Re: next-20170125 hangs on aarch64

From: Yury Norov
Date: Sun Jan 29 2017 - 07:37:29 EST

On Sun, Jan 29, 2017 at 03:42:55PM +0530, Yury Norov wrote:
> Hi all,
> I pulled next-20170125 kernel, and found it hanged on boot. The exact reason is
> panic on dereferencing of the 0xffffffc8 address, which is most probably the
> attempt to dereference the ENOSYS error code as the address. next-20170124 works
> fine, at least it boots.
> Does anyone have details on that?
> Yury


I run qemu for testing.

The true failure backtrace is like below. The bad dereference happens for me in
arm_smccc_hvc() function in macro SMCCC.



#0 0xffff00000808f7a8 in arm_smccc_hvc () at
#1 0xffff000008745ea0 in __invoke_psci_fn_hvc (function_id=<optimized out>, arg0=<optimized out>,
arg1=<optimized out>, arg2=<optimized out>) at drivers/firmware/psci.c:119
#2 0xffff000008745d18 in psci_migrate_info_type () at drivers/firmware/psci.c:204
#3 0xffff000008ca150c in psci_init_migrate () at drivers/firmware/psci.c:465
#4 psci_probe () at drivers/firmware/psci.c:539
#5 0xffff000008ca1684 in psci_0_2_init (np=<optimized out>) at drivers/firmware/psci.c:571
#6 0xffff000008ca16d8 in psci_dt_init () at drivers/firmware/psci.c:637
#7 0xffff000008c62914 in setup_arch (cmdline_p=<optimized out>) at arch/arm64/kernel/setup.c:287
#8 0xffff000008c6082c in start_kernel () at init/main.c:509
#9 0xffff000008c601e0 in __primary_switched () at arch/arm64/kernel/head.S:452


â0xffff00000808f790 <arm_smccc_hvc> hvc #0x0
â0xffff00000808f794 <arm_smccc_hvc+4> ldr x4, [sp]
â0xffff00000808f798 <arm_smccc_hvc+8> stp x0, x1, [x4]
â0xffff00000808f79c <arm_smccc_hvc+12> stp x2, x3, [x4,#16]
â0xffff00000808f7a0 <arm_smccc_hvc+16> ldr x4, [sp,#8]
â0xffff00000808f7a4 <arm_smccc_hvc+20> cbz x4, 0xffff00000808f7b8 <arm_smccc_hvc+40>
>â0xffff00000808f7a8 <arm_smccc_hvc+24 ldr x9, [x4]
â0xffff00000808f7ac <arm_smccc_hvc+28> cmp x9, #0x1
â0xffff00000808f7b0 <arm_smccc_hvc+32> 0xffff00000808f7b8 <arm_smccc_hvc+40>
â0xffff00000808f7b4 <arm_smccc_hvc+36> str x6, [x4,#8]
â0xffff00000808f7b8 <arm_smccc_hvc+40> ret