The openbsd-ppc64-n2vi Go builder machine is converting over to LUCI build infrastructure and the new workload may have stepped on a pagedaemon corner case. While running 7.5-stable I reproducibly get kernel panics "pmap_enter: failed to allocate pted". I saw recent powerpc64/pmap.c changes from gkoehler@ and kettenis@, so updated the machine to 7.5-snapshot and now see "trap type 300" from pmap_remove. In an effort to reproduce this with a more familiar workload, I tried "/usr/src$ make -j32 build" to pound on the hardware with a similar load average and temperature, but that runs without crashing. I'd welcome suggestions on anything I can do to reduce this to a useful bug report.
https://n2vi.com/t.dmesg latest dmesg https://n2vi.com/t.crash1 ddb serial console from the 7.5-stable panics https://n2vi.com/t.crash2 ddb serial console from the 7.5-snapshot trap Joel has an ssh login on this machine; if power64/pmap.c developers need that as well, I'm happy to accommodate. p.s. Theo, thanks for adding em(4) to the default build; it makes all this much easier.
