open-iov.git/tools/guest-diag/nmi_catch.sh, branch m32 Open-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers https://git.vgpu.io/open-iov.git/atom?h=m32 2026-09-28T16:10:17+00:00 guest-diag: nmi_catch.sh - sysrq-l sampler that keeps nvidia kernel stacks 2026-09-28T16:10:17+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-09-28T16:10:17+00:00 urn:sha1:ba95c995a719289f40fedda081df91f576b52c2a The guest RM's expiring waits are kernel busy-polls and all of their functions are notrace, so ftrace/kprobes cannot name them. sysrq-l NMI backtraces can: this sampler triggers them and keeps only the Comm and [nvidia] frame lines per round, so the wait/teardown stacks survive dmesg ring wraps. Caught the adapter-shutdown scrubber stack (channelReadChannelMemdesc <- ceutilsUpdateProgress <- scrubberDestruct <- memmgrDestroyInternalChannels <- gpuStatePreUnload <- nv_shutdown_adapter).