[Bug 651388] [NEW] Missing console output

[Scott Moser]

Public bug reported:

I saw this strange behavior today when running maverick RC tests.
*Some* console output would be missing, when other surrounding evidence indicates that it was written.

>From previous discussion with kernel team, I believe that this might be
related to bug 554172.  However, I understood that bug to be exposed
when all file descriptors for /dev/console were closed.  Here, I see
some output of a single shell script to the console and other data lost.

I saw missing data 3 times:
* ud-multipart-01 test failure (ami-42164607 i386 m1.small)
  Test case reports "FAIL: not found in console: HELLO RC.LOCAL LIKE WORLD"
  The investigating the remote test logs, the file writen by this
  script did exist, so the job *did* run.  The job writes the file
  by tee'ing output to it, so output goes to stdout (/dev/console) and file
  but the stdout content did not get to the console.

  attachment file is console-ud-multipart.txt

* "BEGIN SSH" but no "END SSH" (ami-cc6e9ba5 x86_64 m1.large)
  This console had no 'BEGIN SSH' in its console output, but *did*
  have "END SSH".  Both are written by the same /bin/sh process and
  should find their way to the console through a pipe to 'logger -s' [1].
  For example:
  { echo 1; echo 2; ssh-keygen; echo 3; } | logger -s -t ec2:

  attachment file is console-begin-no-end.txt

* "END SSH" but no "BEGIN SSH" 
  Similar to above, but this console only had 'END' with no 'BEGIN'

  attachment file is console-end-no-begin.txt

--
[1] http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/annotate/head%3A/cloudinit/CloudConfig/cc_ssh.py

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-22-virtual 2.6.35-22.33
Regression: No
Reproducible: No
ProcVersionSignature: User Name 2.6.35-22.33-virtual 2.6.35.4
Uname: Linux 2.6.35-22-virtual i686
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory
Architecture: i386
ArecordDevices: Error: [Errno 2] No such file or directory
CurrentDmesg: [   12.796323] eth0: no IPv6 routers present
Date: Wed Sep 29 18:24:38 2010
Ec2AMI: ami-42164607
Ec2AMIManifest: ubuntu-images-testing-us-west-1/ubuntu-maverick-daily-i386-server-20100928.4.manifest.xml
Ec2AvailabilityZone: us-west-1b
Ec2InstanceType: m1.small
Ec2Kernel: aki-99a0f1dc
Ec2Ramdisk: unavailable
Frequency: Once every few days.
Lspci:
 
Lsusb: Error: command ['lsusb'] failed with exit code 1:
ProcCmdLine: root=LABEL=uec-rootfs ro console=hvc0
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcModules: acpiphp 17239 0 - Live 0xedc11000
SourcePackage: linux

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: New


** Tags: apport-bug ec2-images i386 iso-testing kernel-uncat maverick needs-upstream-testing

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Missing console output
https://bugs.launchpad.net/bugs/651388
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