cgraph->work == NULL eventually causes null pointer crash in ggml.c

[RndyP]

The eventual crash occurs here:
dst_data is NULL because params->wdata is NULL

Cause is way up the stack where cgraph->work is zero:

This check is interesting:

My environment is Visual Studio 2022. Crash occurs with optimizations on or disabled.
Crash occurs fairly repeatably by simply streaming room noise in whisper.
I can debug somewhat with Visual Studio when I turn off optimizations, although I have no idea what exactly the code is doing.
Let me know if you have any questions or need help. I am hoping if you look at these sections you will have an epiphany.

[RndyP]

Hmm, I got the latest version of ggml.c a couple of hours ago, and it seems this issue is fixed. I will close this tomorrow after a few more hours of testing.

[RndyP]

Problem is back now. I thought the latest version fixed this, but apparently not. I set audio_ctx to 1536, and now it's back.

[ggerganov]

The audio_ctx cannot be larger than 1500. Added checks to prevent that in the future