Changeset 1405c4a for chapter08/kernel.xml

Timestamp:

05/21/2020 07:40:38 AM (3 years ago)

Author:

Pierre Labastie <pieere@…>

Branches:

10.0, 10.0-rc1, 10.1, 10.1-rc1, 11.0, 11.0-rc1, 11.0-rc2, 11.0-rc3, 11.1, 11.1-rc1, 11.2, 11.2-rc1, 11.3, 11.3-rc1, arm, bdubbs/gcc13, ml-11.0, multilib, old-trunk, s6-init, trunk, xry111/arm64, xry111/clfs-ng, xry111/git-transition, xry111/glibc-2.34, xry111/glibc-2.37, xry111/kcfg-revise, xry111/lfs-next, xry111/pip3, xry111/queue-11.3, xry111/rust-wip-20221008, xry111/tester-nohack, xry111/usr-move

Children:

d2c3c576

Parents:

aabe1fa

Message:

Fix kernel crash when using STACK_PROTECTOR_STRONG=y

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@11852 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

File:

• chapter08/kernel.xml (modified) (1 diff)

chapter08/kernel.xml

@@ -54 +54 @@
     kernel compilation. Do not rely on the source tree being clean after
     un-tarring.</para>
+
+    <!-- The following paragraph and sed should be only necessary on the 5.6
+         series, but check when 5.7 is out. -->
+    <para>When using <envar>CONFIG_STACKPROTECTOR_STRONG=y</envar>, and
+    compiling with GCC 10 and later, the default optimization is too
+    aggressive, and generates a kernel panic when booting. This can be
+    fixed with:</para>
+
+<screen><userinput remap="pre">sed -e '/cpu_startup/a asm("");' \
+    -i arch/x86/{kernel/smpboot.c,xen/smp_pv.c}</userinput></screen>
 
     <!-- Support for compiling a keymap into the kernel is deliberately removed -->