oh boy I ran into my FAVOURITE Linux “feature” again, uninterruptible sleep, reproducibly, while at work
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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.
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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`umount -l` "hides" the problem, as far as I understood. Yeah, those zombie processes are *incredibly* annoying.
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Honestly my opinion is that the bug is that the kernel has uninterruptable sleep at all If you're sleeping in kernel space you should be prepared for the consequences
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Yeah, but when any random mutex can make you sleep on something unexpected via a complex chain of dependencies.... Modem preemptible SMP OSes are hard.
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