crash if JIT is enabled

[bebbo]

I'm testing libpthread atm... and I get a WinUAE crash if JIT is enabled:

WinUAE message


JIT: serious error
JIT: 64-bit pointer (0xffffffffffffff8b) at
c:\projects\winuae\src\jit\exception_handler.cpp:510 (fatal)

Using WinUAE 4.4.0 (2020.07.01) 64.bit


program and config are attached

[Toni Wilen]

I can't duplicate.

Perhaps it is the usual too small stack. JIT really does not like if return address is corrupted.

[bebbo]

Originally Posted by Toni Wilen

I can't duplicate.

Perhaps it is the usual too small stack. JIT really does not like if return address is corrupted.

(spam the exe and pray)



never mind - I found the real cause^^ - but IMHO WinUAE should not crash^^


HNY2021

[Toni Wilen]

JIT can and will crash if program does too bad/stupid things.

Usually it seems to happen when branch/jump instructions (that was already translated) suddenly gets invalid target address when it runs translated code. It is not validated anymore after translation to keep it as fast as possible.

I am not going to touch JIT too much. I already had to fix some old shift instruction bugs and it is really annoying work and it still needs to be more optimal.

[bebbo]

Originally Posted by Toni Wilen

JIT can and will crash if program does too bad/stupid things.

Usually it seems to happen when branch/jump instructions (that was already translated) suddenly gets invalid target address when it runs translated code. It is not validated anymore after translation to keep it as fast as possible.

I am not going to touch JIT too much. I already had to fix some old shift instruction bugs and it is really annoying work and it still needs to be more optimal.

good to know


I disabled JIT and was able to hunt down the culprit. libpthread is working better now and libnix provides thread safe FILE functions (if all is build for thread usage)^^


Thank you for WinUAE and HNY 2021