On 10/12/18 1:38 PM, Christophe LEROY wrote:

Le 12/10/2018 à 09:48, Abdul Haleem a écrit :

quoted

On Fri, 2018-10-12 at 13:15 +0530, Abdul Haleem wrote:

quoted

Greeting's

Today's linux-next fails to boot on powerpc bare-metal with this error

POWER8 performance monitor hardware support registered
rcu: Hierarchical SRCU implementation.
smp: Bringing up secondary CPUs ...
Kernel panic - not syncing: stack-protector: Kernel stack is 
corrupted in: __schedule+0x978/0xa80
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 
4.19.0-rc7-next-20181010-autotest-autotest #1
Call Trace:
[c000001fed5b3bf0] [c000000000a0ef3c] dump_stack+0xb0/0xf4 (unreliable)
[c000001fed5b3c30] [c0000000000f9d68] panic+0x140/0x308
[c000001fed5b3cc0] [c0000000000f9844] __stack_chk_fail+0x24/0x30
[c000001fed5b3d20] [c000000000a2c3a8] __schedule+0x978/0xa80
[c000001fed5b3e00] [c000000000a2c9b4] schedule_idle+0x34/0x60
[c000001fed5b3e30] [c00000000013d344] do_idle+0x224/0x3d0
[c000001fed5b3ec0] [c00000000013d6e0] cpu_startup_entry+0x30/0x50
[c000001fed5b3ef0] [c000000000047f34] start_secondary+0x4d4/0x520
[c000001fed5b3f90] [c00000000000b370] start_secondary_prolog+0x10/0x14
Rebooting in 10 seconds..

Machine: Power 8 bare-metal
kernel version: 4.19.0-rc7-next-20181010
gcc version: 4.8.5 20150623
config attach

Attaching the kernel config file

# Linux/powerpc 4.11.0-rc4 Kernel Configuration

This is not the correct config file. Can you send the .config ?

Christophe

modified   kernel/sched/idle.c

@@ -352,7 +352,6 @@ void cpu_startup_entry(enum cpuhp_state state)
  	 * make this generic (ARM and SH have never invoked the canary
  	 * init for the non boot CPUs!). Will be fixed in 3.11
  	 */
-#ifdef CONFIG_X86
  	/*
  	 * If we're the non-boot CPU, nothing set the stack canary up
  	 * for us. The boot CPU already has it initialized but no harm

@@ -361,7 +360,6 @@ void cpu_startup_entry(enum cpuhp_state state)
  	 * canaries already on the stack wont ever trigger).
  	 */
  	boot_init_stack_canary();
-#endif
  	arch_cpu_idle_prepare();
  	cpuhp_online_idle(state);
  	while (1)

This fixes it for me. But we may have to look at the other arch details 
mentioned there.

-aneesh