On Mon, Oct 24, 2022, at 21:31, Raphaël Halimi wrote:
> I don't know how to use strace. Could you please direct me ?

If you find the process that hangs (likely a ccache process in this case) with
PID P, use

    strace -p P

to attach to it and see which system call it is waiting for.

> The file does not exist on my machine; do I just need to create
> /var/cache/pbuilder/ccache/ccache.conf containing a single line "log_file=..."
> or is there something else to do ?

Yes, something like

    echo "log_file = /var/cache/pbuilder/ccache/ccache.log" 
>/var/cache/pbuilder/ccache/ccache.conf

should do it.

Regards,
Joel

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