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Booting and Shutting Down Oracle® Solaris 11.4 Systems

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Updated: August 2018
 
 

x86: How to Force a Crash Dump and Reboot of the System

If you cannot use the reboot –d or the halt –d command, you can use the kernel debugger (kmdb) to force a crash dump. The kernel debugger must have been loaded, either at boot time or with the mdb –k command for the following procedure to work.


Note -  You must be in text mode to access the kernel debugger. So, first exit any window system.

Before You Begin

Ensure that your role has the appropriate rights profiles to perform this procedure. See Using Rights Profiles to Administer Boot Features.

  1. Access the kernel debugger.

      The method that is used to access the debugger is dependent upon the type of console that you are using to access the system.

    • If you are using a locally attached keyboard, press F1–A.

    • If you are using a serial console, send a break by using the method appropriate to that type of serial console.

    The kmdb prompt is displayed.

  2. To force a crash, use the systemdump macro.
    [0]> $<systemdump

    Panic messages are displayed, the crash dump is saved, and the system reboots.

  3. Verify that the system has rebooted by logging in at the console login prompt.
Example 29  x86: Forcing a Crash Dump and Reboot of the System by Using the halt –d Command

This example shows how to force a crash dump and reboot of an x86 based system by using the halt –d command.

$ halt -d
4ay 30 15:35:15 wacked.<domain>.COM halt: halted by user

panic[cpu0]/thread=ffffffff83246ec0: forced crash dump initiated at user request

fffffe80006bbd60 genunix:kadmin+4c1 ()
fffffe80006bbec0 genunix:uadmin+93 ()
fffffe80006bbf10 unix:sys_syscall32+101 ()

syncing file systems... done
dumping to /dev/dsk/c1t0d0s1, offset 107675648, content: kernel
NOTICE: adpu320: bus reset
100% done: 38438 pages dumped, compression ratio 4.29, dump succeeded

Welcome to kmdb
Loaded modules: [ audiosup crypto ufs unix krtld s1394 sppp nca uhci lofs 
genunix ip usba specfs nfs md random sctp ]
[0]> 
kmdb: Do you really want to reboot? (y/n) y