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Tips For Fixing Debugging When Kernel Crashes

You may encounter an error indicating that the kernel is locked. There are several ways to solve this problem, which we will talk about shortly.

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    Question

    The system can be tested to prevent active sessions from continuing to connect when new ones are opened.

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      alt-sysrq-c

      Note: System P (ppc64), old sysrq can test the crash dump as expected. In this case of real panic, the debugger part (my>) is called, and everyone has to type “X” to start the dump.

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    In this case, you may have enabled Sysrq but haven’t finished configuring the crash dump yet, it can still be very useful to use the Sysrq engine to collect data. Use the following sequences entirely in the console:

      Alt-Sysrq-p (process list)
      Alt-Sysrq-t (battery)
      Alt-Sysrq-m (memory)

    The kernel.unknown_nmi_panic advantage allows you to take along and nmi oops if your devices have an NMI button. This is preferred when the system cannot be polled or otherwise accessible. This is helpl in troubleshooting common hardware problems. You usually only activate it after every call to support.

    Before inspiring kernel.unknown_nmi_panic, make sure nmi_watchdog is capable of this by running:

    If there are probably non-zero values, you need to disable nmi_watchdog in the bootloader. Modify the Sell Core for line to include:

    Don’t forget to reboot quickly after changing the bootloader and make sure it’s disabled:

      kernel.unknown_nmi_panic = 1

    kernel hang debug

    You can confirm sysctl with the following command: sysctl -A | less

    NOTE: unknown_nmi_panic is not compatible with nmi_watchdog and Oracle hangcheck_timer. Please contact customer service for more information.

    These types of problems are often difficult to solve without direct intervention from the software. In our experience, a hard case lock can be a hardware issue. Make sure all firmware, BIOS and diagnostics have been checked and / or updated.

    You must first walk around to confirm what the car is saying. Some suggestions:

    How to do local kernel debugging In WinDbg?

    Using WinDbg. Open WinDbg as administrator. From the File menu, select Debug Kernel. In the Harmless Debug Kernel dialog box, click the Locals tab.

    – Get customizedSee your kdump configuration and test it before using it.

    Sysrq allows you to use a backdoor in my kernel to collect information or create a crash dump if the kernel still exists, ie. it is available for ping.

    kernel.sysrq = 1
    kernel.panic_on_oops matches 1 (best practice)

    – You can specify sysctl values ​​with the following command: sysctl -A | less

    – Then you can judge it by typing echo into / proc / sysrq-trigger. that is

    replicate> m / proc / sysrq-trigger

    kernel hang debug

    – If the system freezes, go to the console and use the deprecated sysrq sequences below. The Sysrq key is almost always labeled PrintScreen.

    Usually built-in cards have a serious watchdog. You need to enable this great timer and use a custom watchdog project to run watchdog heavy products. Use nice for the watchdog process so that higher priority tasks are transferred to the CPU. This indicates a problem. If the equipment does not restart when the dog is powered up, It is possible that only the network or serial port has stopped communicating. That is, the kernel has not been configured. The problem is that usually the user doesn’t see the activity. Dog observation is also helpful if you have similar problems in this area.

    In the case of a kernel, it can be useful to lock the kernel functions of my lock watchdogs. This works when you have an infinite loop / block as intended. However, if this key fact is hardware, it is also possible, depending on the specific client, for the SDRAM or peripheral applicator to fail and cause abnormal bus activity. This prevents the processor from receiving the correct code; obviously Linux is hard to recover from this.

    You may be partially combining a watchdog timer with a callback that is used as a trace stream. memmap = mem = and can limit the compression used by the kernel. This memory can be used to record important drivers / devices that store tracepoints that survive on the system. Buffer emptyThis ring memory is cleared if the watchdog timer is reset during kernel startup.

    It is also useful to register thread notifiers, which can perform excellent context switches to printk if the problem recurs, or to learn how to make an event repeatable. After your entire family has identified a series of events for potential clients to solve, you can use this oscilloscope or logic analyzer to perform their chosen final diagnosis. Or it can be seen in which device the problem is currently excellent.

    You can also set panic = -1 to reboot = ... on the kernel command line. However, kdump’s capabilities are useful if you have problems with your code.

    Related: Kernel capture method (in web archive). This link may be available for a long time, but is not important for the answer.

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