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Very strange Kernel Panic on my hackintosh 


I begins with an application with colored beachball.

internal hard drive activity LED : ON 

Then Freeze 




after reboot : my internal Samsung SSD EVO 250 Go is not booted  but another disk.

IF I do a full on/off , the PC is booting with this SSD as configured in the bios, and MacOS warns me of the kernel panic.



panic(cpu 4 caller 0xffffff80199f99b8): watchdog timeout: no checkins from watchdogd in 98 seconds (207 total checkins since monitoring last enabled)

Backtrace (CPU 4), Frame : Return Address

0xffffffa07f3c3c00 : 0xffffff801668e0dd

0xffffffa07f3c3c50 : 0xffffff80167d4f33

0xffffffa07f3c3c90 : 0xffffff80167c552a

0xffffffa07f3c3ce0 : 0xffffff8016632a2f

0xffffffa07f3c3d00 : 0xffffff801668d8fd

0xffffffa07f3c3e20 : 0xffffff801668dbf3

0xffffffa07f3c3e90 : 0xffffff8016e9d884

0xffffffa07f3c3f00 : 0xffffff80199f99b8

0xffffffa07f3c3f20 : 0xffffff80199f92e1

0xffffffa07f3c3f50 : 0xffffff8017d6565f

0xffffffa07f3c3fa0 : 0xffffff801663213e

      Kernel Extensions in backtrace:



            dependency: com.apple.driver.watchdog(1)[C29AFC04-7113-39AA-80DF-00F4DDAD0F46]@0xffffff80199f7000->0xffffff80199f9fff

            dependency: com.apple.iokit.IOACPIFamily(1.4)[1B2FE91E-3EC7-3ED3-AF6B-E9C4BE29D5E3]@0xffffff8018c42000->0xffffff8018c43fff

            dependency: com.apple.iokit.IOPCIFamily(2.9)[99A70889-A31C-3B25-8E88-ADD3F317E4E4]@0xffffff801916a000->0xffffff8019192fff


Process name corresponding to current thread: kernel_task

Boot args: alcid=1 chunklist-security-epoch=0 -chunklist-no-rev2-dev


Mac OS version:



Kernel version:

Darwin Kernel Version 20.5.0: Sat May  8 05:10:33 PDT 2021; root:xnu-7195.121.3~9/RELEASE_X86_64

Kernel UUID: 52A1E876-863E-38E3-AC80-09BBAB13B752

KernelCache slide: 0x0000000016400000

KernelCache base:  0xffffff8016600000

Kernel slide:      0x0000000016410000

Kernel text base:  0xffffff8016610000

__HIB  text base: 0xffffff8016500000

System model name: iMac15,1 (Mac-42FD25EABCABB274)

System shutdown begun: NO

Panic diags file available: YES (0x0)

Hibernation exit count: 0


System uptime in nanoseconds: 2150792980004

Last Sleep:           absolute           base_tsc          base_nano

  Uptime  : 0x000001f4c5406971

  Sleep   : 0x0000000000000000 0x0000000000000000 0x0000000000000000

  Wake    : 0x0000000000000000 0x0000001a784391fe 0x0000000000000000

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