[Bug 1931886] [NEW] show-regs can cause some samsung controllers to go offline

[dann frazier]

Public bug reported:

[Impact]
nvme show-regs has been found to cause certain Samsung controllers
(MZ1L21T9HCLS in particular) to go offline.

[Test Case]
Run `nvme show-regs` on an effected controller device. Messages similar to this will appear in dmesg:
[963314.311332] nvme nvme2: controller is down; will reset: CSTS=0x3, PCI_STATUS=0x10
[963334.951328] nvme nvme2: Device not ready; aborting reset
[963334.963114] nvme nvme2: Removing after probe failure status: -19
[963334.999600] blk_update_request: I/O error, dev nvme2n1, sector 1050640 op 0x1:(WRITE) flags 0x800 phys_seg 1 prio class 0
[963335.023410] md: super_written gets error=10
[963335.033842] md/raid1:md0: Disk failure on nvme2n1p2, disabling device.
                md/raid1:md0: Operation continuing on 1 devices.
[  +0.009599] XFS (md127): log I/O error -5
[  +0.015136] XFS (md127): xfs_do_force_shutdown(0x2) called from line 1250 of file fs/xfs/xfs_log.c. Return address = 00000000d0ea8129
[  +0.000001] XFS (md127): Log I/O Error Detected. Shutting down filesystem
[  +0.009290] XFS (md127): Please unmount the filesystem and rectify the problem(s)

[Fix]
This has been fixed upstream with the following commits:
  https://github.com/linux-nvme/nvme-cli/commit/33e60ff64a043b189d2661543b417b21b6f3667b
  https://github.com/linux-nvme/nvme-cli/commit/d43d545a68cc6cea5ac78fda4edeedf3b5198847

[What Could Go Wrong]

** Affects: nvme-cli (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: nvme-cli (Ubuntu Groovy)
     Importance: Undecided
         Status: New

** Affects: nvme-cli (Ubuntu Hirsute)
     Importance: Undecided
         Status: New

** Affects: nvme-cli (Ubuntu Impish)
     Importance: Undecided
         Status: New

** Affects: nvme-cli (Debian)
     Importance: Unknown
         Status: Unknown

** Also affects: nvme-cli (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: nvme-cli (Ubuntu Hirsute)
   Importance: Undecided
       Status: New

** Also affects: nvme-cli (Ubuntu Impish)
   Importance: Undecided
       Status: New

** Bug watch added: Debian Bug tracker #989840
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989840

** Also affects: nvme-cli (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=989840
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1931886

Title:
  show-regs can cause some samsung controllers to go offline

Status in nvme-cli package in Ubuntu:
  New
Status in nvme-cli source package in Groovy:
  New
Status in nvme-cli source package in Hirsute:
  New
Status in nvme-cli source package in Impish:
  New
Status in nvme-cli package in Debian:
  Unknown

Bug description:
  [Impact]
  nvme show-regs has been found to cause certain Samsung controllers
  (MZ1L21T9HCLS in particular) to go offline.

  [Test Case]
  Run `nvme show-regs` on an effected controller device. Messages similar to this will appear in dmesg:
  [963314.311332] nvme nvme2: controller is down; will reset: CSTS=0x3, PCI_STATUS=0x10
  [963334.951328] nvme nvme2: Device not ready; aborting reset
  [963334.963114] nvme nvme2: Removing after probe failure status: -19
  [963334.999600] blk_update_request: I/O error, dev nvme2n1, sector 1050640 op 0x1:(WRITE) flags 0x800 phys_seg 1 prio class 0
  [963335.023410] md: super_written gets error=10
  [963335.033842] md/raid1:md0: Disk failure on nvme2n1p2, disabling device.
                  md/raid1:md0: Operation continuing on 1 devices.
  [  +0.009599] XFS (md127): log I/O error -5
  [  +0.015136] XFS (md127): xfs_do_force_shutdown(0x2) called from line 1250 of file fs/xfs/xfs_log.c. Return address = 00000000d0ea8129
  [  +0.000001] XFS (md127): Log I/O Error Detected. Shutting down filesystem
  [  +0.009290] XFS (md127): Please unmount the filesystem and rectify the problem(s)

  [Fix]
  This has been fixed upstream with the following commits:
    https://github.com/linux-nvme/nvme-cli/commit/33e60ff64a043b189d2661543b417b21b6f3667b
    https://github.com/linux-nvme/nvme-cli/commit/d43d545a68cc6cea5ac78fda4edeedf3b5198847

  [What Could Go Wrong]

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