I have a long list of questions if someone wouldnt mind taking some time to help me...
Ill just start with 3
1. Why does it turn itself off and back on again? I cant figure out whynit would do this. I read somewhere that apps can do that?
2. My phone is from att. And i used it to do the bring your own phone program for straight talk. Do i have to keep the att apps? Why cant i delete them. Like lg health.
3. Its super slow and i cant figure out why. I dont have any games. I dont have any extra apps maybe 5 total. Why does it run so slow?
Ty to anyone who would be willing to help.
Key...

Why does my activity show incallu but it says phone other times. What's the difference between the two

We are living in the 21st century. Future is on the hand of techs. Approximately 1 year ago Volterman group introduced a smart wallet that has a lot of features (GPS, wifi router, etc.). The main feature is a power bank. But if we calculate the capacity we can understand that if all features are working we will have very low space of battery.

Yesterday on IndieGoGo I see prelaunch of wallet campaign. The name of that campaign is Baraddy. Baraddy doesn't have lots of features like Volterman but it has a feature that we can use every day and it is more functional than Volterman. Here is the link that you can see that pre-launch campaign


ww.indiegogo.com/projects/baraddy/coming_soon/x/22129399

Hi friends I put the finger on the screen on the android phone and the value of "ViewPostImeInputStage processPointer 0 or 1" occurs on AndroidStudio Logcat according to the uninstall status. How can I access this value through MainActivity, for example, to handle this value?

Whats up with these droppers that app developers hide in their apps. Anybody that trust Google is a moron

Back in the day, Play Store app reviews showed the reviewer's name as "A Google user." Then, after...some event in Android/Google history, reviews were shown with the author's [presumably] real name.

Fast forward to today: there are many brand new, current reviews whose authors are shown as "A Google user." Others are shown with names like "I Just Made This Up"--in other words, clearly fake.

How can you post a review and have it show "A Google user" instead of your real name?

Of course, some obvious answers are make a fake account, or don't make an account, or...some other thing that doesn't make sense. For example, if you create a fake account, not only would it show your fake 'real' name, as opposed to "A Google user," but you couldn't review any of the apps you installed under your real account.

I *WANT* to post anonymously, i.e., as "A Google user," or with a nom de plume like on Amazon's reviews. But after searching every setting I can find, I'm coming up blank. How is it done?

I would greatly appreciate if there is anybody who can interpret this for me and tell me what it means. Something is going on with my phone and I want to know what

Hi.
The thing is ... I think i'm on a big trouble, I was trying to flash a stock ROM trough fastboot(because I had and HAVE no ROM) and well .. I'm running a MOTO G5s Plus (XT1800 - SANDERS), for some reason I don't know I mismatched potter with sanders, and flashed a potter rom (g5 plus) on my sanders phone, fastboot allowed that and well, system started and booted fine, but ofc camera,wifi and some other functions won't work ... I tried everything to go back to a sanders ROM, I have access to unlocked fastboot, TWRP, but no results as fastboot tell me that i'm running a POTTER ROM, but still tells me that my phone is a SANDERS ROM and ofc I can't flash any sanders rom.. any idea out there? I know this is crazy..

Fastboot getvar:


(bootloader) version: 0.5
(bootloader) version-bootloader: moto-msm8953-C2.12
(bootloader) product: sanders
(bootloader) board: sanders
(bootloader) secure: yes
(bootloader) hwrev: P4
(bootloader) radio: 3
(bootloader) storage-type: emmc
(bootloader) emmc: 32GB SAMSUNG RX1BMB RV=08 PV=07 FV=0000000000000007
(bootloader) ram: 3GB SAMSUNG LP3 DIE=6Gb M5=01 M6=05 M7=00 M8=7B
(bootloader) cpu: MSM8953
(bootloader) serialno: ZY322G2DJF
(bootloader) cid: 0x0032
(bootloader) channelid: 0x1a
(bootloader) uid: A0A21E0800000000000000000000
(bootloader) securestate: flashing_unlocked
(bootloader) iswarrantyvoid: yes
(bootloader) max-download-size: 534773760
(bootloader) reason: UTAG "bootmode" configured as fastboot
(bootloader) imei: ----------------
(bootloader) meid:
(bootloader) date: 02-14-2018
(bootloader) sku: XT1800
(bootloader) carrier_sku:
(bootloader) battid:
(bootloader) iccid:
(bootloader) cust_md5:
(bootloader) max-sparse-size: 268435456
(bootloader) current-time: "Thu Jan 1 18:54:31 UTC 1970"
(bootloader) ro.build.fingerprint[0]: motorola/potter_n/potter_n:8.1.0/O
(bootloader) ro.build.fingerprint[1]: PSS28.85-17-6/21457:user/release-k
(bootloader) ro.build.fingerprint[2]: eys
(bootloader) poweroffalarm: 0
(bootloader) ro.build.version.full[0]: Blur_Version.28.251.8.potter.reta
(bootloader) ro.build.version.full[1]: il.en.US
(bootloader) ro.build.version.qcom: LA.UM.6.6.r1-08600-89xx.0
(bootloader) version-baseband: M8953_41.50.07.85.01R DFLT_FSG
(bootloader) kernel.version[0]: Linux version 3.18.71-perf-gd0e0d1a (hud
(bootloader) kernel.version[1]: soncm@ilclbld33) (gcc version 4.9.x 2015
(bootloader) kernel.version[2]: 0123 (prerelease) (GCC) ) #1 SMP PREEMPT
(bootloader) kernel.version[3]: Fri Aug 10 22:52:41 CDT 2018
(bootloader) sbl1.git: git=MBM-NG-VC2.12-0-g698fb2f
(bootloader) rpm.git: git=92e5e21-dirty
(bootloader) tz.git: git=e619e20
(bootloader) devcfg.git: git=e619e20
(bootloader) keymaster.git: git=e619e20
(bootloader) cmnlib.git: git=e619e20
(bootloader) cmnlib64.git: git=e619e20
(bootloader) prov.git: git=e619e20
(bootloader) aboot.git: git=MBM-NG-VC2.12-0-g07ff23c
(bootloader) frp-state: no protection (0)
(bootloader) ro.carrier: retar
(bootloader) current-slot:
(bootloader) slot-suffixes: _a
(bootloader) slot-count: 1
(bootloader) slot-successful:_a: INVALID
(bootloader) slot-successful:_b: INVALID
(bootloader) slot-bootable:_a: INVALID
(bootloader) slot-bootable:_b: INVALID
(bootloader) slot-retry-count:_a: unknown
(bootloader) slot-retry-count:_b: unknown


As you can watch, XT1800 SANDERS is RUNNING a POTTER ROM ... I cant flash a sanders rom trough fastboot cause it will tell me ofc security downgrade and validation failed .. also running now on can't load kernel..
Ty.

UPDATE: As now, I can't find a newer Sanders firmware than the potter's one... so im stuck again. (SANDERS - 28.65, POTTER - 28.85)

I am traveling to Europe soon, and since the Z2 has dual sim capability will be buying a temporary sim card from Orange in France. Question: After I board the plane, I want to disable my North American Sim card to ensure I don't accidentally use it over there. Other than removing the sim card, is there any way to just disable it ( and ensure that I have the other sim working)? Thanks!

I bought a tablet in 2013 and the things just keeps on ticking. One problem i noticed is however the tablets default android is way too outdated that games do not even run at all or properly on it (especially newer games) as the devs do not support the older android versions. Buying a new one seems ridiculous as the tablet works fine.

I would like to flash or update my android version to something newer. How can i do this?

ASUS Model: ME302C

Android 4.3

Kernel: 3.4.43

I would like to at least get up to android 7.1.1 or higher.

I dont remember when or how, but i must of rooted this tablet a long time ago as if i run root checker, it says i have root. I use to that stuff many years ago, but havent done it in a long time. Based on this, i surely root it. But i am not sure if that matters if the only way is to flash it with a new android system?
https://androidforums.com/threads/constant-notifications-after-rooting-deleting.1008634/

My RCA tablet model # rct6s03w13h1 is not allowing for me to put in the previous Google account and when I do try it tells me that an unexpected error occured and that I have to wait for 24 hours is there anything or anyone who can help me solve this problem please

Hello, I want to create a TextView of a set size inside a horizontal linear layout, that is scrollable when the content gets too long for the TextView to properly display. Here's the XML structure I am currently using:
This however leads to the TextView elements inside the HorizontalScrollView elements to have their width be set to wrap_content. Manually changing this to match_parent or adding android:fillViewport="true" to the HorizontalScrollView elements did, unlike with normal ScrollView elements, not help.

This is what it looks like in the design view:


The HorizontalScrollView elements already have the correct size, the only issue is that the TextView elements inside of them do not allow their width to be set to match_parent. Is there something I missed?

After the last update, when I view my settings they screen is very dark and hard to see. Hopefully someone will know how to fix this as I can't figure out how. I have attached a picture of my settings screen. Also my status bar at the top is gone. I can drag it down and look at it but then is disappears. It used to be static. How do I get it back on the top?

Hi all. I am using the Samsung Galaxy S8+ (SM-G955FD), eith android Pie (9.0). After the latest update few weeks ago the samsung camera app (9.0.01.55) ceashes on load. I tried using (the rear camera) in another app and just fails. Only the front camera works in another app. Any ideas? Please help

I'm a truck driver and i want to use bluetooth speakers in my truck for music, but i also use a bluetooth headset to safely take calls while driving. Is there any way to pair both simultaneously without having music in the headset earphone? And, ideally, not interrupt music playback while on a call?

I keep getting email alerts with similar subject lines from two servers...notice anything odd?

HPE iLO 5 AlertMail: (INFO) Server power: 2681W exceeded the redundant power capacity threshold: 550W

I'm trying to figure out what app this heart belongs to?

I want to automate an action for an app i'm playing

In this app, you can watch an ad to get money
I want to automate this

However I don't know what to do to automate this

If you have any clue or any idea of what i should search for ^^
Thank you!
Is This A Good Question/Topic? 0

I wish to get help on and incoming call tracking App, designed with Android Studio

I was wondering what people’s thoughts are on the most effective pricing model for in-app purchases. Do you think you would make more money from pricing items individually and cheaply or bundling all items together for a larger price?

I’m thinking of in-app purchases for cosmetic things such as different color schemes, avatars etc where you could offer $0.50 per color scheme, or unlock all 10 for $2.00 for example.

I think for gaming apps, the little and often approach to unlocking new levels, vehicles etc would certainly win, but I’m less sure with a less ‘addictive’ app.

Hi,

I have a Fossil Q Explorist Gen 3 and I have two problems that I think are related. From time to time, I'll notice that my watch doesn't appear to be displaying up to date info, like if I have my phone battery being shown on the watch face, it'll be the % as it was several hours ago. Or maybe it'll occur to me that I haven't felt notifications on my wrist for a while. In any case, I do the following to 'fix' it:

1) On my watch, I go into settings and look at connectivity/wifi. I can see that 'automatic' is selected but the actual SSID displayed underneath might be, say, my home wifi whereas I am now at work. If I just wait a few seconds, it'll update to my work wi-fi...but if it is 'auomatic', surely it should already state my work wifi?
2) On my phone (Honor 9 Lite, Android 9), at this point,if I go into Wear OS. Advanced Settings, it'll often 'hang' if I try to look up my watch battery from there (I use this as a test to see if I can truly connect to my watch). If that's the case, disconnecting and reconnecting to the watch within Wear OS does nothing to help. However, if I turn bluetooth off and on again, connectivity with the watch is restored.

I *think* that I need to do both points 1 and 2 in order to get my watch functioning properly although perhaps point 2 alone would do it.

My question is; are there others out there who have had similar problems and did you do anything that was able to fix it once and for all?

Final point, and I'm not sure if this is the case 100% of the time, but I'm wondering if the problems start after I have used my bluetooth earphones. The phone doesn't throw up any obvious error; my earphones connect fine, I'll listen to music (and the bluetooth indicator states the make of the earphones while I'm connected) and then when I turn my earphones off, all appears to work normally afterwards. I'm just wondering now, as I write this, if my watch issues occur after this...

Thanks for any advice.

Sorry for going off topic, but looking to get a real answer to this issue my brother is having.

My brother is in FDOC, he has a JPS5 it is having heat issue, shutting down in 10 minutes . He says the device showed he used 20% of power by just righting an email to me. With that said he says when he can plug it in, the system can show being in red(30%> before plugging in but sometimes show has being (50%<) has soon has plugged in.

It is hard for me to help him without knowing what apps or settings he can use for optimization of the system like cleaning ram and closing down apps running.

He just learned how to delete music he said, not sure if that says he doesn't know much on device or if it's more the way it has to be done with it connected to kiosk.

We are looking into possibly just getting a second player for him, how would any apps, books, music or what have you be handled (be lost?) Or is it kind of like the play store where he could get them back?

Looking for upper lvl support ( Manager to call) today, they happen to be in a meeting at the time, if no call I will call again and see if they are in a meeting again.

Description: Framework reboot due to native crash in zygote crash with SIGSEGV error

Reproduction: Long duration test with multiple apps and reproduction rate – 1/100.

Description:

Below is the tombstone for zygote:

Line 56603:07-08 10:19:39.605 26565 26565 F DEBUG : Build fingerprint: ------------------------------------------------------------------
Line 56604: 07-08 10:19:39.605 26565 26565 F DEBUG : Revision: '0'
Line 56605: 07-08 10:19:39.605 26565 26565 F DEBUG : ABI: 'arm'
Line 56608: 07-08 10:19:39.606 26565 26565 F DEBUG : pid: 652, tid: 26546, name: HeapTaskDaemon >>> zygote <<<
Line 56609: 07-08 10:19:39.606 26565 26565 F DEBUG : signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x130
Line 56610: 07-08 10:19:39.606 26565 26565 F DEBUG : Cause: null pointer dereference
Line 56611: 07-08 10:19:39.606 26565 26565 F DEBUG : r0 dec0b000 r1 5616eb84 r2 00000007 r3 00000000
Line 56612: 07-08 10:19:39.606 26565 26565 F DEBUG : r4 00000130 r5 cd7929c8 r6 00000000 r7 e4fdc380
Line 56613: 07-08 10:19:39.606 26565 26565 F DEBUG : r8 cd7924bc r9 00000000 r10 00000002 r11 00008a0c
Line 56614: 07-08 10:19:39.607 26565 26565 F DEBUG : ip e49b8974 sp cd7924b0 lr e45e1507 pc e45ec316
Line 56712: 07-08 10:19:39.730 26565 26565 F DEBUG :
Line 56713: 07-08 10:19:39.730 26565 26565 F DEBUG : backtrace:
Line 56715: 07-08 10:19:39.730 26565 26565 F DEBUG : #00 pc 000aa316 /system/lib/libart.so (art::TimingLogger::Reset()+106)
Line 56716: 07-08 10:19:39.730 26565 26565 F DEBUG : #01 pc 0016663b /system/lib/libart.so (art::gc::collector::GarbageCollector::Run(art::gc::GcCause, bool)+178)
Line 56717: 07-08 10:19:39.730 26565 26565 F DEBUG : #02 pc 0018035d /system/lib/libart.so (art::gc::Heap::CollectGarbageInternal(art::gc::collector::GcType, art::gc::GcCause, bool)+2420)
Line 56718: 07-08 10:19:39.730 26565 26565 F DEBUG : #03 pc 0018dbeb /system/lib/libart.so (art::gc::Heap::ConcurrentGC(art::Thread*, art::gc::GcCause, bool)+182)
Line 56719: 07-08 10:19:39.730 26565 26565 F DEBUG : #04 pc 00191b11 /system/lib/libart.so (art::gc::Heap::ConcurrentGCTask::Run(art::Thread*)+20)
Line 56720: 07-08 10:19:39.730 26565 26565 F DEBUG : #05 pc 001aa957 /system/lib/libart.so (art::gc::TaskProcessor::RunAllTasks(art::Thread*)+34)
Line 56721: 07-08 10:19:39.731 26565 26565 F DEBUG : #06 pc 0007463b /system/framework/arm/boot-core-libart.oat (offset 0x73000) (dalvik.system.VMRuntime.clampGrowthLimit [DEDUPED]+74)
Line 56722: 07-08 10:19:39.731 26565 26565 F DEBUG : #07 pc 0014a85d /system/framework/arm/boot-core-libart.oat (offset 0x73000) (java.lang.Daemons$HeapTaskDaemon.runInternal+172)
Line 56723: 07-08 10:19:39.731 26565 26565 F DEBUG : #08 pc 000ec963 /system/framework/arm/boot-core-libart.oat (offset 0x73000) (java.lang.Daemons$Daemon.run+66)
Line 56724: 07-08 10:19:39.731 26565 26565 F DEBUG : #09 pc 002151b1 /system/framework/arm/boot-core-oj.oat (offset 0x106000) (java.lang.Thread.run+64)
Line 56725: 07-08 10:19:39.731 26565 26565 F DEBUG : #10 pc 00411575 /system/lib/libart.so (art_quick_invoke_stub_internal+68)
Line 56726: 07-08 10:19:39.731 26565 26565 F DEBUG : #11 pc 003eb045 /system/lib/libart.so (art_quick_invoke_stub+224)
Line 56727: 07-08 10:19:39.731 26565 26565 F DEBUG : #12 pc 000a183d /system/lib/libart.so (art::ArtMethod::Invoke(art::Thread*, unsigned int*, unsigned int, art::JValue*, char const*)+136)
Line 56728: 07-08 10:19:39.731 26565 26565 F DEBUG : #13 pc 003498d5 /system/lib/libart.so (art:anonymous namespace)::InvokeWithArgArray(art::ScopedObjectAccessAlreadyRunnable const&, art::ArtMethod*, art:anonymous namespace)::ArgArray*, art::JValue*, char const*)+52)
Line 56729: 07-08 10:19:39.731 26565 26565 F DEBUG : #14 pc 0034a62d /system/lib/libart.so (art::InvokeVirtualOrInterfaceWithJValues(art::ScopedObjectAccessAlreadyRunnable const&, _jobject*, _jmethodID*, jvalue*)+320)
Line 56730: 07-08 10:19:39.731 26565 26565 F DEBUG : #15 pc 0036d0a3 /system/lib/libart.so (art::Thread::CreateCallback(void*)+866)
Line 56731: 07-08 10:19:39.731 26565 26565 F DEBUG : #16 pc 00072dcd /system/lib/libc.so (__pthread_start(void*)+22)
Line 56732: 07-08 10:19:39.731 26565 26565 F DEBUG : #17 pc 0001e3b1 /system/lib/libc.so (__start_thread+24)



One more observation is that we saw few app crashes prior to zygote crash in the path of zygote forking these apps.


pid: 17395, tid: 17395, name: o.android.imoi >>> zygote <<<
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x4
Cause: null pointer dereference
r0 00000000 r1 8b148311 r2 00000000 r3 00000000
r4 e4bdc424 r5 e4bdc420 r6 e4b97a64 r7 e4bdc3c8
r8 e4bc8000 r9 e4bdc448 r10 00003000 r11 00000003
ip 000000ff sp ffbe1230 lr e41e7dd5 pc e41e7de8

backtrace:
#00 pc 000a8de8 /system/lib/libart.so (art::CumulativeLogger::Reset()+68)
#01 pc 00166901 /system/lib/libart.so (art::gc::collector::GarbageCollector:: ()+192)
#02 pc 0017d853 /system/lib/libart.so (art::gc::Heap::ResetGcPerformanceInfo()+34)
#03 pc 003570db /system/lib/libart.so (art::Runtime::InitNonZygoteOrPostFork(_JNIEnv*, bool, art::Runtime::NativeBridgeAction, char const*, bool)+74)
#04 pc 002e8fb7 /system/lib/libart.so (art::ZygoteHooks_nativePostForkChild(_JNIEnv*, _jclass*, long long, int, unsigned char, unsigned char, _jstring*)+3146)
#05 pc 00074c63 /system/framework/arm/boot-core-libart.oat (offset 0x73000) (dalvik.system.ZygoteHooks.nativePostForkChild+154)
#06 pc 000eba15 /system/framework/arm/boot-core-libart.oat (offset 0x73000) (dalvik.system.ZygoteHooks.postForkChild+68)
#07 pc 00ba0ab9 /system/framework/arm/boot-framework.oat (offset 0x393000) (com.android.internal.os.Zygote.callPostForkChildHooks+80)
#08 pc 00412975 /system/lib/libart.so (art_quick_invoke_stub_internal+68)
#09 pc 003eaec7 /system/lib/libart.so (art_quick_invoke_static_stub+222)
#10 pc 000a184f /system/lib/libart.so (art::ArtMethod::Invoke(art::Thread*, unsigned int*, unsigned int, art::JValue*, char const*)+154)
#11 pc 00349655 /system/lib/libart.so (art:anonymous namespace)::InvokeWithArgArray(art::ScopedObjectAccessAlreadyRunnable const&, art::ArtMethod*, art:anonymous namespace)::ArgArray*, art::JValue*, char const*)+52)
#12 pc 0034947f /system/lib/libart.so (art::InvokeWithVarArgs(art::ScopedObjectAccessAlreadyRunnable const&, _jobject*, _jmethodID*, std::__va_list)+310)
#13 pc 00290219 /system/lib/libart.so (art::JNI::CallStaticVoidMethodV(_JNIEnv*, _jclass*, _jmethodID*, std::__va_list)+444)
#14 pc 0006e579 /system/lib/libandroid_runtime.so (_JNIEnv::CallStaticVoidMethod(_jclass*, _jmethodID*, ...)+28)
#15 pc 0011c2ed /system/lib/libandroid_runtime.so ((anonymous namespace)::ForkAndSpecializeCommon(_JNIEnv*, unsigned int, unsigned int, _jintArray*, int, _jobjectArray*, long long, long long, int, _jstring*, _jstring*, bool, _jintArray*, _jintArray*, bool, _jstring*, _jstring*)+4052)
#16 pc 0011ab37 /system/lib/libandroid_runtime.so (android::com_android_internal_os_Zygote_nativeForkAndSpecialize(_JNIEnv*, _jclass*, int, int, _jintArray*, int, _jobjectArray*, int, _jstring*, _jstring*, _jintArray*, _jintArray*, unsigned char, _jstring*, _jstring*)+470)
#17 pc 003b8ba3 /system/framework/arm/boot-framework.oat (offset 0x393000) (com.android.internal.os.Zygote.nativeForkAndSpecialize+338)
#18 pc 00ba3a8b /system/framework/arm/boot-framework.oat (offset 0x393000) (com.android.internal.os.ZygoteConnection.processOneCommand+1450)
#19 pc 00ba7a5b /system/framework/arm/boot-framework.oat (offset 0x393000) (com.android.internal.os.ZygoteServer.runSelectLoop+770)
#20 pc 00ba5269 /system/framework/arm/boot-framework.oat (offset 0x393000) (com.android.internal.os.ZygoteInit.main+1696)
#21 pc 00412975 /system/lib/libart.so (art_quick_invoke_stub_internal+68)
#22 pc 003eaec7 /system/lib/libart.so (art_quick_invoke_static_stub+222)
#23 pc 000a184f /system/lib/libart.so (art::ArtMethod::Invoke(art::Thread*, unsigned int*, unsigned int, art::JValue*, char const*)+154)
#24 pc 00349655 /system/lib/libart.so (art:anonymous namespace)::InvokeWithArgArray(art::ScopedObjectAccessAlreadyRunnable const&, art::ArtMethod*, art:anonymous namespace)::ArgArray*, art::JValue*, char const*)+52)
#25 pc 0034947f /system/lib/libart.so (art::InvokeWithVarArgs(art::ScopedObjectAccessAlreadyRunnable const&, _jobject*, _jmethodID*, std::__va_list)+310)
#26 pc 00290219 /system/lib/libart.so (art::JNI::CallStaticVoidMethodV(_JNIEnv*, _jclass*, _jmethodID*, std::__va_list)+444)
#27 pc 0006e579 /system/lib/libandroid_runtime.so (_JNIEnv::CallStaticVoidMethod(_jclass*, _jmethodID*, ...)+28)
#28 pc 0007073b /system/lib/libandroid_runtime.so (android::AndroidRuntime::start(char const*, android::Vector<android::String8> const&, bool)+462)
#29 pc 00001c8f /system/bin/app_process32 (main+1122)
#30 pc 000a2245 /system/lib/libc.so (__libc_init+48)
#31 pc 000017eb /system/bin/app_process32 (_start_main+38)
#32 pc 000000c4 <unknown>




Analysis:


Loaded coredump in GDB:


#0 art::TimingLogger::Reset (this=0x130) at art/runtime/base/timing_logger.cc:148
No locals.
#1 0xe46a863e in Reset (this=0x120, gc_cause=<optimized out>, clear_soft_references=<optimized out>) at art/runtime/gc/collector/garbage_collector.cc:49
No locals.
#2 art::gc::collector::GarbageCollector::Run (this=0xe4fdc380, gc_cause=art::gc::kGcCauseBackground, clear_soft_references=true) at art/runtime/gc/collector/garbage_collector.cc:92
start_time = 151785656375586
current_iteration = 0x120
end_time = <optimized out>
self = <optimized out>
#3 0xe46c2360 in art::gc::Heap::CollectGarbageInternal (this=0xe4f3c800, gc_type=art::gc::collector::kGcTypeFull, gc_cause=art::gc::kGcCauseBackground, clear_soft_references=<optimized out>)
at art/runtime/gc/heap.cc:2648
runtime = 0xe4f3c400
self = 0xe42acc00
collector = 0xe4fdc380
#4 0xe46cfbee in art::gc::Heap::ConcurrentGC (this=0xe4f3c800, self=0xe42acc00, cause=art::gc::kGcCauseBackground, force_full=<optimized out>) at art/runtime/gc/heap.cc:3675
next_gc_type = art::gc::collector::kGcTypeSticky
tid = 26546
#5 0xe46d3b14 in art::gc::Heap::ConcurrentGCTask::Run (this=<optimized out>, self=0x5616eb84) at art/runtime/gc/heap.cc:3620
heap = 0xe4f3c800
#6 0xe46ec958 in art::gc::TaskProcessor::RunAllTasks (this=0xe4f30200, self=0xe42acc00) at art/runtime/gc/task_processor.cc:129
task = 0xdec08000
#7 0x720bc63c in ?? ()


From here, we see that at frame 2, current_iteration = 0x120 is holding invalid address, which is a member of garbage collector class, see below code for reference.


In file -- art/runtime/gc/collector/garbage_collector.cc


91 Iteration* current_iteration = GetCurrentIteration();
92 current_iteration->Reset(gc_cause, clear_soft_references);



429 const collector::Iteration* GetCurrentGcIteration() const {
430 return &current_gc_iteration_;
431 }


1254 collector::Iteration current_gc_iteration_;


And we see the collector object being zeroed out, which seems to be the reason for our crash.


gdb) f 2
#2 art::gc::collector::GarbageCollector::Run (this=0xe4fdc380, gc_cause=art::gc::kGcCauseBackground, clear_soft_references=true) at art/runtime/gc/collector/garbage_collector.cc:92
92 in art/runtime/gc/collector/garbage_collector.cc
(gdb) x/100 this
0xe4fdc380: 0 0 0 0
0xe4fdc390: 0 0 0 0
0xe4fdc3a0: 0 0 0 0
0xe4fdc3b0: 0 0 0 0
0xe4fdc3c0: 0 0 0 0
0xe4fdc3d0: 0 0 0 0
0xe4fdc3e0: 0 0 0 0
0xe4fdc3f0: 0 0 0 0
0xe4fdc400: 0 0 0 0
0xe4fdc410: 0 0 0 0
0xe4fdc420: 0 0 0 0
0xe4fdc430: 0 0 0 0
0xe4fdc440: 0 0 0 0
0xe4fdc450: 0 0 0 0
0xe4fdc460: 0 0 0 0
0xe4fdc470: 0 0 0 0
0xe4fdc480: 0 0 0 0
0xe4fdc490: 0 0 0 0
0xe4fdc4a0: 0 0 0 0
0xe4fdc4b0: 0 0 0 0
0xe4fdc4c0: 0 0 0 0
0xe4fdc4d0: 0 0 0 0
0xe4fdc4e0: 0 0 0 0
0xe4fdc4f0: 0 0 0 0

The app crashes seen prior to this zygote crash also seem be to due to similar reason, collector object being NULL.

Debug approaches -
We have internally tried to use ASAN and malloc_debug to check is such corruptions can be caught.
Unfortunately, after enabling malloc_debug, issue was not reproducible.
And with ASAN enablement, device runs slow, and results in other unrelated issues.


Can you please help to provide any debug suggestions/ share any similar instances of this issue ?


Regards,
Deepika

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