[Fedora][libata][4.4-rc0/rc1] Disk cache/write error? - FLUSH CACHE EXT / WRITE FPDMA QUEUED

[Shawn Starr <shawn.starr@rogers.com>]

Hello devs,

Something unusual happened today, disk locked up, went into bad state, 
rebooted with sysctl magic key, BIOS reported disk showed no OS found, hard 
powered off machine then everything was normal.

Any changes recently in libata that might have caused the disk to perform a 
bad operation?

SMART reports no faults in tests (Will perform long test later), I don't 
suspect disk failure (231 days, not rollover counter)

kernel: 4.4.0-0.rc0.git9.2.fc24.x86_64
Filesystem: EXT4, options: noatime,nodiratime

Boot command line:

BOOT_IMAGE=/boot/vmlinuz-4.4.0-0.rc0.git9.2.fc24.x86_64 
root=UUID=f834b05c-55f3-407b-9a63-fc6b04d4c845 ro rhgb slub_debug=- 
cgroup_disable=memory console=tty0 console=ttyS0,115200n8 nmi_watchdog=0 
video=LVDS-1:d video=VGA-0:e audit=0 radeon.gartsize=8192 intel_iommu=igfx_off 
radeon.lockup_timeout=0 radeon.vm_size=16 rd.driver.blacklist=dell_rbtn 
LANG=en_US.UTF-8

Laptop: Dell Precision M6800
BIOS: Version A15 

Controller: 00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA 
Controller [RAID mode] (rev 04)


SMART Log:

Error 1 occurred at disk power-on lifetime: 5559 hours (231 days + 15 hours)
  When the command that caused the error occurred, the device was active or 
idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  04 71 03 80 04 11 e0

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  ea 00 00 00 00 00 a0 00      02:59:36.641  FLUSH CACHE EXT
  61 00 88 ff ff ff 4f 00      02:59:36.641  WRITE FPDMA QUEUED
  61 00 30 ff ff ff 4f 00      02:59:36.640  WRITE FPDMA QUEUED
  61 00 20 ff ff ff 4f 00      02:59:35.952  WRITE FPDMA QUEUED
  61 00 90 ff ff ff 4f 00      02:59:35.952  WRITE FPDMA QUEUED

Thanks,
Shawn