Kernel 2.5.71 cannot unmount nfs

[Seifert Guido, gse]

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Sorry for the incomplete and unprofessional bugreport, I don't have more
info.=20
I tried Kernel 2.5.71. Everything seems to work fine until I shut down
or try to=20
unmount a mountend nfs filesystem. For several minutes nothing happens,=20
then I get something what looks like a backtrace from the nfs related
code=20
section. Unfortunately there is nothing in the log files afterwards.=20
G.=20

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