Le 12/10/2018 à 15:23, Abdul Haleem a écrit :

On Fri, 2018-10-12 at 12:36 +0200, Christophe LEROY wrote:

quoted

Le 12/10/2018 à 12:31, Abdul Haleem a écrit :

quoted

On Fri, 2018-10-12 at 10:08 +0200, Christophe LEROY wrote:

quoted

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

quoted

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

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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 ?

CONFIG_HAVE_STACKPROTECTOR=y
CONFIG_CC_HAS_STACKPROTECTOR_NONE=y
CONFIG_STACKPROTECTOR=y
CONFIG_STACKPROTECTOR_STRONG=y

ah yes, I have attached the correct config now.

Ok,

Could you please try and add a call to function boot_init_stack_canary()
in function start_secondary() in arch/powerpc/kernel/smp.c just before
the call to cpu_startup_entry() ?

Yes, it works. kernel boots fine with above changes to arch/powerpc/kernel/smp.c

Thanks,

Could you please test the patch I just sent ?
I that patch, I initialises the stack canary when preparing the idle 
tasks rather than doing it at its startup.

Christophe