Case Study: When iPhone Restarts Randomly
If you got an iPhone booting up normally, but restarts say every 3 minutes, how do you debug it?
First, go check the panic report in
Settings -> Privacy -> Analytics & Improvements -> Analytics Data -> panic-full-(date).ips,
Then, open the report and read the "panicString".
Example 1:
In the image above, it's an "userspace watchdog timeout" error, and "missing sensor Mic2". Refer to table provided on the left, you can find the cause is possibly microphone fault, so at the right column it tells which parts to replace to solve this issue.
It could be charging port, power flex, or battery being faulty, change them and if issue resolved.
Example 2:
This one has a panicString of "AOP PANIC - K2 BOSCH CONTROL".
Refer the the table, you can see it's likely caused by faulty vibrator.
Replace the vibrator and test if the issue has been resolved.
| Panic String | Check Components |
|---|---|
| AOP PANIC k2- bosch control | VIBRATOR |
| Apple BCMWLAN | WIFI , BLUETOOTH |
| AOP DATA ABORT | CPU CONNECTION |
| Failed to stop GFX FW for GPU recovery | GPU , INDUCTOR , CPU DRY JOINT |
| AppleSocHot;Hot | Short Circuit Power Failure : CPU : motherboard |
| Attempting to forcibly halt CPU…cpu0 fail to halt | Short Circuit Power Failure : CPU : INDUCTOR |
| Anc-postnand.c1260vasser falled lind, ANS | NAND : MOTHERBOARD |
| Apple tristar2:could not find | Charging Flex , Tristar |
| Fimware fatal | IOS : MOTHERBOARD |
| eMemory apcie, apcie[0:s3e] | NAND : NAND PCIE LINE : CPU DRY JOINT |
| I2C0, I2C1, I2C2, I2C3 | I2c line |
| Radio on gated:baseband radio on sequence falled | Baseband |
| AOP PANIC - no pulse on | MIC : Check all audio related parts |
| SEP ROM boot panic | eeprom |
| Stacks+routined-date | For ipad long screw damage |
| AOP PANIC-......prox | Proximity Sensor |
| PMP NMI FIQ | CPU : PM IC |
| PC alignment exception from kernel | CPU : GPU |
| Kernel data abort | Fast charge ic , Cpu related data line |
| AGXG10P_B0 NMI | Motherboard ( mostly on iphone 8 ,8p X) |
| LLC, L2C | 24m Clock , CPU to GPU connection |
| nvme | NAND |
| Invalid kernel stack pointer(probable corruption) | CPU , GPU |
| SMC PREFETCH ABORT | Battery : Nand |
| Invalid mutex | Nand Data Corrupted |
| MBI queue | 6SP LCD |
| AppleHydra | Charging Flex |
| LSU error(Apple Fabric) on E-core | CPU ECORE Inductor |
| Sequencer Timeout | Audio IC |
| CS42L75 Audio | Audio IC |
| CS35L25Amp arc | ARC Audio |
| Spinlock timeout after ** ticks | IOS : NAND |
| Userspace watchdog timeout ( MIC 1 , MIC 2 , Prs0 , TG08 ) | BATTERY : CHARGING PORT : POWER FLEX |
| apcie[baseband] | BASEBAND |
| AppleMesaSEPDriver | FINGERPRINT SENSOR |
| apcie[wlan] | WIFI IC |
| GFX NMI | GPU : INDUCTOR : CPU DRY JOINT |
| AMCC error | CPU DRY JOINT |
| Accelerator | ACCELERATOR IC , NAND DATA |
| AppleBaseland | BASEBAND |
| FED err(...) on P-core | CPU P CORE INDUCTOR |
| No response to AP power notification in xxs | CPU INDUCTOR |
| AppleMaggieArcAudio | ARC AUDIO IC |