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SubjectRe: [PATCH v2 4/4] ARM: exynos: Fix imprecise abort during Exynos5422 suspend to RAM
Hi Krzysztof,

On 24 July 2018 at 22:19, Krzysztof Kozlowski <krzk@kernel.org> wrote:
> Suspend to RAM on Odroid XU3/XU4/HC1 family (Exynos5422) causes
> imprecise abort:
>
> PM: Syncing filesystems ... done.
> Freezing user space processes ... (elapsed 0.003 seconds) done.
> OOM killer disabled.
> Freezing remaining freezable tasks ... (elapsed 0.003 seconds) done.
> wake enabled for irq 139
> Disabling non-boot CPUs ...
> IRQ51 no longer affine to CPU1
> IRQ52 no longer affine to CPU2
> IRQ53 no longer affine to CPU3
> IRQ54 no longer affine to CPU4
> IRQ55 no longer affine to CPU5
> IRQ56 no longer affine to CPU6
> cpu cpu4: Dropping the link to regulator.40
> IRQ57 no longer affine to CPU7
> Unhandled fault: external abort on non-linefetch (0x1008) at 0xf081a028
> Internal error: : 1008 [#1] PREEMPT SMP ARM
>
> with last call trace in exynos_suspend_enter().
>
> The abort is caused by writing to register in secure part of sysram.
> Boards booted under secure firmware (e.g. Hardkernel Odroid boards)
> should access non-secure sysram.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
>

I could not get the suspend to ram working on my Odroid-XU4.

Current default time zone: 'Asia/Kolkata'
Local time is now: Thu Jul 26 11:34:50 IST 2018.
Universal Time is now: Thu Jul 26 06:04:50 UTC 2018.

root@odroidxu4:~#
root@odroidxu4:~#
root@odroidxu4:~# rtcwake -d /dev/rtc0 -s 30 -m mem
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Thu Jul 26 06:06:40 2018

System freezes with no output in console. Any other way to test this feature.
I have also tried below setting.

/* Set the wakeup alarm for 30s */
# echo +30 > /sys/class/rtc/rtc0/wakealarm
/* Suspend system to RAM */
# echo -n mem > /sys/power/state

but result is the same.

Well suspend to ram works well on Odroid-U3+
----------------------------------------------------------------------
root@odroidu3:~# rtcwake -d /dev/rtc0 -s 30 -m mem
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Thu Jul 26 05:52:09 2018
[ 58.655171] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
[ 58.655186] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
root@odroidu3:~#
root@odroidu3:~#
root@odroidu3:~#
root@odroidu3:~#
root@odroidu3:~# rtcwake -d /dev/rtc0 -s 30 -m mem
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Thu Jul 26 05:55:36 2018
[ 235.633796] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
[ 235.633811] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
root@odroidu3:~#
root@odroidu3:~#

But also observer following kernel crash on Odroid-U3+.

root@odroidu3:~# rtcwake -d /dev/rtc0 -s 30 -m mem
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Thu Jul 26 06:17:20 2018
[ 48.794091] smsc95xx 1-2:1.0 eth0: entering SUSPEND2 mode
[ 48.823822] wake enabled for irq 119
[ 48.838208] usb3503 0-0008: switched to STANDBY mode
[ 48.838883] wake enabled for irq 123
[ 48.844391] dwc2 12480000.hsotg: suspending usb gadget g_ether
[ 48.844743] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
[ 48.844758] dwc2 12480000.hsotg: dwc2_hsotg_ep_disable: called for ep0
[ 49.030155] samsung-pinctrl 11000000.pinctrl: Setting external
wakeup interrupt wakeup mask: 0xfbfff7ff
[ 49.054626] Disabling non-boot CPUs ...
[ 49.172267]
[ 49.172889] =============================
[ 49.172895] WARNING: suspicious RCU usage
[ 49.172902] 4.18.0-rc1-xu3 #1 Not tainted
[ 49.172908] -----------------------------
[ 49.172917] kernel/sched/fair.c:6629 suspicious
rcu_dereference_check() usage!
[ 49.172922]
[ 49.172922] other info that might help us debug this:
[ 49.172922]
[ 49.172930]
[ 49.172930] RCU used illegally from offline CPU!
[ 49.172930] rcu_scheduler_active = 2, debug_locks = 0
[ 49.172938] 3 locks held by swapper/2/0:
[ 49.172944] #0: c108528f ((cpu_died).wait.lock){....}, at:
complete+0x14/0x48
[ 49.172978] #1: 5327b14b (&p->pi_lock){-.-.}, at: try_to_wake_up+0x38/0x620
[ 49.173008] #2: cb644f0e (rcu_read_lock){....}, at:
select_task_rq_fair+0x1b4/0x11a4
[ 49.173041]
[ 49.173041] stack backtrace:
[ 49.173050] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.18.0-rc1-xu3 #1
[ 49.173056] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[ 49.173070] [<c01130f0>] (unwind_backtrace) from [<c010ed7c>]
(show_stack+0x10/0x14)
[ 49.173084] [<c010ed7c>] (show_stack) from [<c0a3ad64>]
(dump_stack+0x98/0xc4)
[ 49.173099] [<c0a3ad64>] (dump_stack) from [<c0166a48>]
(select_task_rq_fair+0x5c8/0x11a4)
[ 49.173111] [<c0166a48>] (select_task_rq_fair) from [<c015aaac>]
(try_to_wake_up+0x168/0x620)
[ 49.173123] [<c015aaac>] (try_to_wake_up) from [<c0176c60>]
(__wake_up_common+0x8c/0x14c)
[ 49.173135] [<c0176c60>] (__wake_up_common) from [<c0176e24>]
(__wake_up_locked+0x18/0x20)
[ 49.173146] [<c0176e24>] (__wake_up_locked) from [<c0177c18>]
(complete+0x38/0x48)
[ 49.173159] [<c0177c18>] (complete) from [<c0111874>]
(arch_cpu_idle_dead+0x24/0x84)
[ 49.173171] [<c0111874>] (arch_cpu_idle_dead) from [<c0160e8c>]
(do_idle+0x1d0/0x2bc)
[ 49.173184] [<c0160e8c>] (do_idle) from [<c0161308>]
(cpu_startup_entry+0x18/0x1c)
[ 49.173195] [<c0161308>] (cpu_startup_entry) from [<4010280c>] (0x4010280c)
[ 49.232931] Enabling non-boot CPUs ...
[ 49.237088] CPU1 is up
[ 49.238630] CPU2 is up
[ 49.242535] CPU3 is up
[ 49.243777] s3c-i2c 13860000.i2c: slave address 0x00
[ 49.243834] s3c-i2c 13860000.i2c: bus frequency set to 390 KHz
[ 49.243862] s3c-i2c 13870000.i2c: slave address 0x00
[ 49.243876] s3c-i2c 13870000.i2c: bus frequency set to 97 KHz
[ 49.243899] s3c-i2c 13880000.i2c: slave address 0x00
[ 49.243913] s3c-i2c 13880000.i2c: bus frequency set to 97 KHz
[ 49.243935] s3c-i2c 138e0000.i2c: slave address 0x00
[ 49.243948] s3c-i2c 138e0000.i2c: bus frequency set to 97 KHz
[ 49.255899] s3c-rtc 10070000.rtc: rtc disabled, re-enabling
[ 49.256413] dwc2 12480000.hsotg: resuming usb gadget g_ether
[ 49.260032] usb usb1: root hub lost power or was reset
[ 49.260889] s3c2410-wdt 10060000.watchdog: watchdog disabled
[ 49.261036] wake disabled for irq 123
[ 49.270297] usb3503 0-0008: switched to HUB mode
[ 49.359166] wake disabled for irq 119
[ 49.376207]
[ 49.376213] ======================================================
[ 49.376218] WARNING: possible circular locking dependency detected
[ 49.376221] 4.18.0-rc1-xu3 #1 Not tainted
[ 49.376225] ------------------------------------------------------
[ 49.376228] swapper/2/0 is trying to acquire lock:
[ 49.376233] 54f93603 ((console_sem).lock){-...}, at: down_trylock+0xc/0x2c
[ 49.376244]
[ 49.376247] but task is already holding lock:
[ 49.376250] 5327b14b (&p->pi_lock){-.-.}, at: try_to_wake_up+0x38/0x620
[ 49.376261]
[ 49.376264] which lock already depends on the new lock.
[ 49.376266]
[ 49.376268]
[ 49.376272] the existing dependency chain (in reverse order) is:
[ 49.376274]
[ 49.376276] -> #1 (&p->pi_lock){-.-.}:
[ 49.376287] try_to_wake_up+0x38/0x620
[ 49.376290] up+0x4c/0x60
[ 49.376293] __up_console_sem+0x2c/0x58
[ 49.376295] console_unlock+0x3b4/0x644
[ 49.376298] con_set_unimap+0x140/0x22c
[ 49.376301] vt_ioctl+0x1364/0x1710
[ 49.376304] tty_ioctl+0xec/0xb54
[ 49.376307] do_vfs_ioctl+0xb0/0x9f8
[ 49.376310] ksys_ioctl+0x34/0x58
[ 49.376313] ret_fast_syscall+0x0/0x28
[ 49.376315] 0xbefc02a4
[ 49.376317]
[ 49.376320] -> #0 ((console_sem).lock){-...}:
[ 49.376331] _raw_spin_lock_irqsave+0x44/0x58
[ 49.376333] down_trylock+0xc/0x2c
[ 49.376337] __down_trylock_console_sem+0x24/0x88
[ 49.376340] console_trylock+0x10/0x58
[ 49.376343] vprintk_emit+0x224/0x420
[ 49.376346] vprintk_default+0x20/0x28
[ 49.376349] printk+0x30/0x54
[ 49.376352] lockdep_rcu_suspicious+0x2c/0x108
[ 49.376355] select_task_rq_fair+0x5c8/0x11a4
[ 49.376358] try_to_wake_up+0x168/0x620
[ 49.376361] __wake_up_common+0x8c/0x14c
[ 49.376364] __wake_up_locked+0x18/0x20
[ 49.376367] complete+0x38/0x48
[ 49.376370] arch_cpu_idle_dead+0x24/0x84
[ 49.376372] do_idle+0x1d0/0x2bc
[ 49.376375] cpu_startup_entry+0x18/0x1c
[ 49.376378] 0x4010280c
[ 49.376380]
[ 49.376383] other info that might help us debug this:
[ 49.376385]
[ 49.376388] Possible unsafe locking scenario:
[ 49.376391]
[ 49.376394] CPU0 CPU1
[ 49.376396] ---- ----
[ 49.376399] lock(&p->pi_lock);
[ 49.376406] lock((console_sem).lock);
[ 49.376413] lock(&p->pi_lock);
[ 49.376419] lock((console_sem).lock);
[ 49.376425]
[ 49.376428] *** DEADLOCK ***
[ 49.376430]
[ 49.376434] 3 locks held by swapper/2/0:
[ 49.376436] #0: c108528f ((cpu_died).wait.lock){....}, at:
complete+0x14/0x48
[ 49.376449] #1: 5327b14b (&p->pi_lock){-.-.}, at: try_to_wake_up+0x38/0x620
[ 49.376461] #2: cb644f0e (rcu_read_lock){....}, at:
select_task_rq_fair+0x1b4/0x11a4
[ 49.376473]
[ 49.376476] stack backtrace:
[ 49.376480] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.18.0-rc1-xu3 #1
[ 49.376483] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
[ 49.376487] [<c01130f0>] (unwind_backtrace) from [<c010ed7c>]
(show_stack+0x10/0x14)
[ 49.376491] [<c010ed7c>] (show_stack) from [<c0a3ad64>]
(dump_stack+0x98/0xc4)
[ 49.376495] [<c0a3ad64>] (dump_stack) from [<c0183a2c>]
(print_circular_bug.constprop.15+0x210/0x32c)
[ 49.376500] [<c0183a2c>] (print_circular_bug.constprop.15) from
[<c0186eac>] (__lock_acquire+0x155c/0x1ac8)
[ 49.376504] [<c0186eac>] (__lock_acquire) from [<c0187e38>]
(lock_acquire+0xe0/0x2bc)
[ 49.376508] [<c0187e38>] (lock_acquire) from [<c0a58604>]
(_raw_spin_lock_irqsave+0x44/0x58)
[ 49.376512] [<c0a58604>] (_raw_spin_lock_irqsave) from [<c0180390>]
(down_trylock+0xc/0x2c)
[ 49.376516] [<c0180390>] (down_trylock) from [<c0192878>]
(__down_trylock_console_sem+0x24/0x88)
[ 49.376521] [<c0192878>] (__down_trylock_console_sem) from
[<c01928ec>] (console_trylock+0x10/0x58)
[ 49.376525] [<c01928ec>] (console_trylock) from [<c0194544>]
(vprintk_emit+0x224/0x420)
[ 49.376529] [<c0194544>] (vprintk_emit) from [<c01948f0>]
(vprintk_default+0x20/0x28)
[ 49.376532] [<c01948f0>] (vprintk_default) from [<c0194d54>]
(printk+0x30/0x54)
[ 49.376536] [<c0194d54>] (printk) from [<c01836e8>]
(lockdep_rcu_suspicious+0x2c/0x108)
[ 49.376541] [<c01836e8>] (lockdep_rcu_suspicious) from [<c0166a48>]
(select_task_rq_fair+0x5c8/0x11a4)
[ 49.376545] [<c0166a48>] (select_task_rq_fair) from [<c015aaac>]
(try_to_wake_up+0x168/0x620)
[ 49.376549] [<c015aaac>] (try_to_wake_up) from [<c0176c60>]
(__wake_up_common+0x8c/0x14c)
[ 49.376553] [<c0176c60>] (__wake_up_common) from [<c0176e24>]
(__wake_up_locked+0x18/0x20)
[ 49.376557] [<c0176e24>] (__wake_up_locked) from [<c0177c18>]
(complete+0x38/0x48)
[ 49.376560] [<c0177c18>] (complete) from [<c0111874>]
(arch_cpu_idle_dead+0x24/0x84)
[ 49.376565] [<c0111874>] (arch_cpu_idle_dead) from [<c0160e8c>]
(do_idle+0x1d0/0x2bc)
[ 49.376569] [<c0160e8c>] (do_idle) from [<c0161308>]
(cpu_startup_entry+0x18/0x1c)
[ 49.376572] [<c0161308>] (cpu_startup_entry) from [<4010280c>] (0x4010280c)
[ 49.659576] usb 1-2: reset high-speed USB device number 2 using exynos-ehci
[ 50.009654] usb 1-3: reset high-speed USB device number 3 using exynos-ehci
[ 51.113111] OOM killer enabled.
[ 51.116204] Restarting tasks ... done.
[ 51.147734] PM: suspend exit
root@odroidu3:~# [ 51.713940] smsc95xx 1-2:1.0 eth0: link up,
100Mbps, full-duplex, lpa 0xC5E1

Best Regards
-Anand

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