possible bugs on odroid, or maybe that is not meson related?

[Anand Moon]

Hi Michal

On 30 December 2016 at 00:05, Michał Zegan <webczat_200 at poczta.onet.pl> wrote:
> Hello.
>
> On the odroid c2/meson gxbb/kernel from torwalds master, sometimes I
> have random problems.
> Those problems are task stalls. Once it happened when loading the usb
> module, once it happened after running the find command.
> A minute ago I have actually tried to switch_root manually from initrd
> to real root, and there was a stall and something else.
> Here it is:
>
> swapper/2[0]: undefined instruction: pc=ffffff800853f4d4
> Code: aa1a03f5 14000004 d503201f f94002b5 (b4001555)
> Internal error: undefined instruction: 0 [#1] SMP
> Modules linked in: squashfs loop mmc_block meson_gx_mmc pwrseq_emmc
> mmc_core dwc2 udc_
> core usbcore phy_meson8b_usb2 rtc_pcf8563 i2c_meson i2c_core
> scpi_cpufreq arm_big_litt
> le scpi_hwmon thermal_sys hwmon clk_scpi arm_scpi platform_mhu
> gpio_regulator fixed nl
> s_iso8859_1 nls_cp437 vfat fat btrfs raid6_pq xor crc32c_generic
> crc32_generic
> CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.10.0-rc1 #7
> Hardware name: Hardkernel ODROID-C2 (DT)
> task: ffffffc074bace00 task.stack: ffffffc074bb8000
> PC is at __schedule+0x2d4/0x590
> LR is at __schedule+0x2e8/0x590
> pc : [<ffffff800853f4d4>] lr : [<ffffff800853f4e8>] pstate: 800001c5
> sp : ffffffc074bbbef0
> x29: ffffffc074bbbef0 x28: 0000000000000000
> x27: 0000000000000000 x26: ffffff8008565428
> x25: ffffffc074bad320 x24: ffffff800853f7b4
> x23: ffffff8008897000 x22: ffffffc074bace00
> x21: ffffff8008565368 x20: 0000000000000000
> x19: ffffffc076fbba00 x18: 0000000000000000
> x17: 00000000000045a5 x16: 0000000000000000
> x15: 0000000000000000 x14: 0000000000000000
> x13: 0000000000000000 x12: 0000000000000000
> x11: ffffff8008565298 x10: ffffffc076fbba38
> x9 : ffffffc074bbbed0 x8 : 0000000000000002
> x7 : 7fffffffffffffff x6 : 0000000489f55a18
> x5 : 0000000000000020 x4 : 0000000000000000
> x3 : 0000000000000000 x2 : ffffff80080f73d8
> x1 : ffffffc074bace00 x0 : 0000000000000000
> Process swapper/2 (pid: 0, stack limit = 0xffffffc074bb8000)
> Stack: (0xffffffc074bbbef0 to 0xffffffc074bbc000)
> bee0:                                   ffffffc074bbbf50 ffffff800853f7b4
> bf00: ffffff8008897000 ffffff8008ac9cf8 ffffff8008ac9000 ffffff800889fa48
> bf20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> bf40: ffffff8008897000 ffffff8008ac9cf8 ffffffc074bbbf60 ffffff800853fadc
> bf60: ffffffc074bbbf70 ffffff80080f8428 ffffffc074bbbfb0 ffffff80080f8738
> bf80: 0000000000000075 0000000000000002 0000000000000000 0000000000000000
> bfa0: 0000000000000000 0000000000000000 ffffffc074bbbfd0 ffffff800808d694
> bfc0: 0000000000000002 0000000000000000 0000000000000000 000000000154b1a4
> bfe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> Call trace:
> Exception stack(0xffffffc074bbbda0 to 0xffffffc074bbbed0)
> bda0: ffffffc076fbba00 0000008000000000 ffffffc074bbbef0 ffffff800853f4d4
> bdc0: 0000000000000000 ffffffc074bace00 ffffff80080f73d8 0000000000000000
> bde0: 0000000000000000 0000000000000020 0000000489f55a18 7fffffffffffffff
> be00: 0000000000000002 ffffffc074bbbed0 ffffffc076fbba38 ffffff8008565298
> be20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> be40: 0000000000000000 00000000000045a5 0000000000000000 ffffffc076fbba00
> be60: 0000000000000000 ffffff8008565368 ffffffc074bace00 ffffff8008897000
> be80: ffffff800853f7b4 ffffffc074bad320 ffffff8008565428 0000000000000000
> bea0: 0000000000000000 ffffffc074bbbef0 ffffff800853f4e8 ffffffc074bbbef0
> bec0: ffffff800853f4d4 00000000800001c5
> [<ffffff800853f4d4>] __schedule+0x2d4/0x590
> [<ffffff800853f7b4>] schedule+0x24/0x80
> [<ffffff800853fadc>] schedule_preempt_disabled+0xc/0x18
> [<ffffff80080f8428>] do_idle+0xa8/0x1e8
> [<ffffff80080f8738>] cpu_startup_entry+0x20/0x28
> [<ffffff800808d694>] secondary_start_kernel+0x154/0x1b0
> [<000000000154b1a4>] 0x154b1a4
> Code: aa1a03f5 14000004 d503201f f94002b5 (b4001555)
> INFO: rcu_sched detected stalls on CPUs/tasks:
>         2-...: (1 GPs behind) idle=5a5/140000000000001/0 softirq=595/596
> fqs=2100
>         (detected by 1, t=6303 jiffies, g=356, c=355, q=1)
> Task dump for CPU 2:
> swapper/2       R  running task        0     0      1 0x00000002
> Call trace:
> [<ffffff80080854a4>] __switch_to+0x8c/0xb0
> [<ffffff800853f4e8>] __schedule+0x2e8/0x590
> [<ffffff800853f7b4>] schedule+0x24/0x80
> [<ffffff800853fadc>] schedule_preempt_disabled+0xc/0x18
> [<ffffff80080f8428>] do_idle+0xa8/0x1e8
> [<ffffff80080f8738>] cpu_startup_entry+0x20/0x28
> [<ffffff800808d694>] secondary_start_kernel+0x154/0x1b0
> [<000000000154b1a4>] 0x154b1a4
> INFO: rcu_sched detected stalls on CPUs/tasks:
>         2-...: (1 GPs behind) idle=5a5/140000000000001/0 softirq=595/596
> fqs=8398
>         (detected by 1, t=25208 jiffies, g=356, c=355, q=1)
> Task dump for CPU 2:
> swapper/2       R  running task        0     0      1 0x00000002
> Call trace:
> [<ffffff80080854a4>] __switch_to+0x8c/0xb0
> [<ffffff800853f4e8>] __schedule+0x2e8/0x590
> [<ffffff800853f7b4>] schedule+0x24/0x80
> [<ffffff800853fadc>] schedule_preempt_disabled+0xc/0x18
> [<ffffff80080f8428>] do_idle+0xa8/0x1e8
> [<ffffff80080f8738>] cpu_startup_entry+0x20/0x28
> [<ffffff800808d694>] secondary_start_kernel+0x154/0x1b0
> [<000000000154b1a4>] 0x154b1a4
> INFO: rcu_sched detected stalls on CPUs/tasks:
>         2-...: (1 GPs behind) idle=5a5/140000000000001/0 softirq=595/596
> fqs=14696
>         (detected by 1, t=44113 jiffies, g=356, c=355, q=1)
> Task dump for CPU 2:
> swapper/2       R  running task        0     0      1 0x00000002
> Call trace:
> [<ffffff80080854a4>] __switch_to+0x8c/0xb0
> [<ffffff800853f4e8>] __schedule+0x2e8/0x590
> [<ffffff800853f7b4>] schedule+0x24/0x80
> [<ffffff800853fadc>] schedule_preempt_disabled+0xc/0x18
> [<ffffff80080f8428>] do_idle+0xa8/0x1e8
> [<ffffff80080f8738>] cpu_startup_entry+0x20/0x28
> [<ffffff800808d694>] secondary_start_kernel+0x154/0x1b0
> [<000000000154b1a4>] 0x154b1a4
> INFO: rcu_sched detected stalls on CPUs/tasks:
>         2-...: (1 GPs behind) idle=5a5/140000000000001/0 softirq=595/596
> fqs=20994
>         2-...: (1 GPs behind) idle=5a5/140000000000001/0 softirq=595/596
> fqs=20994
>         (detected by 1, t=63018 jiffies, g=356, c=355, q=3)
> Task dump for CPU 2:
> swapper/2       R  running task        0     0      1 0x00000002
> Call trace:
> [<ffffff80080854a4>] __switch_to+0x8c/0xb0
> [<ffffff800853f4e8>] __schedule+0x2e8/0x590
> [<ffffff800853f7b4>] schedule+0x24/0x80
> [<ffffff800853fadc>] schedule_preempt_disabled+0xc/0x18
> [<ffffff80080f8428>] do_idle+0xa8/0x1e8
> [<ffffff80080f8738>] cpu_startup_entry+0x20/0x28
> [<ffffff800808d694>] secondary_start_kernel+0x154/0x1b0
> [<000000000154b1a4>] 0x154b1a4
> INFO: rcu_sched detected stalls on CPUs/tasks:
>
> .....
> I do not know if it is related to normal stalls I get, I get them rarely
> and the one before this had no stacktrace, and there was no such error
> as "undefined instruction" in kernel space. But it sometimes randomly
> happens.
> Not sure if that is odroid problem or something in the core kernel
> code/regression not related to the meson code.
>

I am not able to boot the latest kernel on Odroid C2
could some body share the u-boot command to boot the kernel.
I am using the u-boot provided by HK.

It would nice to work on latest version.

-Best Regards
Anand