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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

This bug was nominated against a series that is no longer supported, ie
yakkety.  The bug task representing the yakkety 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 Yakkety)
       Status: Fix Committed => Won't Fix

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https://bugs.launchpad.net/bugs/1701316

Title:
  Data corruption with hio driver

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Invalid
Status in linux source package in Yakkety:
  Won't Fix
Status in linux source package in Zesty:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed

Bug description:
  Impact: Data corruption is seen when using the hio driver with 4.10
  and later kernels.

  Fix: Patch to fix incorrect use of enumerated values as bitmasks.

  Test case: See below.

  Regression potential: Very low. Changes are simple and Obviously
  Correct (TM), and they only affect the hio driver.

  ---

  We are seeing data corruption issues using the hio driver with kernel
  4.10.0

  # uname -a
  Linux arbok 4.10.0-26-generic #30~16.04.1-Ubuntu SMP Tue Jun 27 09:40:14 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

  Making xfs fails:

  root@arbok:~# mkfs.xfs /dev/hioa
  meta-data=/dev/hioa              isize=512    agcount=4, agsize=48835584 blks
           =                       sectsz=512   attr=2, projid32bit=1
           =                       crc=1        finobt=1, sparse=0
  data     =                       bsize=4096   blocks=195342336, imaxpct=25
           =                       sunit=0      swidth=0 blks
  naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
  log      =internal log           bsize=4096   blocks=95382, version=2
           =                       sectsz=512   sunit=0 blks, lazy-count=1
  realtime =none                   extsz=4096   blocks=0, rtextents=0
  bad magic number
  bad magic number
  Metadata corruption detected at xfs_sb block 0x0/0x200
  libxfs_writebufr: write verifer failed on xfs_sb bno 0x0/0x200

  The drive appears to be healthy. Firmware has been upgraded to ver
  656:

  root@arbok:~# hio_info -d /dev/hioa
  hioa    Serial number:          022XWV10G2000325
          Size(GB):               800
          Max size(GB):           800
          Hardware version:       1.0
          Firmware version:       656
          Driver version:         2.1.0.28
          Work mode:              MLC
          Run time (sec.):        8910490
          Total  read(MB):        8499
          Total write(MB):        0
          Lifetime remaining:     99.844%
          Max bad block rate:     0.167%
          Health:                 OK
          Comment:                NA

  No relevant entries about read/write errors in dmesg

  Also just copying 8G random data and reading those back gives a hash mismatch:
  root@arbok:~# dd if=/dev/urandom of=test.dat bs=1G count=8 iflag=fullblock
  8+0 records in
  8+0 records out
  8589934592 bytes (8.6 GB, 8.0 GiB) copied, 85.6076 s, 100 MB/s
  root@arbok:~# dd if=test.dat of=/dev/hioa bs=1G count=8 iflag=fullblock
  8+0 records in
  8+0 records out
  8589934592 bytes (8.6 GB, 8.0 GiB) copied, 10.6034 s, 810 MB/s
  root@arbok:~# dd if=/dev/hioa of=read-back.dat bs=1G count=8 iflag=fullblock
  sha256sum test.dat read-
  8+0 records in
  8+0 records out
  8589934592 bytes (8.6 GB, 8.0 GiB) copied, 66.1872 s, 130 MB/s
  root@arbok:~# sha256sum test.dat read-back.dat
  6376d245a07c42c990589a3c17c44e63d826d1cb583fc5a065deff9dae69fd3a  test.dat
  ebfb4ef19ae410f190327b5ebd312711263bc7579970e87d9c1e2d84e06b3c25  read-back.dat

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