On Thu, 19 Jan 2012, Eric W. Biederman wrote:

On the flip side removing from sysfs with locks held must be done
carefully, and as a default I would recommend not to hold locks over
removing things from sysfs.  As removal blocks waiting for all of the
callers into sysfs those sysfs attributes to complete.

It looks like you are ok on the removal because none of the sysfs
attributes appear to take the slub_lock, just /proc/slabinfo.  But
it does look like playing with fire.

Ok then I guess my last patch is needed to make sysfs operations safe.

It may be good to audit the kernel for locks being held while calling
sysfs functions. Isnt there a lockdep check that ensures that no locks are
held?


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