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bd169c2be0
We nowadays rename our child processes, hence argv[] will be clobbered,
let's hence copy the device path to dynamic memory before forking.
This is fall-out from 60ffa37a65 since we
now a lot more often end up overriding the argv[] buffer than before,
simple because we know what to override.
These kind of bugs kinda suck. THere are only two options here: stop
overriding argv[] for all cases (or just these cases) or explicitly
copying out everything we need in child processes before forking. With
this patch I opt for the latter, though I am not 100% convinced this is
a great solution. Just a better solution than everything else, i.e.
allowing argv[] to remain out of sync with what others see.
Fixes: #12135
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