Hi Sergey, Gregory,
Sergey Matyukevich writes:
> MacchiatoBin board fails to boot v4.20-rc1 kernel built using arm64
> defconfig. According to quick bisection of the board dts file, the
> root cause is in dts patch enabling CPU deep idle states:
> see 8ed46368776b3bc. Is there any pending fix other than reverting
> deep idle state support ?
I reproduced the same boot failure on the Armada 8K based Clearfog
GT-8K. Revert of commit 8ed46368776b3bc on top of v4.20-rc1 makes the
system boot again.
Here is the splat I get:
[ 87.358425] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 87.364556] rcu: 3-...!: (1 ticks this GP) idle=d04/0/0x0 softirq=79/79 fqs=1
[ 87.371897] rcu: (detected by 2, t=21490 jiffies, g=-1035, q=179)
[ 87.378106] Task dump for CPU 3:
[ 87.381347] swapper/3 R running task 0 0 1 0x00000028
[ 87.388428] Call trace:
[ 87.390892] __switch_to+0x78/0xb4
[ 87.394310] arm_enter_idle_state+0x38/0x4c
[ 87.398512] cpuidle_enter_state+0xc8/0x15c
[ 87.402713] cpuidle_enter+0x18/0x20
[ 87.406304] call_cpuidle+0x30/0x34
[ 87.409807] do_idle+0x19c/0x224
[ 87.413048] cpu_startup_entry+0x20/0x24
[ 87.416988] secondary_start_kernel+0x158/0x168
baruch
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