exynos5800 based peach-pi boot is broken with v4.6-rc-1

[Doug Anderson]

Alim,

On Tue, Apr 12, 2016 at 4:57 AM, Alim Akhtar <alim.akhtar at samsung.com> wrote:
> Hi All,
> I can't boot Peach-pi (exynos5800) with v4.6-rc-1, board hangs while booting
> with below boot hang-task.
> I have not git-bisected yet, will do that, but AFAIR it was booting fine
> with v4.5.
> Any idea?
>
> =======
> [    3.682786]  mmcblk1: p1 p2 p3 p4 p5 p6 p7 p8 p9 p10 p11 p12
> [   36.001343] random: nonblocking pool is initialized
> [  240.086291] INFO: task swapper/0:1 blocked for more than 120 seconds.
> [  240.091271]       Not tainted 4.6.0-rc1 #1
> [  240.095324] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
> this message.
> [  240.103153] swapper/0       D c07247cc     0     1      0 0x00000000
> [  240.109480] [<c07247cc>] (__schedule) from [<c0724ca0>]
> (schedule+0x40/0xac)
> [  240.116517] [<c0724ca0>] (schedule) from [<c0724f04>]
> (schedule_preempt_disabled+0x14/0x20)
> [  240.124846] [<c0724f04>] (schedule_preempt_disabled) from [<c0727704>]
> (__mutex_lock_slowpath+0x1b4/0x418)
> [  240.134474] [<c0727704>] (__mutex_lock_slowpath) from [<c0727974>]
> (mutex_lock+0xc/0x24)
> [  240.142544] [<c0727974>] (mutex_lock) from [<c05a1678>]
> (cros_ec_cmd_xfer+0x18/0xe8)
> [  240.150262] [<c05a1678>] (cros_ec_cmd_xfer) from [<c05a087c>]
> (get_lightbar_version+0x34/0xb8)
> [  240.158849] [<c05a087c>] (get_lightbar_version) from [<c05a092c>]
> (cros_ec_lightbar_attrs_are_visible+0x2c/0x38)
> [  240.169000] [<c05a092c>] (cros_ec_lightbar_attrs_are_visible) from
> [<c024ca58>] (internal_create_group+0xb4/0x2d4)
> [  240.179323] [<c024ca58>] (internal_create_group) from [<c024cda4>]
> (sysfs_create_groups+0x48/0xc8)
> [  240.188260] [<c024cda4>] (sysfs_create_groups) from [<c0431c6c>]
> (device_add+0x258/0x528)
> [  240.196413] [<c0431c6c>] (device_add) from [<c059fc90>]
> (ec_device_probe+0x12c/0x14c)
> [  240.204223] [<c059fc90>] (ec_device_probe) from [<c0435c90>]
> (platform_drv_probe+0x50/0xa0)
> [  240.212549] [<c0435c90>] (platform_drv_probe) from [<c04344b0>]
> (driver_probe_device+0x200/0x2ac)
> [  240.221397] [<c04344b0>] (driver_probe_device) from [<c0434600>]
> (__driver_attach+0xa4/0xa8)
> [  240.229811] [<c0434600>] (__driver_attach) from [<c0432b90>]
> (bus_for_each_dev+0x54/0x88)
> [  240.237966] [<c0432b90>] (bus_for_each_dev) from [<c0433b00>]
> (bus_add_driver+0x174/0x1fc)
> [  240.246206] [<c0433b00>] (bus_add_driver) from [<c0434e00>]
> (driver_register+0x78/0xf4)
> [  240.254188] [<c0434e00>] (driver_register) from [<c0b22dcc>]
> (cros_ec_dev_init+0x88/0xd0)
> [  240.262344] [<c0b22dcc>] (cros_ec_dev_init) from [<c0101774>]
> (do_one_initcall+0x90/0x1d4)
> [  240.270587] [<c0101774>] (do_one_initcall) from [<c0b00d98>]
> (kernel_init_freeable+0x14c/0x1f4)
> [  240.279259] [<c0b00d98>] (kernel_init_freeable) from [<c0723cb4>]
> (kernel_init+0x8/0x114)
> [  240.287416] [<c0723cb4>] (kernel_init) from [<c0107e38>]
> (ret_from_fork+0x14/0x3c)
> [  240.294961] INFO: task kworker/3:1:78 blocked for more than 120 seconds.
> [  240.301637]       Not tainted 4.6.0-rc1 #1

I haven't dug, but it wouldn't surprise me if you found the same issue
Heiko did.  Can you see if
<https://patchwork.kernel.org/patch/8617941/> helps you?

-Doug