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From: CAI Qian <caiqian@redhat.com>
To: Dave Chinner <david@fromorbit.com>
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Subject: Re: local DoS - systemd hang or timeout (WAS: Re: [RFC][CFT]
 splice_read reworked)
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> Here you are,
> 
> http://people.redhat.com/qcai/tmp/dmesg
Also, this turned out to be a regression and bisecting so far pointed out this commit,

commit 5d50ac70fe98518dbf620bfba8184254663125eb
Merge: 31c1feb 4e14e49
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed Nov 11 20:18:48 2015 -0800

    Merge tag 'xfs-for-linus-4.4' of git://git.kernel.org/pub/scm/linux/kernel/g
    
    Pull xfs updates from Dave Chinner:
     "There is nothing really major here - the only significant addition is
      the per-mount operation statistics infrastructure.  Otherwises there's
      various ACL, xattr, DAX, AIO and logging fixes, and a smattering of
      small cleanups and fixes elsewhere.
    
      Summary:
    
       - per-mount operational statistics in sysfs
       - fixes for concurrent aio append write submission
       - various logging fixes
       - detection of zeroed logs and invalid log sequence numbers on v5 filesys
       - memory allocation failure message improvements
       - a bunch of xattr/ACL fixes
       - fdatasync optimisation
       - miscellaneous other fixes and cleanups"

    * tag 'xfs-for-linus-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/d
      xfs: give all workqueues rescuer threads
      xfs: fix log recovery op header validation assert
      xfs: Fix error path in xfs_get_acl
      xfs: optimise away log forces on timestamp updates for fdatasync
      xfs: don't leak uuid table on rmmod
      xfs: invalidate cached acl if set via ioctl
      xfs: Plug memory leak in xfs_attrmulti_attr_set
      xfs: Validate the length of on-disk ACLs
      xfs: invalidate cached acl if set directly via xattr
      xfs: xfs_filemap_pmd_fault treats read faults as write faults
      xfs: add ->pfn_mkwrite support for DAX
      xfs: DAX does not use IO completion callbacks
      xfs: Don't use unwritten extents for DAX
      xfs: introduce BMAPI_ZERO for allocating zeroed extents
      xfs: fix inode size update overflow in xfs_map_direct()
      xfs: clear PF_NOFREEZE for xfsaild kthread
      xfs: fix an error code in xfs_fs_fill_super()
      xfs: stats are no longer dependent on CONFIG_PROC_FS
      xfs: simplify /proc teardown & error handling
      xfs: per-filesystem stats counter implementation
      ...