1:42:07dougk Jesin: of course it existed. See https://patchwork.kernel.org/patch/9815493/
1:44:05Jesindougk: oh ok, thanks. Still, it seems it was standardized with the name "ucontext_t" a while back, and my system does not have "struct ucontext"
8:58:53scymtymdougk: lots of crashes "GC invariant lost, file "marknsweepgc.c", line 2259" on x86_64 when dumping an image. seems to have started with commit "x86-64: Save absolute assembler routine fixups"