A very good read, thanks for taking the time to put pen to paper and sharing the little useful scripts and tricks. There's a world of heavy-handed hacking out there to use. I used to build hundreds of patched kernels or glibcs to simulate complex systems behaviour (failing read()/write(), incomplete fsync, syscalls in general or the network stack erroring out in all possible ways...) and scenarios of those. Happy to see this explained so simply.
It is quite long, but I've been told it's an interesting read for some audiences. Let me know what you think :)
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