Editando Panes no kernel de iPhones

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A hub for kernel panics or crash logs you may find in your iOS devices.  Descriptions of their meanings and places to look for resolution.

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If your iPhone is shutting down or rebooting unexpectedly, chances are there is documentation of this issue in your phone. Diving into your logs seems like a daunting task. But if you know what to look for, it can provide invaluable data about the nature of the problem.

This page is by no means a complete list. If your panic isn't listed, [link|https://www.ifixit.com/Answers|post in the answers forum]! Someone else is bound to have  experienced the same thing.

== What Is a Panic? ==

In terms of macOS, iOS and other Unix based Operating Systems, a kernel panic is an error the operating system encounters that it cannot readily recover from. In many ways, it is comparable to a Windows Blue Screen of Death. It manifests as an unexpected shutdown, or reboot.

If your phone is rebooting unexpectedly, there is a very good chance it's a kernel panic. You just didn't know that's what it's called.

In iOS devices, kernel panics nearly always indicate a hardware issue.

== How to Find a Panic Log ==

iPhones store system logs in a menu seldom tread by the average user—deep in the caverns of the analytics settings.

# Open the ***Settings*** app.
# Navigate to Privacy
# Scroll to the bottom and open “***Analytics & Improvements***”
** ***NOTE***: The exact verbiage of this menu name will depend on the version of iOS your phone is running.
# Open ***Analytics Data.***
# Scroll through the alphabetically presented list to the “P” section and skim for any entries with the word panic in the title. Usually they are listed as ***panic.full***, followed by the date and time the panic occurred.

== Reading a Panic Log ==

There is an abundance of extraneous information in these logs. Skim through the first bit to find the ***panic string.*** This is the error that ultimately led to the crash.  This error may also  be listed  without the panic string verbiage immediately following the CPU caller (this simply means which bit of the CPU reported the issue). There may even be helpful data beyond that in the first screen or so of text.

* Use your brain. You may encounter terms found elsewhere in electronics. For example, WLAN is often used to reference Wi-Fi. Issues with your WiFi chip, or antenna, is a logical conclusion if you see WLAN in a panic log.
* You may find things in the log which refer to specific logic board components.  Names like [product|IF126-039|Tristar|new_window=true], [product|IF268-074|Tigris|new_window=true], Chestnut, and many others can give clues.
* Ultimately, if you see data which looks like it's not just a string of meaningless letters and numbers, do some research. You'll be surprised at what you can learn from these logs, even if you're not a software engineer.
* Bear in mind that reading panic logs is not an exact science. There is no absolute cause and effect. The same panic string could have five different solutions. A panic log is a clue, and nothing more.

Use [link|https://www.panicfull.com/|panic.full] or [link|https://github.com/waynebonc/iDeviceLogAnalyzer-public|iDevice Panic Log Analyze]r as a quick way to get data on your crash. But without context this may just spit out a bunch of info you're not sure what to do with.

== Types of Panics ==

=== Watchdog Timeout Thermalmonitord Missing Sensor ===

Included in its system processes, iOS contains a regular check of sensor input. If it does not hear from these sensors within three minutes, it reboots the phone. [link|https://www.ifixit.com/User/739239/jessabethany|Jessa] at iPad Rehab has done a [link|https://www.ipadrehab.com/article.cfm?ArticleNumber=49|rather extensive write up] on this specific issue.

To get to cause, keep reading past the panic string to find the missing sensor.

{table
|width=100%
|format=30%cm:cm:cm:cm
|! Missing Sensor
|! Location
|! Likely Issue
|--
| PRS0 - Barometer[br]
| <<rowspan="2">> On the Charge Port Assembly[br]
| <<rowspan="2">> Charge Port Assembly or its connector on the Logic Board
|--
| Mic1 - Bottom Microphone
|--
| Mic2 - Rear Microphone[br]
| Power Button Cable, Camera Flash Cable
| Power Button Cable, Camera Flash Cable or its respective connector on the Logic Board
|--
| TG0V
| <<rowspan="2">> Battery sensors, most likely for temperature and voltage
| <<rowspan="2">> Battery or its connector on the Logic Board, Charge Port Assembly on 11 Pro and Pro Max,  charging circuitry on the board level.
|--
| TG0B
}

* Other sensors are less well documented, and may require some context since Apple does not publicize locations or names of sensors. iPads [post|730010|appear to have some vital sensors on the display|new_window=true]. [post|728588|Board level sensors also exist|new_window=true], but suffer from the same guesswork at nomenclature.

=== Watchdog Timeout No Check In ===

The Watchdog Timeout process checks for overall functionality of the system. If the amount of time between check ins exceeds the maximum (typically 180 seconds), the device reboots to attempt to correct this.

* Rather than a missing sensor as previously discussed, you may also get a check in failure from a software component. ***Springboard***, ***logd***, ***wifid*** or ***thermalmonitord*** (with no reference to a missing sensor) are common. Although these processes may correlate to a hardware component, this is typically a software issue.
* This issue has cropped up commonly in early versions of iOS 16. The solution is generally to ensure you have a backup and restore your phone's software.
* It remains to be seen whether Apple has corrected this with iOS 16.2, but attempting to update is worth a go if you don't want to backup. Try using the Recovery Mode method to process the install to avoid reboots mid process.

=== i2c ===

i2c or i²c, if you want to be technically correct, is an electronics based protocol used for communication between a net of chips. This includes a master and any number of minions it sends commands to.

I won't get too into the weeds on [link|https://www.circuitbasics.com/basics-of-the-i2c-communication-protocol/|how this works], but in many cases, the master chip is the CPU. As you can imagine, if the CPU does not get information it needs, or commands it sends aren't received, bad stuff happens.

This particular panic will need lots of context. iPhones contain several different i2c "channels" and which components talk on which channel varies by model.

* The [post|748488|panic may include some other clues|new_window=true]. Part names like ALS for Ambient Light Sensor or others may appear in the verbiage.
* Having access to the schematic will make deciphering this panic much easier since it will tell you which components communicate on which channels. It may also give you addresses for the problematic chip.

=== AOP Panics ===

AOP  panics are a whole subset of panic types. AOP is the Always On Processor, a segment of the CPU that runs functions that are always on. Always On functions can run even when the device is off. Recent updates to the Find My network allowing the device to continue transmitting its location in an off state, [link|https://naehrdine.blogspot.com/2021/09/always-on-processor-magic-how-find-my.html|likely make use of this tech].

==== AOP NMI POWER ====

An NMI is a "Non-Maskable Interrupt." In plain terms it's information which cannot be ignored and can interrupt the transmission of other signals. It is usually intended to be used for some sort of error, or system resets.

* This panic is often affiliated with the power button cable, or the front facing camera assembly.

==== AOP Panic - K2 - Bosch control channel write failure ====

This panic typically occurs during audio related functions, like turning up the volume to maximum.

* Because the [parts|Phone|charge port flex assembly|itemtype=cables] carries signals from the speaker to the board, damage to this assembly is the most common cause for this panic.
* Check for liquid damage to be certain and replace with a high quality, or OEM replacement if possible.

=== ANS2 Recoverable Panic ===

ANS2 (Apple NAND Storage version 2) is Apple’s controller for, you guessed it, storage. NAND is a type of flash memory commonly used in modern smartphones and computers with soldered on storage.

* If you get this panic, chances are the chip which houses all the data on your phone is malfunctioning or communication lines to the NAND are not functioning properly.
* Replacing the NAND requires microsoldering skills and the use of a programmer to write unique data from the old NAND chip to the new one.

=== AppleSocHot: Hot Hot Hot ===

Sometimes software developers have more fun coding in what occurs in times of error than other things because they are likely to be the only ones that see them. This error is pretty straight forward. Your CPU is not just hot—it's Hot Hot Hot.

* This specific panic refers to an electrical line between the Power Management chip and the CPU. It could in fact mean your CPU is getting too hot. It could also mean, a board level issue with this line.
* Regardless of the specifics, this is almost certainly a logic board issue, not a parts problem.
* The CPU is most likely getting hot due to some other board component. Check any areas that may have had work done. WiFi and audio related components are often the root cause.

=== SEP ROM Boot Panic ===

The Secure Enclave Processor or SEP is the part of an i[link|https://support.apple.com/guide/security/secure-enclave-sec59b0b31ff/1/web/1|Phone subsystem which handles all protected, sensitive data for an iPhone]. Things like encryption keys and fingerprint or facial identification data. The Read-only Memory or SEP ROM is an integral part of this system which verifies trust between systems.

* A SEP ROM panic indicates the ROM chip or the communication between it and the CPU is damaged.
* The data on the SEP ROM is unique so if it is damaged, it cannot be recreated. [link|https://www.youtube.com/watch?v=VdaniLIgAHo|There are readers which may allow you to pull the data off], but it can spell disaster for the phone.

=== SMC Panic Assertion Failed ===

The SMC, or System Management controller will be familiar to those who have ever done any sort of troubleshooting on a MacBook. iPhones also include an SMC, but rather than being its own chip, it is part of the CPU. These panics often make mention of the error BSC FAILURE.

* Assertion Failed type panics have begun cropping up in iPhone 13 and later models. Similar to a Watchdog Timeout, they reboot the device at the three minute mark if sensor data is not received.
* The log will generally mention an affected sensor array followed by a code. Refer to the dedicated [[iPhone SMC Panic Assertion Failed|Panic Assertion Failed wiki]] to find which code correlates to your panic.

=== Undefined Kernel Instruction ===

This kernel of an Operating System is exactly what it sounds like—the core parts. If Instructions are undefined, often this is because the instructions are damaged or not functioning properly.

* Generally this is a software issue. Check for OS updates, or even app updates.
* If updates do not resolve, you may need to reinstall or restore the operating system altogether.
* If the issue continues to occur beyond this, you’re most likely looking at an issue with system involved in RAM or the NAND storage. This is where instructions tend to be located and when those components, or their board related systems are damaged, so can the information they’re housing or transmitting.

== Additional Resources ==

* [link|https://www.ipadrehab.com/article.cfm?ArticleNumber=49|Troubleshooting Thermal Sensor Problems]
* [link|https://repair.wiki/w/How_To_Fix_an_iPhone_14_Pro_That_Randomly_Restarts|How To Fix an iPhone 14 Pro That Randomly Restarts|new_window=true]
* [link|https://www.youtube.com/watch?v=V_GEGB0lerU|Video: What Is Causing Your iPhone To Randomly Restart?]

Português

[title|Panes no kernel de iPhones]

[summary]Uma central de panes no kernel ou crash logs que podem acontecer nos seus dispositivos iOS. Descrições de seus significados e locais para se procurar por resolução.[/summary]

[summary_image|2728560]

Se o seu iPhone está desligando ou reiniciando de forma inesperada, há boas chances de que haja algo documentando esta falha no seu telefone. Estudar os seus logs parece ser uma tarefa bem complicada. Mas se você sabe por o que precisa procurar, eles te podem fornecer dados inestimáveis sobre a natureza da falha.

Esta página não oferece de forma alguma uma lista completa das panes. Se não encontrar sua pane na lista, [link|https://www.ifixit.com/Answers|escreva uma mensagem no fórum de Respostas]! Alguma outra pessoa provavelmente já teve o mesmo problema.

== O que é uma pane? ==

Em termos de macOS, iOS e outros sistemas operacionais baseados em Unix, uma pane no kernel é um erro que afeta o sistema operacional e do qual ele não consegue se recuperar. Em muitas maneiras, é comparável a uma tela azul da morte no Windows. E ela se manifesta com um desligamento ou reinicialização inesperado(a).

Se o seu telefone estiver reiniciando de forma inesperada, muito provavelmente trata-se de uma pane no kernel. Você só não sabia como como isso se chamava.

Em dispositivo iOS, as panes no kernel quase sempre indicam um problema de hardware.

== Como encontrar um log da pane ==

Os iPhones armazenam logs do sistema em um menu pouco conhecido pelo usuário padrão, nas profundezas das cavernas das configurações das Analytics.

# Abra o app ***Configurações***.
# Vá para Privacidade
# Role até o final e abra “***Analytics & Improvements***”
** ***OBS.***: A nomenclatura exata deste menu dependerá da versão de iOS em que seu telefone está rodando.
# Abra ***Dados analíticos.***
# Role pela lista alfabética até o “P” e procure pela palavra pane (em inglês ''panic'') no título. Geralmente, elas estão listadas como ***panic.full***, seguidas pela data e horário em que a pane ocorreu.

== Leitura de um log de pane ==

Há muitíssimas informações estranhas nestes logs. Vasulhe pelas primeiras até encontrar o ***string panic.*** Este é o erro que levou à falha. Este erro também pode ser exibido sem a descrição do string da pane imediatamente após o caller no CPU (que significa simplesmente qual bit do CPU reportou a falha). Ainda podem haver dados úteis depois da primeira tela de texto.

* Use a sua mente. Pode ser que você ache termos em outras partes da eletrônica. Por exemplo, frequentemente usa-se WLAN para se referir ao Wi-Fi. Falhas com o seu chip do WiFi, ou com a antena, são uma conclusão lógica caso você leia WLAN no log da pane.
* Pode ser que você encontre algo no log referindo-se a componentes específicos da placa lógica. Nomes como [product|IF126-039|Tristar|new_window=true], [product|IF268-074|Tigris|new_window=true], Chestnut e muitos outros podem dar pistas quentes.
* No final das contas, se você vir dados que não parecem ser somente uma cadeia de letras e número sem sentido algum, pesquise. Você se surpreenderá com o que pode aprender desses logs, mesmo se você não for um engenheiro de software.
* Tenha em mente que ler logs de panes não é uma ciência exata. Não há uma causa ou um efeito absolutos. O mesmo string de pane pode ter cinco soluções diferentes. Um log de pane é uma pista, e mais nada.

Use [link|https://www.panicfull.com/|panic.full] ou o [link|https://github.com/waynebonc/iDeviceLogAnalyzer-public|iDevice Panic Log Analyzer] para receber dados sobre a falha mais rapidamente. Mas sem contexto algum, tudo o que você terá é um monte de informações desorganizadas, com as quais você não saberá o que fazer.

== Tipos de panes ==

=== Watchdog Timeout Thermalmonitord Missing Sensor ===

Dentro de seus processos do sistema, o iOS tem um controle regular da entrada dos sensores. Se ele não receber nenhum sinal desses sensores num intervalo de três minutos, ele faz um reboot do telefone. [link|https://www.ifixit.com/User/739239/jessabethany|Jessa] da iPad Rehab fez [link|https://www.ipadrehab.com/article.cfm?ArticleNumber=49|umas anotações bem abrangentes] sobre esta falha específica.

Para chegar à causa, continue lendo depois do string da pane para encontrar o sensor que está faltando.

{table
|width=100%
|format=30%cm:cm:cm:cm
|! Sensor ausente
|! Local
|! Causa provável
|--
| PRS0 - Barômetro[br]
| <<rowspan="2">> Conjunto Porta de carregamento[br]
| <<rowspan="2">> Conjunto Porta de carregamento ou seu conector na placa lógica
|--
| Mic1 - Microfone inferior
|--
| Mic2 - Microfone traseiro[br]
| Cabo botão lig/deslig, cabo flash da câmera
| Cabo botão lig/deslig, cabo flash da câmera ou seu respectivo conector na placa lógica
|--
| TG0V
| <<rowspan="2">> Sensores da bateria, provavelmente de temperatura e voltagem
| <<rowspan="2">> Bateria ou seu conector na placa lógica, conjunto Porta de carregamento no 11 Pro e Pro Max, circuito de carga no nível da placa.
|--
| TG0B
}

* Outros sensores são menos documentados e podem precisar de mais contexto, pois a Apple não publica os locais ou nomes dos sensores. Os iPads [post|730010|parecem ter alguns sensores importantes na tela|new_window=true]. [post|728588|Sensores a nível de placa também existem|new_window=true], mas sofrem do mesmo problema com a nomenclatura.

=== Watchdog Timeout No Check In ===

O processo Watchdog Timeout controla a funcionalidade geral do sistema. Se o intervalo de tempo entre as entradas exceder o tempo máximo (tipicamente, 180 segundos), o dispositivo faz um reboot para tentar corrigir este problema.

* WEm vez de um sensor ausente, como discutido anteriormente, pode ser que você esteja tendo uma falha de entrada de um componente de software. ***Springboard***, ***logd***, ***wifid*** ou ***thermalmonitord*** (sem referência a um sensor ausente) são falhas comuns. Apesar de esses processos poderem ter uma correlação com um componente de hardware, eles indicam tipicamente uma falha no software.
* Esta falha surgiu comumente nas primeiras versões do iOS 16. A solução é geralmente garantir que você fez backup e armazenou o software de seu telefone.
* Resta saber se a Apple corrigiu este problema com o iOS 16.2, mas vale a pena tentar atualizar, caso você não queira fazer nenhum backup. Tente usando o modo de recuperação (Recovery Mode) para processar a instalação para evitar reinicializações no meio de um processo.

=== i2c ===

i2c ou i²c, se você preferir ser tecnicamente correto, é um protocolo baseado em eletrônica usado para a comunicação entre uma rede de chips. A qual inclui um mestre e um número extenso de minions para os quais ele envia comendos.

Não quero entrar muito em detalhes sobre [link|https://www.circuitbasics.com/basics-of-the-i2c-communication-protocol/|como ele funciona], mas em muitos casos o chip master é a CPU. Como você pode imaginar, se a CPU não recebe a informação que precisa, ou os comandos que ela envia não são recebidos, acontecem coisas ruins.

Esta pane em particular vai precisar de muito contexto. Os iPhones contêm muitos "canais" i2c diferentes e quais componentes se comunicam por qual canal varia de modelo para modelo.

* A [post|748488|pane pode incluir algumas outras pistas|new_window=true]. Nomes de peças como ALS para Ambient Light Sensor (sensor de luz ambiente) ou outros podem aparecer na descrição.
* Se você tiver acesso ao esquema, decifrar esta pane ficará muito mais fácil, pois naquele constará quais componentes comunicam em quais canais. Além disso, pode ser que ele te dê os endereços do chip problemático.

=== Panes no AOP ===

Panes no AOP perfazem toda uma subcategoria de panes. O AOP é o Always On Processor, um segmento da CPU que roda funções que ficam sempre ligadas. As funções Always On podem rodar até mesmo quando o dispositivo está desligado. Atualizações recentes do Find My Network permitem que o dispositivo continue transmitindo a sua localização em um estado desligado, [link|https://naehrdine.blogspot.com/2021/09/always-on-processor-magic-how-find-my.html|provavelmente fazem uso desta tecnologia].

==== AOP NMI POWER ====

Um NMI é um "Non-Maskable Interrupt" (interrupção não mascarável). Em linguagem clara, trata-se de informações que não podem ser ignoradas e que podem interromper a transmissão de outros sinais. Ele costuma ser designado ao uso para algum tipo de erro ou de restaurações do sistema.

* Esta pane está frequentemente associada ao cabo do botão lig/deslig, ou ao conjunto da câmera frontal.

==== Pane AOP - K2 - Falha de escrita no canal de controle Bosch ====

Esta pane ocorre tipicamente durante funções relacionadas ao áudio, como aumentar o volume ao máximo.

* Como o [parts|Phone|conjunto do cabo flex da porta de carregamento|itemtype=cables] transmite sinais do alto-falante para a placa, a causa mais comum para esta pane é um dano neste conjunto.
* Verifique se não há um dano causado por líquido para ter certeza e troque por uma peça de alta qualidade ou OEM, se possível.

=== Pane ANS2 Recuperável ===

O ANS2 (armazenamento NAND versão 2 da Apple) é o controlador da Apple para, talvez você já descobriu, o armazenamento. NAND é um tipo de memória flash usado comumente em modernos smartphones e computadores com memória soldada.

* If you get this panic, chances are the chip which houses all the data on your phone is malfunctioning or communication lines to the NAND are not functioning properly.
* Replacing the NAND requires microsoldering skills and the use of a programmer to write unique data from the old NAND chip to the new one.

=== AppleSocHot: Hot Hot Hot ===

Sometimes software developers have more fun coding in what occurs in times of error than other things because they are likely to be the only ones that see them. This error is pretty straight forward. Your CPU is not just hot—it's Hot Hot Hot.

* This specific panic refers to an electrical line between the Power Management chip and the CPU. It could in fact mean your CPU is getting too hot. It could also mean, a board level issue with this line.
* Regardless of the specifics, this is almost certainly a logic board issue, not a parts problem.
* The CPU is most likely getting hot due to some other board component. Check any areas that may have had work done. WiFi and audio related components are often the root cause.

=== SEP ROM Boot Panic ===

The Secure Enclave Processor or SEP is the part of an i[link|https://support.apple.com/guide/security/secure-enclave-sec59b0b31ff/1/web/1|Phone subsystem which handles all protected, sensitive data for an iPhone]. Things like encryption keys and fingerprint or facial identification data. The Read-only Memory or SEP ROM is an integral part of this system which verifies trust between systems.

* A SEP ROM panic indicates the ROM chip or the communication between it and the CPU is damaged.
* The data on the SEP ROM is unique so if it is damaged, it cannot be recreated. [link|https://www.youtube.com/watch?v=VdaniLIgAHo|There are readers which may allow you to pull the data off], but it can spell disaster for the phone.

=== SMC Panic Assertion Failed ===

The SMC, or System Management controller will be familiar to those who have ever done any sort of troubleshooting on a MacBook. iPhones also include an SMC, but rather than being its own chip, it is part of the CPU. These panics often make mention of the error BSC FAILURE.

* Assertion Failed type panics have begun cropping up in iPhone 13 and later models. Similar to a Watchdog Timeout, they reboot the device at the three minute mark if sensor data is not received.
* The log will generally mention an affected sensor array followed by a code. Refer to the dedicated [[iPhone SMC Panic Assertion Failed|Panic Assertion Failed wiki]] to find which code correlates to your panic.

=== Undefined Kernel Instruction ===

This kernel of an Operating System is exactly what it sounds like—the core parts. If Instructions are undefined, often this is because the instructions are damaged or not functioning properly.

* Generally this is a software issue. Check for OS updates, or even app updates.
* If updates do not resolve, you may need to reinstall or restore the operating system altogether.
* If the issue continues to occur beyond this, you’re most likely looking at an issue with system involved in RAM or the NAND storage. This is where instructions tend to be located and when those components, or their board related systems are damaged, so can the information they’re housing or transmitting.

== Additional Resources ==

* [link|https://www.ipadrehab.com/article.cfm?ArticleNumber=49|Troubleshooting Thermal Sensor Problems]
* [link|https://repair.wiki/w/How_To_Fix_an_iPhone_14_Pro_That_Randomly_Restarts|How To Fix an iPhone 14 Pro That Randomly Restarts|new_window=true]
* [link|https://www.youtube.com/watch?v=V_GEGB0lerU|Video: What Is Causing Your iPhone To Randomly Restart?]