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SubjectRe: / busy and 2.1.122
Hi,

On Mon, 28 Sep 1998 15:08:29 -0700, "D.A. Harris"
<rodmur@ecst.csuchico.edu> said:

> Hopefully this is just simple problem, but I just did an upgrade from
> 2.1.115 to 2.1.122, and now when I reboot, / is busy and not unmouting
> cleanly. Could this be a problem with the kernel?

This is a FAQ. Older kernels did not complain if you tried to remount
as readonly a filesystem which had orphaned (deleted but still open)
files present. They should have done so, and current kernels do.

The problem is most often caused by mmap()s of /etc/ld.so.cache left
around by glibc: if you do an ldconfig, then old processes such as init
will still be left with an open handle onto the old version of
ld.so.cache. The latest versions of glibc-2.0.7 unmap this file after
loading to deal more appropriately with the fixed kernel behaviour.

> also do we need "update (bdflush)" daemon once there is a "(kflushd)"
> kernel thread running?

Yes. update is a daemon triggered to write out dirty data after a
certain amount of time. kflushd is there to trickle dirty buffers out
if the kernel is running out of memory internally. Correct operation
needs both. This is also a FAQ!

--Stephen

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