[llvm-dev] JIT and atexit crash

Joerg Sonnenberger via llvm-dev llvm-dev at lists.llvm.org
Sun Nov 19 16:04:41 PST 2017

On Mon, Nov 20, 2017 at 12:22:49AM +0100, Alex Denisov via llvm-dev wrote:
> JIT allocates and maps some memory for the execution. Some function X at address 0xdeadbeef is part of this memory.
> JIT calls a code that passes the X to atexit.
> JIT deallocates and unmaps the memory used for execution (either via objectLayer.removeObjectSet or by calling JIT's destructors)
> atexit (cxa_finalize_ranges) calls the X at 0xdeadbeef which does not belong to 'us' anymore, which leads to the crash.

Sounds plausible.

> Given that my assumption is correct what can we do about this? Is there
> anything that can be done to cover this case inside of the Orc engine?

It's not the job of the Orc engine. Just don't use atexit.


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