Kernel I/O errors on dev sr0

Support Update
1

Since about the 10th October upgrade (but it could also be due to something else besides the upgrade!) I have the following in my kernel log:

kaisen kernel: I/O error, dev sr0, sector 4195392 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
kaisen kernel: I/O error, dev sr0, sector 4195392 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
kaisen kernel: Buffer I/O error on dev sr0, logical block 524424, async page read
kaisen kernel: I/O error, dev sr0, sector 4194304 op 0x0:(READ) flags 0x80700 phys_seg 30 prio class 0
…

Now the kernel assigns sr0 usually to a dvd or CD reader, but I have no such device on my workstation!

The system seems to have no problems; working as it should seemingly.

What is the issue there?

2

A more complete output of the journlctl -b -p 3 command:

Oct 21 03:02:40 kaisen kernel: I/O error, dev sr0, sector 4195392 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
Oct 21 03:02:40 kaisen kernel: I/O error, dev sr0, sector 4195392 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Oct 21 03:02:40 kaisen kernel: Buffer I/O error on dev sr0, logical block 524424, async page read
Oct 21 03:02:40 kaisen kernel: I/O error, dev sr0, sector 4194304 op 0x0:(READ) flags 0x80700 phys_seg 30 prio class 0
Oct 21 03:02:40 kaisen kernel: I/O error, dev sr0, sector 4194304 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Oct 21 03:02:40 kaisen kernel: Buffer I/O error on dev sr0, logical block 524288, async page read
Oct 21 03:02:40 kaisen kernel: I/O error, dev sr0, sector 4195384 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
Oct 21 03:02:40 kaisen kernel: I/O error, dev sr0, sector 4195384 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
Oct 21 03:02:40 kaisen kernel: Buffer I/O error on dev sr0, logical block 524423, async page read
Oct 21 03:02:41 kaisen kernel: rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 5-... } 6 jiffies s: 97 root: 0x20/.
Oct 21 03:02:41 kaisen kernel: rcu: blocking rcu_node structures (internal RCU debug):
Oct 21 03:02:41 kaisen nvidia-persistenced[821]: Failed to open libnvidia-cfg.so.1: libnvidia-cfg.so.1: cannot open shared object file: No such file or directory
Oct 21 03:02:41 kaisen systemd[1]: Failed to start NVIDIA Persistence Daemon.
Oct 21 03:02:46 kaisen pulseaudio[1927]: GetManagedObjects() failed: org.freedesktop.systemd1.NoSuchUnit: Unit dbus-org.bluez.service not found.
Oct 21 03:03:19 kaisen lightdm[4708]: gkr-pam: unable to locate daemon control file
Oct 21 03:03:19 kaisen pulseaudio[1927]: Error opening PCM device hdmi:1,1: Permission denied
Oct 21 03:03:19 kaisen pulseaudio[1927]: Error opening PCM device front:0: No such file or directory
Oct 21 03:03:19 kaisen pulseaudio[1927]: Error opening PCM device front:0: No such file or directory
Oct 21 03:03:20 kaisen pulseaudio[4756]: GetManagedObjects() failed: org.freedesktop.systemd1.NoSuchUnit: Unit dbus-org.bluez.service not found.
Oct 21 03:03:25 kaisen systemd[4740]: Failed to start Powerdevil.
Oct 21 03:03:26 kaisen xdg-desktop-portal[5278]: pw.conf: can't load default config client.conf: No such file or directory

Also sr0 in this case is “rom 2Gb” and not a cd or dvd drive as per lsblk:

NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
sr0           11:0   1    2G   0  rom

Yet the system seems to work without issues.

Thanks for any input. Google search did not get me very far yet, but Linux kernel is a bit beyond my skill set at this time. :slight_smile:

3

I am getting somewhere.

I have a quite old memory stick (1GB) on my system. It register correctly as sda with sda1 partition of 948M.

When I unmount it and take it off the system, it disappears from lsblk and so does sr0!

When I plug it back in, itre-appears correctly with its 948M partition, but this time so does sr0 with a size of 1.5T!

So, the issue is this memory stick, which I will try reformatting and otherwise dispose of.

Meanwhile this issue can be CLOSED and marked as SOLVED.

Sorry for wasting your time with this non Kaisen related issue.

4

Thank you for the feedback.

I close this ticket!

5