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I'm currently having a issue with iMac 18,3. It kernel panics and won't boot - Instead, it shows:

panic(cpu 8 caller 0xffffff881e76a6ef): initproc exited -- exit reason namespace 6 subcode 8x9 description: dyld shared cache mapping not covered by code signature

uuid info:
 0x18ce88888uuid = <33db4e37-bc29-37a4-92ab-30328e66a8fa>
 0x183aa7700uuid = <15c46340-04e8-3e39-82a6-6354728d4720>

Thread 8 crashed

RAX: 0x0000000002888289, RBX: 0x0000000000000009, RCX: 0x00007fff5c157818, RDX: 0x00007fff5c157498
RSP: 0x00007fff5c157818, RBP: 0x00007fff5c157878, RSI: 0x0000000000000009, RDI: 0x0000000000000006
R8:  0x00007fff5c157898, R9:  0x0000000000000000, R10: 0x0000000000000014, R11:0x0000000000000246
R12: 0x0000000000000014, R13: 0x00007fff5c157498, R14: 0x0000000000000006, R15: 0x0000000000000000
RFL: 0x0000000000000246, RIP: 0x000000018ceb19ee, CS:  0x0000000000000007, SS: 0x0000000000000023

Thread 0: 0xffffff006d66f780
0x000000010ceb19ee
0x000000010ceb1464
0x000000010ce8c793
0x000000010ce8eb8f
0x000000010ce89249
0x000000010ce89036
0x0000000000000001


Mac OS version:
Not yet set

Kernel version:
Darwin Kernel Version 16.7.0: Sun Jun 2 20:26:31 PDT 2019; root:xnu-3789.73.50~1/RELEASE_X86_64
Kernel UUID: 97700CB3-2647-3AE4-A7F2-BA2F41FA8791
System model name: iMac18,3 (Mac-BE000AF8C5EB4FA2)

I've wrote this with my hands so there may be a typo.

Any ideas? I've tried:

  • Resetting NVRAM, SMC
  • Apple Diagnostics (which gives no error)
  • Safe boot (which doesn't boot)
  • Disk first aid via mac recovery mode's disk utility (which gives no error)

Note: There's no third-party external drive or peripherals, it just has Magic mouse/Magic keyboard.

I'm highly suspecting it's caused by hardware (even though Apple Diagnostics said no issue were found), but I wanted to make sure if it's hardware issue or software issue. Problem is, this iMac isn't actually mine, but my colleague's. I told him numerous times to take a backup, but he didn't listen - So, we need data.

Any help would be appreciated.

Edit:

-bash-3.2# diskutil list internal
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *28.0 GB    disk0
   1:                        EFI ⁨EFI⁩                     314.6 MB   disk0s1
   2:          Apple_CoreStorage ⁨Macintosh Hd⁩            27.6 GB    disk0s2
   3:                 Apple_Boot ⁨Boot OS X⁩               134.2 MB   disk0s3

/dev/disk2 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk2
   1:                        EFI ⁨EFI⁩                     209.7 MB   disk2s1
   2:          Apple_CoreStorage ⁨Macintosh Hd⁩            999.3 GB   disk2s2
   3:                 Apple_Boot ⁨Recovery HD⁩             650.0 MB   disk2s3

/dev/disk3 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS ⁨Macintosh⁩               +1.0 TB     disk3
                                 Logical Volume on disk2s2, disk0s2
                                 96B85A8B-276E-4D44-863D-AE38C6EF52D6
                                 Unencrypted Fusion Drive

-bash-3.2# diskutil cs list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 05E55E82-9EC2-431D-9A4D-82121C76C853
    =========================================================
    Name:         Macintosh Hd
    Status:       Online
    Size:         1026896293888 B (1.0 TB)
    Free Space:   20480 B (20.5 KB)
    |
    +-< Physical Volume 3BCD9C9A-F0BD-4DCF-8019-6F471D0853C5
    |   ----------------------------------------------------
    |   Index:    0
    |   Disk:     disk2s2
    |   Status:   Online
    |   Size:     999345127424 B (999.3 GB)
    |
    +-< Physical Volume 14901EE2-0537-462C-928B-02968D6AEC66
    |   ----------------------------------------------------
    |   Index:    1
    |   Disk:     disk0s2
    |   Status:   Online
    |   Size:     27551166464 B (27.6 GB)
    |
    +-> Logical Volume Family 280233FF-FD5A-4D93-8C5E-F209E37001E9
        ----------------------------------------------------------
        Encryption Type:         None
        |
        +-> Logical Volume 96B85A8B-276E-4D44-863D-AE38C6EF52D6
            ---------------------------------------------------
            Disk:                  disk3
            Status:                Online
            Size (Total):          1025980628992 B (1.0 TB)
            Revertible:            No
            LV Name:               Macintosh
            Volume Name:           Macintosh
            Content Hint:          Apple_HFS
            LVG Type:              Fusion, Sparse

-bash-3.2# diskutil cs info disk3
Core Storage Properties:
   Role:                       Logical Volume (LV)
   UUID:                       96B85A8B-276E-4D44-863D-AE38C6EF52D6
   Parent LVF UUID:            280233FF-FD5A-4D93-8C5E-F209E37001E9
   Parent LVG UUID:            05E55E82-9EC2-431D-9A4D-82121C76C853
   Device Identifier:          disk3
   LV Status:                  Online
   Conversion State:           NoConversion
   LV Conversion Progress:     100%
   Content Hint:               Apple_HFS
   LV Name:                    Macintosh
   Volume Name:                Macintosh
   LV Size:                    1025980628992 B
Improve this question
8
  • Have you try boot in Internet Recovery Mode (cmd+alt+r at boot)? If yes, can you from the terminal in Recovery mode (Top menu/Utilities/Terminal), give the results of the command diskutil list internal. To add this informations at your question you can open a second terminal (cmd+n) and run the command /Applications/Safari.app/Contents/MacOS/safarithat open Safari to acces the forum.
    – user415185
    Commented Sep 29, 2021 at 5:32
  • @Jean_JD I added information in my post.
    – Skye-AT
    Commented Sep 29, 2021 at 5:59
  • Perfect. Can you add now the result of diskutil cs list and do you know what is the actual System Version?
    – user415185
    Commented Sep 29, 2021 at 6:15
  • @Jean_JD I've added info, and I think it was High Sierra 10.13.5 or 6.
    – Skye-AT
    Commented Sep 29, 2021 at 6:22
  • What do you want do? Save data to an external disk (formated HFS+ with a Partition scheme GUID) and try boot on this external disk or reinstall the system? Normally the second operation is risk-free if you have a backup. But personally I recommend doing a backup first.
    – user415185
    Commented Sep 29, 2021 at 6:28

2 Answers 2

Reset to default
0

So, during the conversation with Jean_JD, I've replaced iMac 18,3 with Mac mini 9,1.

Cloned the iMac 18,3's HDD to external drive with terminal command (Luckily, I could boot into Recovery mode) cp -rv %source directory% %target directry% (-v(verbose) isn't normally needed I think), and extracted important files to Mac mini... and it's done.

So, now's the iMac: Luckily, the issue wasn't on hardware. Since I've already extracted data, I've just clean installed MacOS to see if I can use it - yes, it worked. Now I've updated to latest version(Big Sur 11.6), and it's working fine.

Not sure what's caused the issue though, maybe the systems got corrupted somehow.
Anyway, big thanks to @Jean_JD .

Improve this answer
1
  • Happy for you ;-)
    – user415185
    Commented Sep 30, 2021 at 4:09
-2

May be removed and cleaned the RAM

Improve this answer
1
  • Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.
    – Community Bot
    Commented Sep 29, 2021 at 14:56

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