Fix Kernel Panic

Understanding Kernel Panic

The Linux kernel encountered a fatal error and cannot continue.

If Panic Occurs at Boot

1. Boot from Recovery/Rescue Mode

Use Hostxpeed console → Boot from rescue ISO or previous kernel.

2. Select Previous Kernel in GRUB

During boot, press Esc/Shift to access GRUB → Advanced options → Select older kernel.

3. Fix Root Filesystem

# In rescue mode
fsck -y /dev/sda1

If Panic Occurs During Operation

1. Check dmesg for Hardware Errors

# After reboot
dmesg | grep -i "error|fail|panic"
journalctl -k | grep -i panic

2. Remove Recent Kernel Update

# Boot with old kernel
# Then remove problematic kernel
sudo apt remove linux-image-5.X.X-generic
sudo update-grub

3. Check for Hardware Issues (Dedicated)

# Memory test
sudo memtest86+

# CPU stress test
sudo stress --cpu 4 --timeout 60

4. Check for Module Conflicts

# Blacklist problematic module
echo "blacklist problem_module" >> /etc/modprobe.d/blacklist.conf
update-initramfs -u

For VPS - Contact Hostxpeed

Kernel panic on VPS may indicate:

• Host node issues
• Corrupted kernel
• Resource constraints

Open support ticket with:

# Output from crash
journalctl -b -1 | grep -i panic
dmesg | grep -i panic

Emergency Kernel Parameters

At GRUB, add to boot line:

# Disable ACPI (power management issue)
acpi=off

# Disable IOMMU
iommu=off

# Single user mode
single

# Run init=/bin/bash directly
init=/bin/bash