Problem solution

Microsoft Edge¶

Problem¶

sigma_ibo@sigma-ibo:~$ microsoft-edge
[9283:9283:0402/093408.731168:ERROR:process_singleton_posix.cc(359)] This profile appears to be in use by another Microsoft Edge process (2953) on another computer (localhost.localdomain). Microsoft Edge has locked this profile to prevent corruption. If you're sure no other processes are using this profile, you can unlock it and relaunch Microsoft Edge.
[9283:9283:0402/093408.731251:ERROR:message_box_dialog.cc(147)] Unable to show a dialog outside the UI thread message loop: Microsoft Edge - This profile appears to be in use by another Microsoft Edge process (2953) on another computer (localhost.localdomain). Microsoft Edge has locked this profile to prevent corruption. If you're sure no other processes are using this profile, you can unlock it and relaunch Microsoft Edge.

Solution¶

Delete SingletonLock in /home/sigma_ibo/.config/microsoft-edge

Yocto¶

Problem 1¶

File://0001.patch error

Unable to find file file://0001-Fix.patch

Solution 1¶

cd meta-sigmatek/
git branch
code ../meta-sigmatek/
gitk
git rebase origin/master
git checkout master
git reset --hard
git checkout master
git pull
git fetch
git branch
git branch -D pamhal/virtualization
git branch
git pull
git fetch
git branch pamhal/virtual_master
git checkout pamhal/virtual_master
git branch
git status
git add recipes-kernel/stek-common/files/x86-64/defconfig
git commit
git push
git push --set-upstream origin pamhal/virtual_master
git branch
git pull
code .
cd salamander/salamander-core2
../init.sh -b build -m sigmatek-core2 -d salamander
bitbake salamander-image -k

Problem 2¶

ERROR: salamander-image-1.0-r0 do_rootfs: Unable to install packages. Command '/home/sigma_ibo/Develop/Yocto_local/salamander/salamander-core2/build/tmp/work/sigmatek_core2-sigmatek-linux/salamander-image/1.0-r0/recipe-sysroot-native/usr/bin/opkg --volatile-cache -f /home/sigma_ibo/Develop/Yocto_local/salamander/salamander-core2/build/tmp/work/sigmatek_core2-sigmatek-linux/salamander-image/1.0-r0/opkg.conf -t /home/sigma_ibo/Develop/Yocto_local/salamander/salamander-core2/build/tmp/work/sigmatek_core2-sigmatek-linux/salamander-image/1.0-r0/temp/ipktemp/ -o /home/sigma_ibo/Develop/Yocto_local/salamander/salamander-core2/build/tmp/work/sigmatek_core2-sigmatek-linux/salamander-image/1.0-r0/rootfs  --force_postinstall --prefer-arch-to-version --no-install-recommends  --force-maintainer --force-overwrite install cups-locale-en lib32-cups-locale-en' returned 255:
 * opkg_prepare_url_for_install: Couldn't find anything to satisfy 'lib32-cups-locale-en'.

ERROR: Logfile of failure stored in: /home/sigma_ibo/Develop/Yocto_local/salamander/salamander-core2/build/tmp/work/sigmatek_core2-sigmatek-linux/salamander-image/1.0-r0/temp/log.do_rootfs.76045
ERROR: Task (/home/sigma_ibo/Develop/Yocto_local/salamander/meta-sigmatek/recipes-sigmatek/images/salamander-image.bb:do_rootfs) failed with exit code '1'

Solution 2¶

bitbake -c do_cleanall lib32-cups

Trace-cmd¶

After following Rostedt Tutorial, I had following problems when using:

sudo trace-cmd record -e kvm:kvm_entry -e kvm:kvm_exit -A @3:823 --name Salamander4 -e all

Problem 1¶

"Failed to negotiate timestamps synchronization with the host" timestamp_error.png

Problem 2¶

"Cannot find host / guest tracing into the loaded streams" kvm_combo_error.png

Solution¶

The problem was the trace-cmd version. Set both host and guest to v3.2.0 by copying the files from host to guest:

scp /usr/local/bin/trace-cmd root@"$ip_address":/usr/bin
scp /usr/local/lib64/libtracefs.so.1 root@"$ip_address":/lib64
scp /usr/local/lib64/libtraceevent.so.1 root@"$ip_address":/lib64

Now, trace-cmd version 3.2.0 is active and tracing the guest finally works with trace-cmd agent on the guest.

Using kernelshark with kernelshark trace.dat -a trace-Salamander4.dat or simply ./start_kernelshark.sh, we get the expected visualization. Events of the guest happen between kvm_entry and kvm_exit of the host.

bcc¶

Problem 1¶

Unable to find clang libraries

sigma_ibo@sigma-ibo:~/Desktop/latency/bcc/build$ cmake ..
-- Latest recognized Git tag is v0.30.0
-- Git HEAD is 6a5602cef2ebd97c351554d53a4f95532db6a568
-- Revision is 0.30.0+6a5602ce (major 0, minor 30, patch 0)
-- Kernel release: 6.5.0-26-generic
-- Kernel headers: /usr/src/linux-headers-6.5.0-26-generic
-- Found LLVM: /usr/lib/llvm-14/include 14.0.0 (Use LLVM_ROOT envronment variable for another version of LLVM)
CMake Error at CMakeLists.txt:173 (message):
  Unable to find clang libraries


-- Configuring incomplete, errors occurred!
See also "/home/sigma_ibo/Desktop/latency/bcc/CMakeFiles/CMakeOutput.log".

Solution 1¶

sudo apt install libclang-dev

Source

Problem 2¶

It seems that the library is trying to access the symbol bpf_module_create_b in the shared library libbcc.so.0, but it can’t find it.

root@sigma-ibo:/usr/share/bcc/tools# sudo ./kvmexit
Traceback (most recent call last):
  File "/usr/share/bcc/tools/./kvmexit", line 32, in <module>
    from bcc import BPF
  File "/usr/lib/python3/dist-packages/bcc/__init__.py", line 27, in <module>
    from .libbcc import lib, bcc_symbol, bcc_symbol_option, bcc_stacktrace_build_id, _SYM_CB_TYPE
  File "/usr/lib/python3/dist-packages/bcc/libbcc.py", line 20, in <module>
    lib.bpf_module_create_b.restype = ct.c_void_p
  File "/usr/lib/python3.10/ctypes/__init__.py", line 387, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib/python3.10/ctypes/__init__.py", line 392, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /lib/x86_64-linux-gnu/libbcc.so.0: undefined symbol: bpf_module_create_b

Solution 2¶

sudo rm -fr /usr/lib/python3/dist-packages/bcc
cd /usr/share/bcc/tools && sudo ./kvmexit

Source

QEMU¶

Problem¶

$ sudo ./qemu_def.sh 
failed to parse default acl file `/etc/qemu/bridge.conf'
qemu-system-x86_64: -netdev bridge,id=e1000,br=nm-bridge: bridge helper failed

Solution¶

sudo mkdir /etc/qemu && cd /etc/qemu 
echo "allow nm-bridge" | sudo tee bridge.conf > /dev/null

Kernel Patch¶

Problem 1¶

Fully Preemptible Kernel (RT) not showing up in menuconfig

Solution 1¶

1) Run make mrproper
2) Then run make menuconfig

This is the output
Source

OR

In arch/Kconfig, search for the entry: ARCH_SUPPORTS_RT.

Change the entry from

config ARCH_SUPPORTS_RT
    bool

to

config ARCH_SUPPORTS_RT
    def_bool y

When you now also have the EXPERT (General Setup -> Embedded System) flag enabled you should see the option Fully Preemptible Kernel (Real-Time) under General Setup -> Preemption Model.

Source

Problem 2¶

No rule to make target 'debian/canonical-certs.pem'

Solution 2¶

If you get the certificate error, execute the following in the root of the kernel source

scripts/config --disable SYSTEM_TRUSTED_KEYS
scripts/config --disable SYSTEM_REVOCATION_KEYS

Then run make again and it should work!
Source

Lasal Class 2 Virtualization¶

Problem 1¶

Varan Manager Error when connecting to virtualization and VI and PW022. No Voltage output

Solution 1¶

Tools > Advanced Debug Tools > Remote CLI
set maintimer 10000
VaranManagerTime = 10000000

Problem 2¶

DMA Error

Solution 2¶

PayloadFrame = 2