oh boy I ran into my FAVOURITE Linux “feature” again, uninterruptible sleep, reproducibly, while at work
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That's not a backwards compat thing though, it's a kernel bug. The point of uninterruptible sleep is that if your process is running *in kernel mode* then you can't kill it except where allowed, because that would kill *kernel code* at a random point and that's Bad™.
So in theory in any non-pathological system state, the kernel shouldn't be leaving a process in uninterruptible sleep for any significant length of time. If it does, either you have a problem or it's a kernel bug or misfeature.
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The worst cases of "really the kernel folks should fix this" that I've seen are NFS and FUSE. Like, I can see how it's hard to do because both of those smush something complicated behind an API designed for local disk FS access, but come on, figure out how to do it already.
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At least in the case of FUSE, you can unwedge the problem process by killing the (presumably unresponsive) FUSE server daemon involved. For NFS I forget if there's some force unmount incantation that works.
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