Context
Around a year and a half ago, I’ve asked my former company for some time to
work on an issue that was impacting the debugging capabilities in our project:
gdbserver couldn’t debug multithreaded applications running on a PowerPC32
architecture. The connection to the gdbserver was broken and it couldn’t
control the debug session anymore. Multiple people have already investigated
this problem and I had a good starting point, but we still weren’t sure in
which software component the issue lied: it could have been the toolchain, the
gdbserver, the Linux kernel or the custom patches we applied on top of the
kernel tree. We were quite far away from finding the root cause.
That's roughly what I meant - he should've come out of that experience having learned a lot (there's even an explanation why the other code is better on the mailing list), and had the option of working on a different problem (while he didn't say which I assume it was selected to be more beginner friendly). And instead he's throwing a temper tantrum - that's too risky behaviour for hiring.