Re: VFS: Unable to mount root fs on unknown-block(0,0)
On Wed, 29 Nov 2023 at 15:08, 泰宇周 wrote: > > I tried to use febootstrap to make a roofs image for qemu-kvm. > It reported that > > [1.766919] Kernel panic - not syncing: VFS: Unable to mount root fs > on unknown-block(0,0) When the kernel tells you it can't mount the root filesystem, the interesting part of the log is the part above this line, which you haven't given us. There the kernel will tell you what block devices it has found and what filesystems it tried to load them with. The problem generally is either: * wrong command line (i.e. you asked the kernel to look for the rootfs in the wrong place) * the kernel doesn't have a driver for that block device in it * the kernel doesn't have a driver for that filesystem in it In this case, you seem to be using a distro kernel. Those are generally pretty stripped down with almost all their device and filesystem drivers kept in an initrd. You haven't told QEMU to load an initrd, and the kernel doesn't have the drivers to directly mount the rootfs. You should probably try passing the initrd to QEMU as well as the kernel (-initrd argument). thanks -- PMM
access physical drive
I cannot access a physical drive. When I try to I always get this permission denied message. I also have tried to run it as administrator but won't work. $ qemu-img convert -f raw -O vhd .\\PhysicalDrive1 SDXC.vhd C:\msys64\ucrt64\bin\qemu-img.exe: Could not open '\\.\PhysicalDrive1': Could not open device: Permission denied
VFS: Unable to mount root fs on unknown-block(0,0)
I tried to use febootstrap to make a roofs image for qemu-kvm. I frist generated a roofs with command febootstrap -i coreutils -i vim centos79 centos_7.9 [url]https://mirrors.163.com/centos/7/os/x86_64/[/url] After that, I got a directory as following > tree centos_7.9/ -L 1 centos_7.9/ ├── bin -> usr/bin ├── boot ├── dev ├── etc ├── home ├── lib -> usr/lib ├── lib64 -> usr/lib64 ├── media ├── mnt ├── opt ├── proc ├── root ├── run ├── sbin -> usr/sbin ├── srv ├── sys ├── tmp ├── usr └── var Then, I created a qemu image and copied all file from centos_7.9 to the image. qemu-img create centos79.img 1g mkfs.ext4 centos79.img mkdir mnt_dir sudo mount -o loop centos79.img mnt_dir cp centos_7.9/* mnt_dir umount mnt_dir However, when I run qemu-system-x86_64 -kernel /boot/vmlinuz-`uname -r` \ -hda=centos79.img \ -append "root=/dev/sda console=ttyS0" \ -enable-kvm -nographic or qemu-system-x86_64 -kernel /boot/vmlinuz-`uname -r` \ -drive file=centos79.img \ -append "root=/dev/hda console=ttyS0" \ -enable-kvm -nographic It reported that [1.766919] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) [1.767906] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0-3.1.0.kwai+ #10 [1.767906] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.5.1 01/01/2011 [1.767906] Call Trace: [1.767906] dump_stack_lvl+0x34/0x48 [1.767906] panic+0xfb/0x2cd [1.767906] mount_block_root+0x28c/0x29f [1.767906] prepare_namespace+0x13b/0x16a [1.767906] kernel_init_freeable+0x17f/0x1a4 [1.767906] ? rest_init+0xc0/0xc0 [1.767906] kernel_init+0x16/0x130 [1.767906] ret_from_fork+0x22/0x30 [1.767906] Kernel Offset: disabled [1.767906] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) ]--- What should I do to fix this?
