252 lines
3.6 KiB
HTML
252 lines
3.6 KiB
HTML
<HTML
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><HEAD
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>Setup, Test, and Running crash</TITLE
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>Linux Crash HOWTO</TH
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><H1
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CLASS="SECT1"
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><A
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NAME="SETUP"
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>4. Setup, Test, and Running crash</A
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></H1
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN87"
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>4.1. Setting up crash dump</A
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></H2
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><P
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> In order to save a core image that has been written into swap,
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the image must be saved prior to swap being re-mounted during
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boot. To accomplish this, the <TT
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CLASS="FILENAME"
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>sysinit</TT
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>
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startup file needs to be changed. The lkcd source includes a
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<TT
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CLASS="FILENAME"
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>scripts</TT
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> directory which contains patches
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for various sysinit startup scripts. These patches add the
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<B
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CLASS="COMMAND"
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>lkcd config</B
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> and <B
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CLASS="COMMAND"
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>lkcd save</B
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>
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commands to enable crash dumps and to save any existing crash
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dumps upon startup. </P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN94"
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>4.2. Testing crash</A
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></H2
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><P
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> To force a panic to test you new crash setup, compile the following
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code with <B
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CLASS="COMMAND"
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>cc -c -I/usr/src/linux/include panic.c</B
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> .
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After building the <TT
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CLASS="FILENAME"
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>panic.o</TT
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> module just
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<B
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CLASS="COMMAND"
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>insmod panic.o</B
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> to panic the kernel. </P
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><TABLE
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BORDER="1"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="SCREEN"
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> ### panic.c ###########################
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#define __KERNEL__
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# MODULE
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# include init_module(void)
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int init_module (void)
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{
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panic(" panic has been called");
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return 0;
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}
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN101"
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>4.3. Running crash</A
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></H2
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><P
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> To view your kernel core file <B
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CLASS="COMMAND"
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>lcrash</B
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> needs
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to be invoked with a couple of parameters: </P
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><TABLE
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BORDER="1"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="SCREEN"
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> <B
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CLASS="COMMAND"
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>lcrash [ System.map file ] [ dump image ] [ Kerntypes ]</B
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>
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Example:
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<B
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CLASS="COMMAND"
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>lcrash /boot/System.map ./dump.1 /boot/Kerntypes</B
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>It will take a minute to load the kernel image into memory and drop
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you into the crash shell. At the crash shell prompt you can type a
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<TT
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CLASS="USERINPUT"
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><B
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>?</B
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></TT
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> to see the available commands. </P
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></DIV
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></DIV
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><HR
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WIDTH="33%"
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><A
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HREF="install.html"
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>Prev</A
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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>Home</A
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></TD
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><TD
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WIDTH="33%"
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> </TD
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><TD
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>Installation of lkcd</TD
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WIDTH="34%"
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> </TD
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