kernel panic

[dmanske]

hello my friend, new kernel panic in tahoe b7
thanks

[jzrodriguez98]

Consider uploading the log to allow the dev seeing the kernel panic and diagnose.

[naidb]

Hello my friend, there's a new kernel panic in Tahoe B2-B7.
I didn't know the cause until today when I found out it was caused by AppleIGC.kext, which is what caused the unexplained panic.
thanks

2025-08-21-040101.kernel.core.log

[SongXiaoXi]

Hi @naidb, thanks for uploading the panic log.
Based on the trace in 2025-08-21-040101.kernel.core.log, I’ve prepared a test build that should address the AppleIGC.kext crash. Could you please install it and let me know if the kernel panic still occurs? If this panic is common for you, your feedback will help confirm the fix.
Thanks!

AppleIGC.kext.zip

[naidb]

Hello, my friend. The problem persists. Clover might take a while.
But Opencore restarted earlier than my friend. What should I do?
Thank you.

panic.odt

2025-08-21-145655.kernel.core.log

2025-08-21-161802.kernel.core.log

[SongXiaoXi]

Hi @naidb, thanks again for testing and for your feedback!

I tracked the panic down to another insufficient boundary checks when walking IPv6 extension headers—this could cause us to read past the end of the packet.
Could you please install another test build below?

AppleIGC.kext.zip

[naidb]

Hello, dear friends.
It seems that this version no longer experiences unexplained restarts.
I'll try to use it heavily for a while. I'll open two 8K web browsers for extended periods of time to see if the issue persists. If it does, I'll let you know.
Thank you, dear friends.

[dmanske]

Hello,

I am currently testing macOS Tahoe Beta 7 (build 25A5346a) on my system, and I’m experiencing a kernel panic right after the system starts loading into macOS.

I already uploaded and tested the latest kext you provided above for the Intel I226-V, but unfortunately the issue persists.

Below is the panic log:

panic(cpu 0 caller 0xffffff8000b9393c): assertion failed: m->m_flags & M_PKTHDR,
file: /AppleInternal/Library/BuildRoots/.../uipc_mbuf.c, line: 4839 @uipc_socket.c:8229
Panicked task 0xffffff9df348a620: 342 threads: pid 0: kernel_task
Backtrace (CPU 0), panicked thread: 0xffffff9df43120c8, Frame : Return Address
0xffffffd91c47fab0 : 0xffffff80003574e1 mach_kernel : _handle_debugger_trap + 0x431
0xffffffd91c47fb00 : 0xffffff80004d29b6 mach_kernel : _kdp_i386_trap + 0x126
0xffffffd91c47fb40 : 0xffffff80004c1bbc mach_kernel : _kernel_trap + 0x75c
0xffffffd91c47fc00 : 0xffffff80002eb971 mach_kernel : _return_from_trap + 0xc1
0xffffffd91c47fc20 : 0xffffff80003578b7 mach_kernel : _DebuggerTrapWithState + 0x67
0xffffffd91c47fd20 : 0xffffff8000356f36 mach_kernel : _panic_trap_to_debugger + 0x206
0xffffffd91c47fd90 : 0xffffff8000b88c3d mach_kernel : _panic + 0x81
0xffffffd91c47fe80 : 0xffffff8000b9393c mach_kernel : _panic_machine_check64 + 0xc78
0xffffffd91c47fe90 : 0xffffff80005dc389 mach_kernel : _dlil_create_input_thread + 0x2179
0xffffffd91c47ff50 : 0xffffff80005dc646 mach_kernel : _dlil_create_input_thread + 0x2436
0xffffffd91c47ffa0 : 0xffffff80002eb19e mach_kernel : _call_continuation + 0x2e

System Info:

Type: Desktop

Motherboard: Asus ROG Strix Z790-E Gaming WiFi

CPU: Intel Core i7-14700K

GPU: AMD Radeon RX 6600 (8176 MB)

NVMe: Samsung 980 PRO with Heatsink 1TB (PCI-E 4.0 x4)

Ethernet: Intel Ethernet Controller I226-V

SMBIOS: MacPro7,1

Boot Args: agdpmod=pikera

The panic seems to be related to the network stack (DLIL / mbuf handling), and it happens consistently at startup, preventing macOS from booting.

Could you please check if this is a regression with Tahoe Beta 7, or if a newer patch will be required for the Intel I226-V driver?

Thank you.

[dmanske]

Additional Note:
If I remove the Ethernet cable and also disable/remove the kext, the system boots and works normally. The panic only happens when the I226-V driver is active with the network connected.

[SongXiaoXi]

Hi @dmanske,

Thanks for sharing the backtrace. From the information in your log, I can’t determine the exact root cause with certainty. However, since the panic is triggered by the M_PKTHDR assertion, I’ve added extra validation and drop logic in the RX path.

Because Ethernet is inherently unreliable and upper layers will retransmit, dropping these problematic packets should not significantly affect throughput or stability. Hopefully, this change will help mitigate the issue you’re seeing.

Could you please test the updated build and let me know if the panic still occurs?

Thanks again for your help and detailed feedback!

AppleIGC.kext.zip

[dmanske]

Hi,

I already tested the fix you sent earlier, but I got error again.
I’m attaching the crash log file so you can analyze it and check what might be causing the issue.

Thanks in advance for your support.

Best regards,
Daniel

Kernel-2025-08-22-110247.panic.zip

[SongXiaoXi]

Hello @dmanske, could you please provide the macOS Tahoe Beta 7 kernelcache?
It’s usually located at a path similar to:

/System/Volumes/Preboot/E9544F41-7576-4A5D-8FCE-E08CA48377F3/boot/8D82741F50373E33222FA35386D1E7B84C9CBA6046AE4B220F0826E82B03D447174E923B21AAA93656FF4C167B84CB2B/System/Library/Caches/com.apple.kernelcaches/kernelcache

Thanks!

[dmanske]

BootKernelExtensions.kc.zip

I guess it is, its was a diferent folder
please remove .zip

Thanks!

[dmanske]

Hi SongXiaoXi

I entered macOS Tahoe to collect the kernel panic you requested. At first, I disconnected the Ethernet cable so I could navigate and capture the panic log. After some time, I retrieved the file and then reconnected the cable to see if the system would crash again.

To my surprise, it did not crash. I am currently running Tahoe with internet access, using the kext you provided above. I was even able to compress and upload everything through Safari in Tahoe without issues.

Now, I will restart the machine and boot directly with the Ethernet cable connected, to see if the system crashes on startup. I’ll report back with the result. On previous attempts, the system would crash within 10 seconds whenever it booted with the cable plugged in.

Best regards,
Daniel

[dmanske]

Just to give you an update: I tried rebooting with the Ethernet cable connected, and in this case the system practically starts already frozen — I can’t do anything at all.

Then I removed the cable, rebooted, waited about one minute, and plugged the cable back in. With that approach, the system is running fine and I can normally browse the internet on Tahoe.

I’m not sure if this information is helpful for your analysis, but I wanted to share it in case it provides any clue.

Best regards,
Daniel

[dmanske]

panic(cpu 19 caller 0xffffff8000b9393c): assertion failed: m->m_flags & M_PKTHDR, file: /AppleInternal/Library/BuildRoots/4~B7kvugD-3BmZw5Uo5hCwoMCv25L4e5YZ3jnjSj0/Library/Caches/com.apple.xbs/Sources/xnu/bsd/kern/uipc_mbuf.c, line: 4839 @uipc_socket.c:8229
Panicked task 0xffffff90461b2d38: 342 threads: pid 0: kernel_task
Backtrace (CPU 19), panicked thread: 0xffffff90459c1598, Frame : Return Address
0xfffffff05e9f3ab0 : 0xffffff80003574e1 mach_kernel : _handle_debugger_trap + 0x431
0xfffffff05e9f3b00 : 0xffffff80004d29b6 mach_kernel : _kdp_i386_trap + 0x126
0xfffffff05e9f3b40 : 0xffffff80004c1bbc mach_kernel : _kernel_trap + 0x75c
0xfffffff05e9f3c00 : 0xffffff80002eb971 mach_kernel : _return_from_trap + 0xc1
0xfffffff05e9f3c20 : 0xffffff80003578b7 mach_kernel : _DebuggerTrapWithState + 0x67
0xfffffff05e9f3d20 : 0xffffff8000356f36 mach_kernel : _panic_trap_to_debugger + 0x206
0xfffffff05e9f3d90 : 0xffffff8000b88c3d mach_kernel : _panic + 0x81
0xfffffff05e9f3e80 : 0xffffff8000b9393c mach_kernel : _panic_machine_check64 + 0xc78
0xfffffff05e9f3e90 : 0xffffff80005dc389 mach_kernel : _dlil_create_input_thread + 0x2179
0xfffffff05e9f3f50 : 0xffffff80005dc646 mach_kernel : _dlil_create_input_thread + 0x2436
0xfffffff05e9f3fa0 : 0xffffff80002eb19e mach_kernel : _call_continuation + 0x2e

Process name corresponding to current thread (0xffffff90459c1598): kernel_task
Boot args: keepsyms=1 debug=0x100 agdpmod=pikera -wegnoigpu

Mac OS version:
25A5346a

Kernel version:
Darwin Kernel Version 25.0.0: Thu Aug 14 22:02:20 PDT 2025; root:xnu-12377.1.8~5/RELEASE_X86_64
Kernel UUID: 8A373D24-E11A-31BD-B00C-6F47C9AF8A81
roots installed: 0
KernelCache slide: 0x0000000000000000
KernelCache base: 0xffffff8000200000
Kernel slide: 0x00000000000e8000
Kernel text base: 0xffffff80002e8000
__HIB text base: 0xffffff8000100000
System model name: MacPro7,1 (Mac-27AD2F918AE68F61)
System shutdown begun: NO
Panic diags file available: YES (0x0)
Hibernation exit count: 0

System uptime in nanoseconds: 312242623629
Last Sleep: absolute base_tsc base_nano
Uptime : 0x00000048b31c5971
Sleep : 0x0000000000000000 0x0000000000000000 0x0000000000000000
Wake : 0x0000000000000000 0x00000013ec6a5cc3 0x0000000000000000
Compressor Info: 0% of compressed pages limit (OK) and 0% of segments limit (OK) with 0 swapfiles and OK swap space
Zone info:
Zone map: 0xffffff8046162000 - 0xffffffa046162000
. VM : 0xffffff8046162000 - 0xffffff8512e2e000
. RO : 0xffffff8512e2e000 - 0xffffff86ac7d2000
. GEN0 : 0xffffff86ac7d2000 - 0xffffff8b7949e000
. GEN1 : 0xffffff8b7949e000 - 0xffffff904616a000
. GEN2 : 0xffffff904616a000 - 0xffffff9512e36000
. GEN3 : 0xffffff9512e36000 - 0xffffff99dfb02000
. DATA : 0xffffff99dfb02000 - 0xffffffa046162000
Metadata: 0xffffffc06adb2000 - 0xffffffc08adb2000
Bitmaps : 0xffffffc08adb2000 - 0xffffffc096db2000
Extra : 0 - 0