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2.8 - Subdivision Surf Modifier poor performance in this mesh
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System Information
Operating system: Linux-5.0.1-050001-generic-x86_64-with-Kubuntu-18.04-bionic 64 Bits
Graphics card: GeForce GTX 960/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.43

Blender Version
Broken: version: 2.80 (sub 50), branch: master, commit date: 2019-03-18 14:56, hash: rBd1f04658d855

Exact steps for others to reproduce the error
Open this .blend file:

Add subsurf modifier on the selected object by default. On my machine Blender hangs, one thread of the CPU working 100%



Event Timeline

YAFU (YAFU) updated the task description. (Show Details)
YAFU (YAFU) updated the task description. (Show Details)Mar 18 2019, 8:47 PM

Probably the same as T60733 as well as T59333. The model in question here has several faces with >170 vertices (massive n-gons).

Thanks for pointing to those similar reports.
I clarify that I do not intend to subsurf to give good results in this mesh, but I think Blender should not hang in that way (at least it does not in 2.79)