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...ibguestfs: error: qemu-img: /tmp/libguestfsUIZbDK/overlay1.qcow2: qemu-img > exited for an unknown reason (status -1), see debug messages above Obviously waitpid(2) is failing with ECHILD here: https://github.com/libguestfs/libguestfs/blob/3430c2dd654b19a55d213a9302ac5e4b6a387bee/lib/command.c#L741 That makes no sense because we are supposed to have just forked successfully: https://github.com/libguestfs/libguestfs/blob/3430c2dd654b19a55d213a9302ac5e4b6a387bee/lib/command.c#L479 called from: https://github.com/libguestfs/libguestfs/blob/3430c2dd654b19a55d213a9302ac5e4b6a387bee/lib/command...

Thank you, Rich, This was the issue indeed. export LIBGUESTFS_BACKEND=direct fixed it. The next step I tried was to integrate libguestfs in collectd virt plugin to collect this data automatically. In this case I'm having an unknown error in add_libvirt_dom() (same with add_domain) when it's invoking qemu-img to create overlay image. There is no difference between manual and service

...libguestfsUIZbDK/overlay1.qcow2: > qemu-img > > exited for an unknown reason (status -1), see debug messages above > > Obviously waitpid(2) is failing with ECHILD here: > > > https://github.com/libguestfs/libguestfs/blob/3430c2dd654b19a55d213a9302ac5e4b6a387bee/lib/command.c#L741 > > That makes no sense because we are supposed to have just forked > successfully: > > > https://github.com/libguestfs/libguestfs/blob/3430c2dd654b19a55d213a9302ac5e4b6a387bee/lib/command.c#L479 > > called from: > > > https://github.com/libguestfs/libguestfs/blob/3...

Hello LLVM people, after finishing Chapter 1 and 2 of the KaleidoscopeJIT tutorial, I started to play around with the code and now, I have even more questions than before. I hope that the people reading this could help me with it, to improve my understanding about the LLVM and the JIT. I have also the source code and binaries (Windows) available but because I don't know how the mailing list