[Yoshino][Lilac] Kernel panic: soft lockup: hung tasks

[stefanhh0]

Platform: Yoshino
Device: Lilac
Kernel version: 4.14.190-24471-ga99dfc594a76¹
Android version: android-10.0.0_r40
Software binaries version: SW_binaries_for_Xperia_Android_10.0.7.1_r1_v9c_yoshino.img
Version baseband: 1307-7511_47.2.A.11.228
Build: aosp_g8441-userdebug 10 QQ3A.200705.002 eng.stefan.20200728.091037²

Previously working on
I believe that the lockup occurred first after including the kernel PRs for 4.14.189, 4.14.190 and LA.UM.7.1.r1-16600-sm8150.0, but I am not 100% sure that it did not occur earlier as well. I had during my holidays last week several crashes and didn't collect the crash logs.

Description
I switched to flight mode and then typed whatsapp message. After a while phone was hanging for several seconds and then crashed and rebooted.

<0>[ 7084.019273] watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [cfinteractive:85]
<6>[ 7084.019511] Modules linked in:
<6>[ 7084.019544] CPU: 0 PID: 85 Comm: cfinteractive Tainted: G S      W       4.14.190-24471-ga99dfc594a76-dirty #1
<6>[ 7084.019554] Hardware name: SoMC Lilac-ROW(MSM8998 v2.1) (DT)
<6>[ 7084.019567] task: ffffffc0f81a2b80 task.stack: ffffffc0f8344000
<6>[ 7084.019595] pc : _raw_spin_unlock_irq+0x10/0x44
<6>[ 7084.019615] lr : __schedule+0xa0c/0xc9c
[...]
<6>[ 7084.020728] Call trace:
<6>[ 7084.020748]  _raw_spin_unlock_irq+0x10/0x44
<6>[ 7084.020766]  preempt_schedule+0x40/0x58
<6>[ 7084.020780]  _raw_spin_unlock_irqrestore+0x3c/0x44
<6>[ 7084.020802]  cpufreq_interactive_notifier+0xc4/0xe4
<6>[ 7084.020824]  srcu_notifier_call_chain+0x5c/0xa0
<6>[ 7084.020840]  cpufreq_notify_transition+0x1a0/0x21c
<6>[ 7084.020855]  cpufreq_freq_transition_end+0x30/0x90
<6>[ 7084.020874]  set_cpu_freq+0x11c/0x1f4
<6>[ 7084.020892]  msm_cpufreq_target+0x314/0x354
<6>[ 7084.020907]  __cpufreq_driver_target+0x68/0x52c
<6>[ 7084.020926]  cpufreq_interactive_speedchange_task+0x198/0x32c
<6>[ 7084.020942]  kthread+0x118/0x130
<6>[ 7084.020961]  ret_from_fork+0x10/0x18
<0>[ 7084.020976] Kernel panic - not syncing: softlockup: hung tasks

Maybe this lockup is related to one of the following:
#580
sonyxperiadev/kernel#2326
sonyxperiadev/kernel#2327
sonyxperiadev/kernel#2328

Symptoms
Phone is no longer reacting, after a while it reboots.

How to reproduce
I haven't found a way yet to reproduce it, currently it is a one time occurrence.

Additional context
console-ramoops-0.log
dmesg-ramoops-0.log
dmesg-ramoops-1.log
pmsg-ramoops-0.log

---

¹) The kernel commit can't be found on github:

• Base commit is: sonyxperiadev/kernel@c252081bf4a8
• Included PRs: 2327, 2328

²) SELinux: enforcing

[stefanhh0]

I didn't have such a lockup again, thus I will just close the issue for now.