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["Jason M." <jason-ubuntu@xxxxxxxxx>]

I have the same problem with two  Crucial 1TB M550s:

 [    4.094763] ata4.00: ATA-9: Crucial_CT1024M550SSD1, MU01, max UDMA/133
 [    4.095063] ata3.00: ATA-9: Crucial_CT1024M550SSD1, MU01, max UDMA/133

and have suffered data-loss in a RAID1 config that required a reinstall.
I also see the errors on my two other Intel SSDs:

 [    4.096849] ata2.00: ATA-9: INTEL SSDSC2BW120A4, DC32, max UDMA/133
 [    4.097088] ata1.00: ATA-9: INTEL SSDSC2BW120A4, DC32, max UDMA/133

however the Intel SSDs do not seem to have suffered data loss.  A sample
error from syslog, on one of the Intel SSDs:

 [1767684.772447] ata1.00: exception Emask 0x1 0 SAct 0x10 SErr 0x480100 action 0x6 frozen
 [1767684.772456] ata1.00: irq_stat 0x08000000, interface fatal error
 [1767684.772462] ata1: SError: { UnrecovData 10B8B Handshk }
 [1767684.772469] ata1.00: failed command: WRITE FPDMA QUEUED
 [1767684.772479] ata1.00: cmd 61/b0:20:a8:a0:bf/03:00:04:00:00/40 tag 4 ncq 483328 out
 [1767684.772479]                  res 40/00:20:a8:a0:bf/00:00:04:00:00/40 Emask 0x10 (ATA bus error)
 [1767684.772484] ata1.00: status: { DRDY }
 [1767684.772492] ata1: hard resetting link
 [1767685.088404] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
 [1767685.129320] ata1.00: configured for UDMA/133
 [1767685.129339] ata1: EH complete

The motherboard is a Gigabyte H87N w/  SATA controller: Intel
Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1
[AHCI mode] (rev 05).  The lspci is attached.

uname -rv:  3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:30:27 UTC 2014
lsb_release -d: Description:	Ubuntu 14.04.1 LTS

Adding libata.force=noncq to
/etc/default/grub:GRUB_CMDLINE_LINUX_DEFAULT has stopped the errors for
the last 5-days, and there have been no spontaneous RAID1 resyncs.

** Attachment added: "lspci.txt"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1363462/+attachment/4264136/+files/lspci.txt

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https://bugs.launchpad.net/bugs/1363462

Title:
  Crucial M550 1TB SSD missing from NCQ TRIM blacklist

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I own a Crucial/Micron M550 1TB SSD which does has data loss when using NCQ TRIM.
  The current Ubuntu Trusty kernel has a blacklist which matches all M550 SSDs except the 1024 GB (1 TB) version because the matching pattern is limited to 3 digits for size. Upstream Linux has fixed this bug already:

  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a13772a144d2956a7fedd18685921d0a9b8b783

  Please try to get this merged and tell me where I can start an
  installation with a fixed kernel so I won't have a corrupt disk
  already on the end of the installation. Thanks!

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