[s390x] /dev/hwrng present, yet not usable

[Dimitri John Ledkov]

[s390x] /dev/hwrng present, yet not usable

# cat /dev/hwrng
cat: /dev/hwrng: No such device

# ls -latr /dev/hwrng
crw------- 1 root root 10, 183 Mar 8 10:28 /dev/hwrng

# modprobe ap
modprobe: ERROR: could not insert 'ap': No such device

# lszcrypt -VV
lszcrypt: error - cryptographic device driver zcrypt is not loaded!

a) permissions should be more liberal on /dev/hwrng
b) /dev/hwrng probably should not be there, when not actually available... (as per above there is no hwrng card available on the system yet the device is present and is totally unusable)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-11-generic 4.4.0-11.26
ProcVersionSignature: Ubuntu 4.4.0-11.26-generic 4.4.4
Uname: Linux 4.4.0-11-generic s390x
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: 'aplay'
ApportVersion: 2.20-0ubuntu3
Architecture: s390x
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
Date: Tue Mar 8 15:30:51 2016
HibernationDevice: RESUME=/dev/mapper/group0-swap
Lspci:

Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:

ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
ProcKernelCmdLine: root=/dev/mapper/group0-rootfs BOOT_IMAGE=0
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-11-generic N/A
 linux-backports-modules-4.4.0-11-generic N/A
 linux-firmware 1.156
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1554498

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Dimitri John Ledkov (xnox)]

@brad-figg

How can this bug report be missing log files, if it was filed with ubuntu-bug?

[Tim Gardner (timg-tpi)]

Dimitri - can you modprobe virtio-rng ?

[Dimitri John Ledkov (xnox)]

@tim

Sure, however that makes zero sense here, as this is not a KVM virtual machine. It is a z/VM - which for linux purposes has little differences from an LPAR.

I can load and unload virtio-rng module.
With or without virtio-rng module there is still /dev/hwrng, and still unusable.