On 2016.12.26 at 12:06 +0100, Markus Trippelsdorf wrote: > On 2016.12.26 at 08:45 +0100, Markus Trippelsdorf wrote: > > On 2016.12.25 at 14:39 +0100, Thomas Gleixner wrote: > > > Linus, > > > > > > please pull the latest smp-urgent-for-linus git tree from: > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git > > > smp-urgent-for-linus > > > > > > Thomas Gleixner (11): > > > cpu/hotplug: Prevent overwriting of callbacks > > > > The following commit: > > > > commit dc280d93623927570da279e99393879dbbab39e7 > > Author: Thomas Gleixner <t...@linutronix.de> > > Date: Wed Dec 21 20:19:49 2016 +0100 > > > > cpu/hotplug: Prevent overwriting of callbacks > > > > results in an early OOPs during boot on my AMD machine. > > I haven't wrote down the entire backtrace, but basically things start to > > go wrong in mce_threshold_create_device() from > > arch/x86/kernel/cpu/mcheck/mce_amd.c. > > > > # CONFIG_HOTPLUG_CPU is not set > > > > Reverting the commit "fixes" the issue for me. > > CCing Sebastian and Borislav.
BUG: unable to handle kernel NULL pointer dereference at 000000000000004c RIP: kobject_get at lib/kobject.c:594 (inlined by) kobject_add_internal at lib/kobject.c:214 ? kobj_to_dev at include/linux/device.h:968 (discriminator 1) (inlined by) get_device at drivers/base/core.c:1796 (discriminator 1) ? kobject_add at lib/kobject.c:415 ? kobject_create_and_add at lib/kobject.c:753 ? threshold_create_bank at arch/x86/kernel/cpu/mcheck/mce_amd.c:1212 (inlined by) mce_threshold_create_device at arch/x86/kernel/cpu/mcheck/mce_amd.c:1348 The comment in arch/x86/kernel/cpu/mcheck/mce_amd.c says: 1384 * mcheck_init_device should be inited before threshold_init_device to 1385 * initialize mce_device, otherwise a NULL ptr dereference will cause panic. -- Markus
