kernel-packages team mailing list archive

[Dave Brown <d.brown@xxxxxxxxxxxxxx>]

Public bug reported:

While playing around with the CDROM API found in linux/cdrom.h I
encountered a kernel oops when my program stalls.  My code can be found
at https://github.com/bigdavedev/audiorip.

My program simply examines the ToC and then begins reading the PCM data
track-by-track.  I would expect it to complete without any major issue

At first I assumed it was the CD, but after switching CDs several times
I noticed that the oops happens at around frame 170925, reading
CD_FRAMES (75) per ioctl.  At this point, the disc is spinning at full
speed.  I have not yet tried reading fewer frames, nor have I tried
setting the speed to something not max to see if I still receive a
kernel oops.  This would not be problematic to try.

I have attached the output from `ubuntu-bug linux` to this issue.

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

** Attachment added: "apport.linux-image-4.4.0-22-generic.zuaa6zc0.apport"
   https://bugs.launchpad.net/bugs/1580776/+attachment/4660923/+files/apport.linux-image-4.4.0-22-generic.zuaa6zc0.apport

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https://bugs.launchpad.net/bugs/1580776

Title:
  Kernel Oops - unable to handle kernel NULL pointer dereference at
  0000000000000002; IP is at  mmc_ioctl_cdrom_read_audio+0x212/0x3b0

Status in linux package in Ubuntu:
  New

Bug description:
  While playing around with the CDROM API found in linux/cdrom.h I
  encountered a kernel oops when my program stalls.  My code can be
  found at https://github.com/bigdavedev/audiorip.

  My program simply examines the ToC and then begins reading the PCM
  data track-by-track.  I would expect it to complete without any major
  issue

  At first I assumed it was the CD, but after switching CDs several
  times I noticed that the oops happens at around frame 170925, reading
  CD_FRAMES (75) per ioctl.  At this point, the disc is spinning at full
  speed.  I have not yet tried reading fewer frames, nor have I tried
  setting the speed to something not max to see if I still receive a
  kernel oops.  This would not be problematic to try.

  I have attached the output from `ubuntu-bug linux` to this issue.

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