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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

This bug was nominated against a series that is no longer supported, ie
artful.  The bug task representing the artful nomination is being closed
as Won't Fix.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu Artful)
       Status: Fix Committed => Won't Fix

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https://bugs.launchpad.net/bugs/1777029

Title:
  fscache: Fix hanging wait on page discarded by writeback

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Artful:
  Won't Fix
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==

  [Impact]
  Under heavy NFS + FSCache load, a user sometimes observes a hang in __fscache_wait_on_page_write+0x5f/0xa0.

  Example traces:
  [<ffffffffc009f1bf>] __fscache_wait_on_page_write+0x5f/0xa0 [fscache]
  [<ffffffffc009f6da>] __fscache_uncache_all_inode_pages+0xba/0x120 [fscache]
  [<ffffffffc0419ece>] nfs_fscache_open_file+0x4e/0xc0 [nfs]

  [<ffffffffc034f1bf>] __fscache_wait_on_page_write+0x5f/0xa0 [fscache]
  [<ffffffffc04104dc>] __nfs_fscache_invalidate_page+0x2c/0x80 [nfs]
  [<ffffffffc03fb543>] nfs_invalidate_page+0x63/0x90 [nfs]
  [<ffffffff811925c0>] truncate_inode_page+0x80/0x90

  [Fix]
  Cherry-pick 2c98425720233ae3e135add0c7e869b32913502f from upstream, which is a patch from the FSCache maintainer.

  [Testcase]
  The user has run a NFS stress-test with a similar home-grown patch, and will run a stress test on the proposed kernel.

  [Regression Potential]
  Patch is limited to FSCache, so regression potential is limited.

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