Re: VFS: Cannot open root device "(null)" or unknown-block(0, 0): error -2
On Sat, Aug 14, 2021 at 6:21 PM Valdis Klētnieks wrote: > > On Fri, 13 Aug 2021 18:08:38 -0600, jim.cro...@gmail.com said: > > > then I added BTRFS_FS, since thats the host fs. > > of course it didnt work. > > > VFS: Cannot open root device "(null)" or unknown-block(0,0): error -2 > > Please append a correct "root=" boot option; here are the available > > partitions: > > Kernel panic - not syncing: VFS: Unable to mount root fs on > > unknown-block(0,0) > > CPU: 0 PID: 1 Comm: swapper Tainted: GW 5.14.0-rc4+ #5 > > And it didn't find any usable btrfs (or other fs it knew about) > > > Heres a working kernel (if overlarge config) > > > VFS: Mounted root (9p filesystem) readonly on device 0:20. > > > Anybody see any clues ? > > That '9p filesystem' should be a really big clue. If that's the root fs that > you > actually want to use, you need to do two things: > > a) point at it with root= > b) have 9p filesystem support in the kernel the part you trimmed out contained this, I think it means I had those particular modules built-in correctly 9pnet: Installing 9P2000 support sched_clock: Marking stable (3466602654, 29303733)->(4050551166, -554644779) Btrfs loaded, crc32c=crc32c-generic, zoned=no 9pnet_virtio: no channels available for device /dev/root that last line is where it skipped the track. so I really have to understand how virtme is doing its magic. fwiw, it looks like its somewhere in this command line ./.virtme_mods/lib/modules/0.0.0 /usr/bin/qemu-system-x86_64 -fsdev local,id=virtfs1,path=/,security_model=none,readonly,multidevs=remap -device virtio-9p-pci,fsdev=virtfs1,mount_tag=/dev/root -fsdev local,id=virtfs5,path=/usr/local/lib/python3.9/site-packages/virtme-0.1.1-py3.9.egg/virtme/guest,security_model=none,readonly,multidevs=remap -device virtio-9p-pci,fsdev=virtfs5,mount_tag=virtme.guesttools -machine accel=kvm:tcg -watchdog i6300esb -cpu host -parallel none -net none -echr 1 -serial none -chardev stdio,id=console,signal=off,mux=on -serial chardev:console -mon chardev=console -vga none -display none -kernel ./arch/x86/boot/bzImage -append 'virtme_link_mods=/home/jimc/projects/lx/wk-next/builds/local-i915m/.virtme_mods/lib/modules/0.0.0 earlyprintk=serial,ttyS0,115200 console=ttyS0 psmouse.proto=exps "virtme_stty_con=rows 24 cols 108 iutf8" TERM=xterm-256color rootfstype=9p rootflags=version=9p2000.L,trans=virtio,access=any,msize=200M raid=noautodetect ro nokaslr dynamic_debug.verbose=3 module.dyndbg=+pmf init=/bin/sh -- -c "mount -t tmpfs run /run;mkdir -p /run/virtme/guesttools;/bin/mount -n -t 9p -o ro,version=9p2000.L,trans=virtio,access=any,msize=104857600 virtme.guesttools /run/virtme/guesttools;exec /run/virtme/guesttools/virtme-init"' -machine dump-guest-core=on -m 2G --smp 3 Wrong EFI loader signature. early console in extract_kernel btw, I will go back and look for more 9P options. and more VIRT options thanks ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: My effort to learn Linux kernel development
https://github.com/martinezjavier/ldd3 On Fri, Aug 13, 2021 at 7:16 AM Amit Kumar wrote: > > Hi All, > Because the Linux kernel uses GCC extensions, this resource is > important for a Linux kernel learner. > https://www.gnu.org/software/gnu-c-manual/gnu-c-manual.pdf > > Regards, > Amit Kumar > > On Wed, Aug 11, 2021 at 5:07 PM Amit Kumar wrote: > > > > On Wed, Aug 11, 2021 at 3:11 PM sri vathsa wrote: > > > > > > Hi Amit, > > > > > > On Wed, Aug 11, 2021, 3:03 PM Amit Kumar > > > wrote: > > >> > > >> > > >> I have got a resource which is about 5.4 LTS kernel. > > > > > > > > > Can u share that resource here, even I trying to > > > Understand latest kernel. > > > > > Linux Kernel Programming on perlego.com > > > > Regards, > > Amit Kumar > > > Thanks, > > > Dara Srivathsa > > > > > >> ___ > > >> Kernelnewbies mailing list > > >> Kernelnewbies@kernelnewbies.org > > >> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Linux Kernel build dpkg-buildpackage error
> can't see it not working unless there is another error before this you are > not giving us. Thank you for the reply. Actually the root cause of the error was much earlier in the output. Running scripts/config --disable SYSTEM_TRUSTED_KEYS makes the kernel compiles successfully. -- Regards, Adverg Ebashinskii ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Linux Kernel build dpkg-buildpackage error
Hello! I’m trying to build Linux Kernel from upstream and faced some build error. Environment: Ubuntu 20.04 gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0 Linux Kernel 5.8.0-59-generic Steps to build: I follow the instructions specified in this site https://wiki.ubuntu.com/KernelTeam/GitKernelBuild 1 cp /boot/config-$(uname -r) .config 2 make olddefconfig 3 make clean 4 make -j $(getconf _NPROCESSORS_ONLN) deb-pkg LOCALVERSION=-custom After pretty long time of compiling source files I got the following error: make[2]: *** [debian/rules:7: build-arch] Error 2 dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2 make[1]: *** [scripts/Makefile.package:77: deb-pkg] Error 2 make: *** [Makefile:1559: deb-pkg] Error 2 Is there a way to fix that? -- Regards, Adverg Ebashinskii___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
[no subject]
Hello! I’m trying to build Linux Kernel from upstream and faced some build error. Environment: Ubuntu 20.04 gcc (Ubuntu 9.3.0-17ubuntu1~20.04) 9.3.0 Linux Kernel 5.8.0-59-generic Steps to build: I follow the instructions specified in this site https://wiki.ubuntu.com/KernelTeam/GitKernelBuild 1 cp /boot/config-$(uname -r) .config 2 make olddefconfig 3 make clean 4 make -j $(getconf _NPROCESSORS_ONLN) deb-pkg LOCALVERSION=-custom After pretty long time of compiling source files I got the following error: make[2]: *** [debian/rules:7: build-arch] Error 2 dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2 make[1]: *** [scripts/Makefile.package:77: deb-pkg] Error 2 make: *** [Makefile:1559: deb-pkg] Error 2 Is there a way to fix that? -- Regards, Adverg Ebashinskii___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Linux Kernel build dpkg-buildpackage error
Try `make -j $(getconf _NPROCESSORS_ONLN) bindeb-pkg LOCALVERSION=-custom`
Line 77 of scripts/Makefile.Package is:
`$ mv $(KDEB_SOURCENAME).tar.gz
../$(KDEB_SOURCENAME)_$${origversion}.orig.tar.gz`
which suggests it is not finding the file $(KDEB_SOURCENAME).tar.gz
debians instructions tell one to use the bindeb-pkg build target instead
of deb-pkg build target for some reason. I can't see it not working
unless there is another error before this you are not giving us.
Regards,
Ewan
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