kernel-packages team mailing list archive

[Dan Streetman <dan.streetman@xxxxxxxxxxxxx>]

Well, yes I agree, it does look like the serial port causing the
softlockup is probably separate - but caused by - the nbd closed socket
errors.  However, the serial port output definitely shouldn't be causing
a softlockup - no matter how much data it has to send, the serial port
driver in the kernel should be scheduling itself during operation, so
that it doesn't hog a single cpu for a long time.  It's more likely that
the general system "freezing" you are seeing is due to the serial port
driver refusing to schedule off its cpu, and not any problem with the
nbdX failure.

I'll look into the nbd code also though, to see where that error is
coming from and what that problem may be.

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https://bugs.launchpad.net/bugs/1505564

Title:
  Soft lockup with "block nbdX: Attempted send on closed socket" spam

Status in linux package in Ubuntu:
  In Progress

Bug description:
  Some of our nova compute hosts regularly freeze, sometimes for a few
  hours, with kern.log getting spammed with:

  block nbdX: Attempted send on closed socket

  and a few "CPU soft lockup" messages (see attached log). This clears
  up when the queue gets cleared, eg :

  block nbdX: queue cleared

  trusty hosts with kernel version 3.19.0-30-generic.
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Nov 24 12:23 seq
   crw-rw---- 1 root audio 116, 33 Nov 24 12:23 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 14.04
  IwConfig: Error: [Errno 2] No such file or directory
  MachineType: HP ProLiant DL385 G7
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=screen-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-36-generic root=UUID=13289ac9-8dc9-4feb-b6bd-ca7db66b21d6 ro console=tty0 console=ttyS1,38400 nosplash crashkernel=384M-:512M nox2apic intremap=off
  ProcVersionSignature: Ubuntu 3.19.0-36.41~14.04.1hf00090138v20151122b1-generic 3.19.8-ckt9
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-36-generic N/A
   linux-backports-modules-3.19.0-36-generic  N/A
   linux-firmware                             1.127.18
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty uec-images
  Uname: Linux 3.19.0-36-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 02/02/2014
  dmi.bios.vendor: HP
  dmi.bios.version: A18
  dmi.chassis.type: 23
  dmi.chassis.vendor: HP
  dmi.modalias: dmi:bvnHP:bvrA18:bd02/02/2014:svnHP:pnProLiantDL385G7:pvr:cvnHP:ct23:cvr:
  dmi.product.name: ProLiant DL385 G7
  dmi.sys.vendor: HP

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