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[Bug 1580776] Re: Kernel Oops - unable to handle kernel NULL pointer dereference at 0000000000000002; IP is at mmc_ioctl_cdrom_read_audio+0x212/0x3b0
I have tested against both 4.4.0-21.37 and 4.4.0-22.39 on two laptops
with the same results.
I will test with an upstream kernel and get back to you.
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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:
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
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.
USER PID ACCESS COMMAND
/dev/snd/controlC0: dabr 2430 F.... pulseaudio
DistroRelease: Ubuntu 16.04
InstallationDate: Installed on 2016-01-29 (102 days ago)
InstallationMedia: Ubuntu-Server 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: ASUSTeK COMPUTER INC. K55VD
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=/dev/mapper/primary_lvm_volume-root ro
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
RfKill: Error: [Errno 2] No such file or directory
Uname: Linux 4.4.0-22-generic x86_64
UpgradeStatus: Upgraded to xenial on 2016-04-19 (22 days ago)
UserGroups: adm audio bumblebee cdrom dialout dip kvm lpadmin plugdev sambashare sudo video
dmi.bios.vendor: American Megatrends Inc.
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.sys.vendor: ASUSTeK COMPUTER INC.
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