User profile for user: calawrence
calawrence Author
User level: Level 1
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Kernel Panic - ANS2 Recoverable Panic - assert failed: [15468]:Double Bitflip in region 1

Am diagnosing a Mac that is repeatedly getting kernel panics


After a fresh install of macOS Sequoia, the issue has returned with the following report:


-=-=-=-=-


anic(cpu 1 caller 0xfffffe001ce720ec): ANS2 Recoverable Panic - assert failed: [15468]:Double Bitflip in region 1, err 0x80, addr 0x107ff22cd40 - PreNand(10)


assert failed: [15468]:Double Bitflip in region 1, err 0x80, addr 0x107ff22cd40


RTKit: RTKit-2758.60.101.release - Client: t6020.release-AppleStorageFirmwarePreASP3-499.0.9~3448~499.0.9~3448


!UUID: 5875616f-2644-3783-9ee5-6e62e2de7c94


ASLR slide: 0x0000000000000000


Time: 0x00000184d9fd15cf


Faulting task  10 Call Stack: 0x000000000001b2f8 0x000000000001ac64 0x000000000001aa7c 0x000000000001d084 0x000000000001e854 0x000000000001e888 0x0000000000036320 0x0000000000036780 0x000000000003525c 0x0000000000013190 0x000000000000b45c 0x0000000000008614 0x000000000000ed88 0x000000000000ed80 0x000000000000fbcc 0x0000000000199f24 0x000000000005cbec


Chinook ASC Async error info: 


l2c_err_sts 0x5000fbfc00000000, l2c_err_adr 000000000000000000, l2c_err_inf 000000000000000000


lsu_err_sts 000000000000000000, fed_err_sts 000000000000000000, mmu_err_sts 000000000000000000


dpc_err_sts 000000000000000000


Mailbox (0): (0)


  Inbox  AKF_KIC_INBOX_CTRL = 0x00020001, AKF_KIC_MAILBOX_SET = 0x11111101


  Outbox AKF_AP_OUTBOX_CTRL = 0x00026601, AKF_AP_MAILBOX_SET  = 0x00000000


-=-=-=-=-


There full report is many pages long, this is the first part. Can provide more if needed.


This reports was generated after a clean install of macOS Sequoia.


MacBook Pro (16-inch, 2021). M1 Pro, 16 GB RAM


Any assistance would be appreciated, thank you!



MacBook Pro (2021)

Posted on Dec 20, 2024 11:25 AM

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User profile for user: HWTech
HWTech
User level: Level 9
69,194 points

Posted on Dec 20, 2024 2:31 PM

calawrence wrote:

anic(cpu 1 caller 0xfffffe001ce720ec): ANS2 Recoverable Panic - assert failed: [15468]:Double Bitflip in region 1, err 0x80, addr 0x107ff22cd40 - PreNand(10)

assert failed: [15468]:Double Bitflip in region 1, err 0x80, addr 0x107ff22cd40

This is a problem with an SSD. Most likely the internal SSD, but could possibly be an external Thunderbolt SSD (not USB) since I have seen a few Kernel Panics on this forum where the external NVMe Thunderbolt SSD will cause the problem and "appear" as an internal drive.


ANS2 == Apple NAND Storage 2 which means SSD


And a Bitflip is just as it sounds, one of the bits has changed its value. You had a Double Bitflip.


This is most likely a hardware issue of some sort, most likely with the Logic Board, unless you find an external Thunderbolt SSD is causing it.


You can try running the Apple Diagnostics to see if any hardware issues are detected. Only a failing diagnostic is useful to confirm a hardware problem, but the diagnostics rarely detect issues. If you are still getting this Kernel Panic with a clean install, then you have confirmed a hardware problem assuming you did not restore from a backup & did not install any third party software, and had no externally connected devices. You will need to have Apple or an Apple Authorized Service Provider examine the laptop to provide you with a repair estimate.


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User profile for user: HWTech
HWTech
User level: Level 9
69,194 points

Dec 20, 2024 2:31 PM in response to calawrence

calawrence wrote:

anic(cpu 1 caller 0xfffffe001ce720ec): ANS2 Recoverable Panic - assert failed: [15468]:Double Bitflip in region 1, err 0x80, addr 0x107ff22cd40 - PreNand(10)

assert failed: [15468]:Double Bitflip in region 1, err 0x80, addr 0x107ff22cd40

This is a problem with an SSD. Most likely the internal SSD, but could possibly be an external Thunderbolt SSD (not USB) since I have seen a few Kernel Panics on this forum where the external NVMe Thunderbolt SSD will cause the problem and "appear" as an internal drive.


ANS2 == Apple NAND Storage 2 which means SSD


And a Bitflip is just as it sounds, one of the bits has changed its value. You had a Double Bitflip.


This is most likely a hardware issue of some sort, most likely with the Logic Board, unless you find an external Thunderbolt SSD is causing it.


You can try running the Apple Diagnostics to see if any hardware issues are detected. Only a failing diagnostic is useful to confirm a hardware problem, but the diagnostics rarely detect issues. If you are still getting this Kernel Panic with a clean install, then you have confirmed a hardware problem assuming you did not restore from a backup & did not install any third party software, and had no externally connected devices. You will need to have Apple or an Apple Authorized Service Provider examine the laptop to provide you with a repair estimate.


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Kernel Panic - ANS2 Recoverable Panic - assert failed: [15468]:Double Bitflip in region 1

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