Virus Snow/TI crash - Githubissues

After switching presets back & forth, DSP stops and corrupted sound can be heard
In the test console, the preset HrdshellNM (Snow/TI2) is played incorrectly, it sounds as if a delay line is broken

After some time, one of the following issues happen:

An invalid DMA transfer is initiated that corrupts parts of the DSP memory. Usually, the DDR is small and DCO is very high. This corrupts large parts of DSP memory. Usually, interrupts stay intact, causing audio to be broken. If interrupts are overwritten, too, the plugin / test console hangs as the DSP doesn't deliver samples anymore
The DSP hits a debugge instruction at $053b19. Sometimes, the DSP execution continues normally, in other cases, the DMA failure follows with the consequences as above. The debugge seems to be part of a memory alloc/free pair. malloc at $053b0f, free at $053b23. In rare cases, the debugle is hit in the free code instead

Seems to be triggered by certain presets
Happens on both Snow and TI2, firmware 5.1.7
The behaviour is identical in the interpreter and the JIT recompiler
DMA is always used as memFill, it fills a memory area with the value $000005 (asm illegal)
There is a chain of pending DMA transfers. The first DMA transfer is initiated manually, further DMA transfers (if the chain is not empty) are initiated from within the DMA interrupt
As mentioned above, debugge and debugle are most likely part of a malloc/free pair

Slowing down or speeding up HDI08 transfer rates didn't make any difference
A pending DMA is never aborted or restarted
As long as a DMA is pending, that area of memory is neither read nor written by any other op
DMA transfers need to be delayed by N instructions (see manual), if a DMA is executed instantly, other problems arise and the code indicates that a proper DMA delay is needed. While respecting a DMA delay, slowing down or speeding up DMAs doesn't make any difference
All synth features, such as Oscillators, Filters, etc seem to sound correct when tested

dsp56300 / gearmulator