Note, this merged into Xenial via bug 1775771 by standard upstream
stable merge process; it landed in Xenial commit
25ef67b828ea16b768ce2c549c2c92b9cad79ceb which is included starting at
kernel 4.4.0-129.155.

** Changed in: linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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  fscache: Fix hanging wait on page discarded by writeback

Status in linux package in Ubuntu:
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:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==

  Under heavy NFS + FSCache load, a user sometimes observes a hang in 

  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

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

  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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