We encountered an instance that had a nvme failure very early on in boot
today. I've updated our internal Canonical case as well as our Amazon
case on this, but posting relevant details here as well for consistency:

# uname -a
Linux XXX 4.4.0-1069-aws #79-Ubuntu SMP Mon Sep 24 15:01:41 UTC 2018 x86_64 
x86_64 x86_64 GNU/Linux

# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.5 LTS"

# echo type $EC2_INSTANCE_TYPE
type m5.xlarge

# lsblk
NAME    MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
nvme0n1 259:0    0  10G  0 disk /

# ls -al /dev/nvme* /dev/xvd* /dev/sd*
ls: cannot access '/dev/xvd*': No such file or directory
crw------- 1 root root 248, 0 Oct 31 15:02 /dev/nvme0
brw-rw---- 1 root disk 259, 0 Oct 31 15:02 /dev/nvme0n1
lrwxrwxrwx 1 root root      7 Oct 31 15:02 /dev/sda1 -> nvme0n1

# dmesg | grep '63\.'
[   63.401466] nvme 0000:00:1f.0: I/O 0 QID 0 timeout, disable controller
[   63.505790] nvme 0000:00:1f.0: Cancelling I/O 0 QID 0
[   63.505812] nvme 0000:00:1f.0: Identify Controller failed (-4)
[   63.507536] nvme 0000:00:1f.0: Removing after probe failure
[   63.507604] iounmap: bad address ffffc90001b40000
[   63.508941] CPU: 1 PID: 351 Comm: kworker/1:3 Tainted: P           O    
4.4.0-1069-aws #79-Ubuntu
[   63.508943] Hardware name: Amazon EC2 m5.xlarge/, BIOS 1.0 10/16/2017
[   63.508948] Workqueue: events nvme_remove_dead_ctrl_work [nvme]
[   63.508950]  0000000000000286 3501e2639044a4d2 ffff8800372bfce0 
ffffffff923ffe03
[   63.508952]  ffff88040dd878f0 ffffc90001b40000 ffff8800372bfd00 
ffffffff9206d3af
[   63.508954]  ffff88040dd878f0 ffff88040dd87a58 ffff8800372bfd10 
ffffffff9206d3ec
[   63.508956] Call Trace:
[   63.508961]  [<ffffffff923ffe03>] dump_stack+0x63/0x90
[   63.508965]  [<ffffffff9206d3af>] iounmap.part.1+0x7f/0x90
[   63.508967]  [<ffffffff9206d3ec>] iounmap+0x2c/0x30
[   63.508969]  [<ffffffffc039abfa>] nvme_dev_unmap.isra.35+0x1a/0x30 [nvme]
[   63.508972]  [<ffffffffc039bd1e>] nvme_remove+0xce/0xe0 [nvme]
[   63.508976]  [<ffffffff92441e0e>] pci_device_remove+0x3e/0xc0
[   63.508980]  [<ffffffff9254f654>] __device_release_driver+0xa4/0x150
[   63.508982]  [<ffffffff9254f723>] device_release_driver+0x23/0x30
[   63.508986]  [<ffffffff9243abda>] pci_stop_bus_device+0x7a/0xa0
[   63.508988]  [<ffffffff9243ad3a>] 
pci_stop_and_remove_bus_device_locked+0x1a/0x30
[   63.508990]  [<ffffffffc039a62c>] nvme_remove_dead_ctrl_work+0x3c/0x50 [nvme]
[   63.508994]  [<ffffffff9209d86b>] process_one_work+0x16b/0x490
[   63.508996]  [<ffffffff9209dbdb>] worker_thread+0x4b/0x4d0
[   63.508998]  [<ffffffff9209db90>] ? process_one_work+0x490/0x490
[   63.509001]  [<ffffffff920a3e47>] kthread+0xe7/0x100
[   63.509005]  [<ffffffff92823301>] ? __schedule+0x301/0x7f0
[   63.509007]  [<ffffffff920a3d60>] ? kthread_create_on_node+0x1e0/0x1e0
[   63.509009]  [<ffffffff92827e35>] ret_from_fork+0x55/0x80
[   63.509011]  [<ffffffff920a3d60>] ? kthread_create_on_node+0x1e0/0x1e0
[   63.509013] Trying to free nonexistent resource 
<00000000febf8000-00000000febfbfff>

# modinfo nvme
filename:       /lib/modules/4.4.0-1069-aws/kernel/drivers/nvme/host/nvme.ko
version:        1.0
license:        GPL
author:         Matthew Wilcox <wi...@linux.intel.com>
srcversion:     5CF522443B009A8675C497B
alias:          pci:v0000106Bd00002001sv*sd*bc*sc*i*
alias:          pci:v*d*sv*sd*bc01sc08i02*
alias:          pci:v0000144Dd0000A822sv*sd*bc*sc*i*
alias:          pci:v0000144Dd0000A821sv*sd*bc*sc*i*
alias:          pci:v00001C58d00000003sv*sd*bc*sc*i*
alias:          pci:v00008086d00005845sv*sd*bc*sc*i*
alias:          pci:v00008086d0000F1A5sv*sd*bc*sc*i*
alias:          pci:v00008086d00000953sv*sd*bc*sc*i*
depends:        
retpoline:      Y
intree:         Y
vermagic:       4.4.0-1069-aws SMP mod_unload modversions retpoline 
parm:           admin_timeout:timeout in seconds for admin commands (uint)
parm:           io_timeout:timeout in seconds for I/O (uint)
parm:           shutdown_timeout:timeout in seconds for controller shutdown 
(byte)
parm:           use_threaded_interrupts:int
parm:           use_cmb_sqes:use controller's memory buffer for I/O SQes (bool)
parm:           nvme_major:int
parm:           nvme_char_major:int
parm:           default_ps_max_latency_us:max power saving latency for new 
devices; use PM QOS to change per device (ulong)

# systool -m nvme -va
Module = "nvme"

  Attributes:
    coresize            = "65536"
    initsize            = "0"
    initstate           = "live"
    refcnt              = "1"
    srcversion          = "5CF522443B009A8675C497B"
    taint               = ""
    uevent              = <store method only>
    version             = "1.0"

  Parameters:
    admin_timeout       = "60"
    default_ps_max_latency_us= "100000"
    io_timeout          = "4294967295"
    shutdown_timeout    = "5"
    use_cmb_sqes        = "Y"

  Sections:
    .bss                = "0xffffffffc03a3780"
    .data               = "0xffffffffc03a3000"
    .data.unlikely      = "0xffffffffc03a33d8"
    .exit.text          = "0xffffffffc03a0cea"
    .gnu.linkonce.this_module= "0xffffffffc03a3400"
    .init.text          = "0xffffffffc03a8000"
    .note.gnu.build-id  = "0xffffffffc03a1000"
    .parainstructions   = "0xffffffffc03a1b88"
    .rodata             = "0xffffffffc03a1060"
    .rodata.str1.1      = "0xffffffffc03a2349"
    .rodata.str1.8      = "0xffffffffc03a1d78"
    .smp_locks          = "0xffffffffc03a1b28"
    .strtab             = "0xffffffffc03abb08"
    .symtab             = "0xffffffffc03a9000"
    .text               = "0xffffffffc0397000"
    __bug_table         = "0xffffffffc03a2be0"
    __kcrctab_gpl       = "0xffffffffc03a1040"
    __ksymtab_gpl       = "0xffffffffc03a1030"
    __ksymtab_strings   = "0xffffffffc03a25d3"
    __mcount_loc        = "0xffffffffc03a2730"
    __param             = "0xffffffffc03a25f0"

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https://bugs.launchpad.net/bugs/1788035

Title:
  nvme: avoid cqe corruption

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  Fix Released

Bug description:
  To address customer-reported NVMe issue with instance types (notably
  c5 and m5) that expose EBS volumes as NVMe devices, this commit from
  mainline v4.6 should be backported to Xenial:

  d783e0bd02e700e7a893ef4fa71c69438ac1c276 nvme: avoid cqe corruption
  when update at the same time as read

  dmesg sample:

  [Wed Aug 15 01:11:21 2018] nvme 0000:00:1f.0: I/O 8 QID 1 timeout, aborting
  [Wed Aug 15 01:11:21 2018] nvme 0000:00:1f.0: I/O 9 QID 1 timeout, aborting
  [Wed Aug 15 01:11:21 2018] nvme 0000:00:1f.0: I/O 21 QID 2 timeout, aborting
  [Wed Aug 15 01:11:32 2018] nvme 0000:00:1f.0: I/O 10 QID 1 timeout, aborting
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: I/O 8 QID 1 timeout, reset 
controller
  [Wed Aug 15 01:11:51 2018] nvme nvme1: Abort status: 0x2
  [Wed Aug 15 01:11:51 2018] nvme nvme1: Abort status: 0x2
  [Wed Aug 15 01:11:51 2018] nvme nvme1: Abort status: 0x2
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 21 QID 2
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: completing aborted command with 
status: 0007
  [Wed Aug 15 01:11:51 2018] blk_update_request: I/O error, dev nvme1n1, sector 
83887751
  [Wed Aug 15 01:11:51 2018] blk_update_request: I/O error, dev nvme1n1, sector 
83887751
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 22 QID 2
  [Wed Aug 15 01:11:51 2018] blk_update_request: I/O error, dev nvme1n1, sector 
83887767
  [Wed Aug 15 01:11:51 2018] blk_update_request: I/O error, dev nvme1n1, sector 
83887767
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 23 QID 2
  [Wed Aug 15 01:11:51 2018] blk_update_request: I/O error, dev nvme1n1, sector 
83887769
  [Wed Aug 15 01:11:51 2018] blk_update_request: I/O error, dev nvme1n1, sector 
83887769
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 8 QID 1
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 9 QID 1
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: completing aborted command with 
status: 0007
  [Wed Aug 15 01:11:51 2018] blk_update_request: I/O error, dev nvme1n1, sector 
41943136
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 10 QID 1
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: completing aborted command with 
status: 0007
  [Wed Aug 15 01:11:51 2018] blk_update_request: I/O error, dev nvme1n1, sector 
6976
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 22 QID 1
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 23 QID 1
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 24 QID 1
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 25 QID 1
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: Cancelling I/O 2 QID 0
  [Wed Aug 15 01:11:51 2018] nvme nvme1: Abort status: 0x7
  [Wed Aug 15 01:11:51 2018] nvme 0000:00:1f.0: completing aborted command with 
status: fffffffc
  [Wed Aug 15 01:11:51 2018] blk_update_request: I/O error, dev nvme1n1, sector 
96
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): metadata I/O error: block 0x5000687 
("xlog_iodone") error 5 numblks 64
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): xfs_do_force_shutdown(0x2) called 
from line 1197 of file /build/linux-c2Z51P/linux-4.4.0/fs/xfs/xfs_log.c. Return 
address = 0xffffffffc075d428
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): xfs_log_force: error -5 returned.
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): Log I/O Error Detected. Shutting 
down filesystem
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): Please umount the filesystem and 
rectify the problem(s)
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
872, lost async page write
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): xfs_imap_to_bp: 
xfs_trans_read_buf() returned error -5.
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): xfs_iunlink_remove: xfs_imap_to_bp 
returned error -5.
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
873, lost async page write
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
874, lost async page write
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
875, lost async page write
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
876, lost async page write
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
877, lost async page write
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
878, lost async page write
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
879, lost async page write
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
880, lost async page write
  [Wed Aug 15 01:11:51 2018] Buffer I/O error on dev nvme1n1, logical block 
881, lost async page write
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): metadata I/O error: block 0x5000697 
("xlog_iodone") error 5 numblks 64
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): xfs_log_force: error -5 returned.
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): xfs_do_force_shutdown(0x2) called 
from line 1197 of file /build/linux-c2Z51P/linux-4.4.0/fs/xfs/xfs_log.c. Return 
address = 0xffffffffc075d428
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): metadata I/O error: block 0x5000699 
("xlog_iodone") error 5 numblks 64
  [Wed Aug 15 01:11:51 2018] XFS (nvme1n1): xfs_do_force_shutdown(0x2) called 
from line 1197 of file /build/linux-c2Z51P/linux-4.4.0/fs/xfs/xfs_log.c. Return 
address = 0xffffffffc075d428
  [Wed Aug 15 01:12:20 2018] XFS (nvme1n1): xfs_log_force: error -5 returned.
  [Wed Aug 15 01:12:22 2018] nvme 0000:00:1f.0: I/O 22 QID 1 timeout, aborting
  [Wed Aug 15 01:12:22 2018] nvme 0000:00:1f.0: I/O 23 QID 1 timeout, aborting
  [Wed Aug 15 01:12:22 2018] nvme 0000:00:1f.0: I/O 24 QID 1 timeout, aborting
  [Wed Aug 15 01:12:22 2018] nvme 0000:00:1f.0: I/O 25 QID 1 timeout, aborting
  [Wed Aug 15 01:12:22 2018] nvme 0000:00:1f.0: I/O 24 QID 2 timeout, aborting
  [Wed Aug 15 01:12:22 2018] nvme nvme1: Abort status: 0x2
  [Wed Aug 15 01:12:22 2018] nvme nvme1: Abort status: 0x2
  [Wed Aug 15 01:12:22 2018] nvme nvme1: Abort status: 0x2
  [Wed Aug 15 01:12:22 2018] nvme nvme1: Abort status: 0x2
  [Wed Aug 15 01:12:22 2018] nvme nvme1: Abort status: 0x2
  [Wed Aug 15 01:12:50 2018] XFS (nvme1n1): xfs_log_force: error -5 returned.
  [Wed Aug 15 01:12:52 2018] nvme 0000:00:1f.0: I/O 22 QID 1 timeout, reset 
controller
  [Wed Aug 15 01:13:21 2018] XFS (nvme1n1): xfs_log_force: error -5 returned.
  [Wed Aug 15 01:13:51 2018] XFS (nvme1n1): xfs_log_force: error -5 returned.
  [Wed Aug 15 01:14:21 2018] XFS (nvme1n1): xfs_log_force: error -5 returned.

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