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During my attempt to install the Raspberry Pi 64bit OS on my Compute Module 4 Rev 1.0, I came across this issue.

Kernel panic-not syncing: VFS: unable to mount root fs on unknown-block(179,2)
CPU: 2 PID: 1 Comm: swapper/0 Not tainted 6.1.21-v8+ #1642
Hardware name: Raspberry Pi Compute Module 4 Rev 1.0 (DT)
Call trace:
               dump_backtrace+0x120/0x130
               show_stack+0x20/0x30
               dump_stack_lvl+0x8c/0xb8
               dump_stack+0x18/0x34
               panic+0x1a4/0x37c
               mount_block_root+0x1fc/0x21c
               mount_root+0x1e8/0x21c
               prepare_namepsace+0x134/0x174
               kernel_init_freeable+0x2a0/0x2cc
               kernel_init+0x2c/0x138
               ret_from_fork+0x10/0x20
SMP: stopping secondary CPUs
Kernel Offset: 0x2b66600000 from 0xffffffc008000000
PHYS_OFFSET: 0x0
CPU features: 0x20000,2013c080,0000421b
Memory Limit: none

It no longer recognizes my keyboard/mouse anymore either. This error message persists whether I have a microSD card in or not. I've tried just about every available related solution: re-imaging the card (with both Etcher and the Raspberry Pi imager), new microSD cards, sudo fsck, editing cmdline.txt. None produced any difference in the error code or functioning at all. I do not have any important files on the card, I just want my pi to start running again.

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    (179,6) is the sixth partition on your SDCard. It needs a fsck -f -y /dev/mmcblk0p6 to get it working again. You can do that with any other Linux system with the broken card in a USB reader. That could be your RPI booted from a second SDCard with RaspiOS Lite booted. (179,2) is the second partion (your question isn't clear).
    – Dougie
    Jul 19 at 18:21
  • to clarify, you have a pi without eMMC?
    – Jaromanda X
    Jul 20 at 3:37
  • @Dougie It is (179, 2), I mistyped.
    – SirLucidus
    Jul 20 at 10:14
  • @JaromandaX it has the 8GB eMMC
    – SirLucidus
    Jul 20 at 10:22
  • I didn't think it was possible to boot from SD on a CM4 with eMMC
    – Jaromanda X
    Jul 20 at 12:07

1 Answer 1

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I was able to fix the issue by reinstalling the os via the USB port.

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