What causes a kernel oops?

In Windows, kernel panic is typically characterized by the appearance of a BSOD error message stating that the system needs a restart. The error is usually caused by malfunctioning hardware or poorly optimized device drivers.

How do I debug kernel in oops?

cd to your directory of your kernel tree and run gdb on the “.o” file which has the function sd_remove() in this case in sd.o, and use the gdb “list” command, (gdb) list *(function+0xoffset), in this case function is sd_remove() and offset is 0x20, and gdb should tell you the line number where you hit the panic or oops …

What is kernel Panic_on_oops?

This parameter controls the kernel’s behaviour when an oops or bug is encountered: 0: try to continue operation. 1: panic immediately. If the `panic’ sysctl is also non-zero then the machine will be rebooted.

What are kernel errors?

The kernel data inpage error is a Windows error code displayed on the Blue Screen of Death (BSOD). Your computer will typically compile some diagnostic data and then restart when this error occurs. If the problem persists, your computer will eventually crash again with the same kernel data inpage error message.

What is kernel lockup?

A ‘hard lockup’ is defined as a bug that causes the CPU to loop in kernel mode for more than 10 seconds […], without letting other interrupts have a chance to run. In other words, during a soft lockup a kernel task won’t unlock the CPU, like in the good old DOS days. So “something or other” is left “hanging”.

What is Kptr_restrict?

Official reference. This toggle indicates whether restrictions are placed on exposing kernel addresses via /proc and other interfaces. When kptr_restrict is set to 0 (the default) the address is hashed before printing. (This is the equivalent to %p.)

What is Watchdog_thresh?

watchdog_thresh. This value is used to set the frequency of hrtimer and NMI events and the soft and hard lockup thresholds. The default threshold is 10 seconds.

What causes soft lockup?

This ‘soft lockup’ can happen if the kernel is busy, working on a huge amount of objects which need to be scanned, freed, or allocated, respectively. The stack traces of those tasks can give a first idea about what the tasks were doing.

What is hard lockup on CPU?

A ‘hard lockup’ is defined as a bug that causes the CPU to loop in kernel mode for more than 10 seconds […], without letting other interrupts have a chance to run. In other words, during a soft lockup a kernel task won’t unlock the CPU, like in the good old DOS days.

What is the use of kernel log?

On boot-time your system logs information about the kernel ring buffer. This shows us information about hardware drivers, kernel information and status during bootup and more.

How does crash dump work?

A Kernel Crash Dump refers to a portion of the contents of volatile memory (RAM) that is copied to disk whenever the execution of the kernel is disrupted. The following events can cause a kernel disruption : Kernel Panic. Non Maskable Interrupts (NMI)

Can I delete var crash?

You can delete files in under /var/crash if you’re willing to lose useful information needed to debug those crashes.