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Description of problem: a deadlock might happen if the kernel is configured with SLUB and loop over tmpfs is used if compaction is enabled (even if THP is off).


Version-Release number of selected component (if applicable): 6.0/6.1/master


How reproducible: not reproducible (probably impossible to reproduce with RHEL6.0 and RHEL6.1 because of SLAB being selected instead of SLUB)


Steps to Reproduce:
1. build the kernel with CONFIG_COMPACTION=y and CONFIG_SLUB=y
2. create a loop over tmpfs
3. copy data to loop device (writes to the loop device that require writeback)
  
Actual results: it must not deadlock


Expected results: it might deadlock (reproduced only once by Hugh with a modified tmpfs/shmem code, not reproducible)

Patch submitted to rhkernel-list with Message-ID: <20110325201201.GA29142>

Patch(es) available on kernel-2.6.32-130.el6

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0542.html