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Released September 20, Apple's largest and most expensive 2019 smartphone features a 6.5" OLED display, a triple-lens camera system, and greatly improved battery life. Successor to the iPhone XS Max.

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i2c3::_checkBusStatus SCL is stuck low; last write status 00010110

bug_type":"210","timestamp":"2024-04-02 09:22:11.00 +0200","os_version":"iPhone OS 17.4.1 (21E236)","roots_installed":0,"incident_id":"23B2C304-02B2-4433-AA84-2E2B7CB4AAFE"}

{

"build" : "iPhone OS 17.4.1 (21E236)",

"product" : "iPhone12,5",

"socId" : "8030",

"socRevision" : "11",

"incident" : "23B2C304-02B2-4433-AA84-2E2B7CB4AAFE",

"crashReporterKey" : "425ad00ac43617f1bcc5c6dc967243b2948053cd",

"kernel" : "Darwin Kernel Version 23.4.0: Fri Mar 8 23:26:31 PST 2024; root:xnu-10063.102.14~67\/RELEASE_ARM64_T8030",

"date" : "2024-04-02 09:22:11.21 +0200",

"panicString" : "panic(cpu 3 caller 0xfffffff0261f0d24): \"i2c3::_checkBusStatus SCL is stuck low; last write status 00010110 int shadow 01090100 xfer 00000000 fifo 00000000 for device roswell\" @AppleS5L8940XI2C.cpp:470\nDebugger message: panic\nMemory ID: 0x1\nOS release type: User\nOS version: 21E236\nKernel version: Darwin Kernel Version 23.4.0: Fri Mar 8 23:26:31 PST 2024; root:xnu-10063.102.14~67\/RELEASE_ARM64_T8030\nFileset Kernelcache UUID: B603FBC2B014FFD42F13F9D47BF3EED9\nKernel UUID: B8517801-F3D0-341C-AF4B-80D5D3825EBA\nBoot session UUID: 23B2C304-02B2-4433-AA84-2E2B7CB4AAFE\niBoot version: iBoot-10151.102.2\nsecure boot?: YES\nroots installed: 0\nPaniclog version: 14\nKernelCache slide: 0x000000001d134000\nKernelCache base: 0xfffffff024138000\nKernel slide: 0x000000001d13c000\nKernel text base: 0xfffffff024140000\nKernel text exec slide: 0x000000001de70000\nKernel text exec base: 0xfffffff024e74000\nmach_absolute_time: 0x34b2b0b1\nEpoch Time: sec usec\n Boot : 0x660bb1c4 0x00007c74\n Sleep : 0x00000000 0x00000000\n Wake : 0x00000000 0x00000000\n Calendar: 0x660bb1de 0x000c5661\n\nZone info:\n Zone map: 0xffffffdc08614000 - 0xffffffe208614000\n . VM : 0xffffffdc08614000 - 0xffffffdceec78000\n . RO : 0xffffffdceec78000 - 0xffffffdd3b944000\n . GEN0 : 0xffffffdd3b944000 - 0xffffffde21fa8000\n . GEN1 : 0xffffffde21fa8000 - 0xffffffdf0860c000\n . GEN2 : 0xffffffdf0860c000 - 0xffffffdfeec74000\n . GEN3 : 0xffffffdfeec74000 - 0xffffffe0d52dc000\n . DATA : 0xffffffe0d52dc000 - 0xffffffe208614000\n Metadata: 0xffffffdc00354000 - 0xffffffdc01b54000\n Bitmaps : 0xffffffdc01b54000 - 0xffffffdc02604000\n Extra : 0 - 0\n\nCORE 0 recently retired instr at 0xfffffff024ffe1d4\nCORE 1 recently retired instr at 0xfffffff024ffe1d4\nCORE 2 recently retired instr at 0xfffffff024ffe1d4\nCORE 3 recently retired instr at 0xfffffff024ffcc74\nCORE 4 recently retired instr at 0xfffffff024ffe1d4\nCORE 5 recently retired instr at 0xfffffff024ffe1d4\nTPIDRx_ELy = {1: 0xffffffdf0470d780 0: 0x0000000000000003 0ro: 0x0000000000000000 }\nCORE 0: PC=0x00000001027d3404, LR=0x00000001027d3400, FP=0x000000016da85c20\nCORE 1: PC=0x00000001a262eee4, LR=0x0000000100afdbb0, FP=0x000000016f39e1b0\nCORE 2: PC=0x000000019a564214, LR=0x000000019a56506c, FP=0x000000016b8b6240\nCORE 3 is the one that panicked. Check the full

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Okay, luckily enough I happen to have schematics for the 11 Pro Max, or we'd be out of luck figuring this one out.

Alisha (@flannelist), can you double check my reasoning and logic here?

All right, the I2C bus labelled I2C3 goes to three connectors on the board; the FCAM connector J7600, the Tele Camera Connector J7300, and the Touch Connector, J8100. The I/O address table for J8100 lists two addresses used for something called "Roswell", and the "Touch EEPROM". J8100 is specifically shown as going to the digitizer on the screen in the screen replacement guide.

Given that your panic log explicitly mentions Roswell:

i2c3::_checkBusStatus SCL is stuck low; last write status 00010110 int shadow 01090100 xfer 00000000 fifo 00000000 for device roswell

I would say it's a pretty good bet the problem is being caused by a bad screen; specifically the digitizer on it. Of course, you haven't given us any other information about this error such as, did it start as a result of being dropped or some other damage to the phone?

In the absence of any other knowledge, I'd say you're probably in the market for a new screen. That would be what I would do if it was my phone.

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On the nose. I just saw this same panic in a group the other day actually. But yes, Roswell (likely the touch controller, Apple loves a code name) and the touch eeprom are both on the cable on the back of the display. So New screen would be my first guess.

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