Commit 14994a9b authored by Zhouyi Zhou's avatar Zhouyi Zhou Committed by Jonathan Corbet

docs: disable KASLR when debugging kernel

commit 6807c846 ("x86: Enable KASLR by default") enables KASLR
by default on x86. While KASLR will confuse gdb which resolve kernel
symbol address from symbol table of vmlinux. We should turn off KASLR for
kernel debugging.
Signed-off-by: default avatarZhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 4c047789
......@@ -348,6 +348,15 @@ default behavior is always set to 0.
- ``echo 1 > /sys/module/debug_core/parameters/kgdbreboot``
- Enter the debugger on reboot notify.
Kernel parameter: ``nokaslr``
-----------------------------
If the architecture that you are using enable KASLR by default,
you should consider turning it off. KASLR randomizes the
virtual address where the kernel image is mapped and confuse
gdb which resolve kernel symbol address from symbol table
of vmlinux.
Using kdb
=========
......@@ -358,7 +367,7 @@ This is a quick example of how to use kdb.
1. Configure kgdboc at boot using kernel parameters::
console=ttyS0,115200 kgdboc=ttyS0,115200
console=ttyS0,115200 kgdboc=ttyS0,115200 nokaslr
OR
......
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