Re: Stumped: Seg Fault with System.Secondary_Stack.SS_Mark()

[awdorrin <awdorrin@gmail.com>]

I have done some more investigation this morning.

As suggested, I removed the string concat in the ADD_TO_Q() call.
Checking the rde_b.ada.dg file showed that there was no references to the secondary stack, within that function. (Unfortunately, looking at all the other .dg files generated, I saw over 5000 references to usage of the secondary stack.)

I verified that each pthread is being provided with 8MB of space for their stack. (This program starts off from C and spawns threads, which are mixed Ada and C.)

I'm not yet sure how to verify the default stack/secondary stack sizes in GNAT (although I've seen the -d/-D gnat flags for explicitly setting the sizes) - still researching.

Yesterday, this program could run for random amounts of time before seg faulting, sometimes over 30 minutes, so I have it running again to see what I can get to happen. I figure it very well could crash in another routine which uses the secondary stack - until I figure out what the root cause is...