Re: [PATCH v8 33/38] kselftest/arm64: Add a GCS test program built with the system libc

On Mon, Feb 19, 2024 at 11:15:57PM -0300, Thiago Jung Bauermann wrote:

The only issue as can be seen above is that the can_call_function test is failing. The child is getting a GCS Segmentation fault when returning from fork().

I tried debugging it with GDB, but I don't see what's wrong since the address in LR matches the first entry in GCSPR. Here is the debug session:

I'm simply not seeing this in my testing. There's *something* going on somewhere, I had another report of a similarish thing elsewhere, but not in any way that I've ever been able to reproduce. It smells like there might be something missing with the page tables...