Call graph: mxge_reset :1225 (attach :4363, every open :3341),
  mxge_firmware_probe :551, and indirectly the watchdog recovery
  (mxge_watchdog_reset reloads fw + mxge_open :3658-3664).

## Not reproduced
Requires the device to answer the DMA test with ticks==0; guest has no
Myricom NIC (env.txt).

## Fix
fix.diff guards all three divisions (git apply --check clean);
fix_status=not_testable.

## Fix status (batch validation)
Applied with the 36 sibling fix.diffs of this batch in findings/poc/_batch41/all_fixes.patch; single in-guest `make -j6 nativekernel KERNCONF=X86_64_GENERIC` completed RC=0 with zero errors under -Werror (full log: findings/poc/_batch41/fix_build8.log). Behavior A/B intentionally skipped for this Info-tier item.