Hi!
> > There were actually several races in the shell library timeout handling.
> >
> > This commit fixes hopefully all of them by:
> >
> > * Reimplementing the backgroud timer in C
> I did that once, but at that point it was kinda rejected ;)

> See https://lists.linux.it/pipermail/ltp/2021-May/022445.html
> and https://lists.linux.it/pipermail/ltp/2021-May/022453.html

I guess we found out the hard way that it's impossible to write raceless
timeouts in shell.