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my iMac with 3TB fusion drive won't boot anymore. even when booting to recovery it crashes with kernel panic. the stack trace says

com.apple.driver.Corestorage dependency com.apple.iokit.IOStorageFamily

the mac also won't start from recovery mode because kernel panic occurs. I hoped I could fix the file system from the recovery mode.

As it happens my backup is not up to date so I thought I start a linux live system and try to mount the device or even fix the file system. or in the worst case just recover some files.

Fdisk tells me:

fdisk output

I have no success following this https://superuser.com/questions/961401/mounting-hfs-partition-on-arch-linux/1088110#1088110 tutorial also I have tried hfsexplorer. While I can access /dev/sda3 and /dev/sdb3 I have no success with /dev/sdb2 or /dev/sda2. it tells me that the type is unknown. also listing the partitions with gparted tells me the file system type is unknown.

I assume that the disk has no hardware issue. According to smartctl I get: enter image description here

so how can I go on from here? Is it safe to say the file system is broke? Can I fix it? can I somehow mount this Apple Core Storage system?

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    If your macOS installation is at all up to date, it's increasingly likely that the volume(s) you can't mount are not HFS, but APFS. A quick Google search seems to indicate that can be mounted too on Linux, but I have no experience with that. – Siguza Apr 28 '18 at 17:59
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    according to this discussion: askubuntu.com/questions/991695/… it will be difficult. However this tutorial az4n6.blogspot.de/2018/01/mounting-apfs-image-in-linux.html I have successfully installed apfs-fuse but I can't mount the device not with the method from the tutorial and not directly. I always get the error "Unable to get Volume" if using the loop method from the tutorial I also some nids which where not found. I will continue to try and keep u updated – Rene Pickhardt Apr 28 '18 at 18:41
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    just added an issue to apfs-fuse c.f.: github.com/sgan81/apfs-fuse/issues/27 – Rene Pickhardt Apr 28 '18 at 18:58

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