I have a 2.4.19-pre5 kernel with preempt-kernel and lock-break
patches applied. When I unmount ext2/3 filesystems I usually
get a hard hang. About the only message I get is:
kjournald[125] exited with preempt_count 1
2.4.19-pre4 with same set of patches does not have this behaviour.
I'm not convinced that its confined to ext3 as unmounts of an
ext2 /usr partition without a journal caused a hard hang as well.
-dennis
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