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freeing free inode/frag/block Panic on / After Issuing the lufslist Command (Doc ID 1329401.1)

Last updated on FEBRUARY 03, 2022

Applies to:

Solaris Operating System - Version 8 to 10 1/13 U11 [Release 8.0 to 10.0]
Information in this document applies to any platform.


You may see a panic with the panic string similar to this.

Jun  7 13:11:52 host ^Mpanic[cpu13]/thread=30007f66720:
Jun  7 13:11:52 host unix: [ID 198239 kern.notice] free: freeing free block, dev:0x2000000008, block:39392, ino:2, fs:/.alt.tmp.b-wB.mnt

This means UFS freeing free block panic happened on "/.alt.tmp.b-wB.mnt".

The scope of this document is to explain and prevent future similar freeing free panics, when the affected file system name starts with "/.alt.tmp".  "/.alt.tmp" means the filesystem is a boot environment of Live Upgrade.

It does not explain any other ufs related panic, when the file system name does not match the above pattern.


Sometimes before the panic, a live upgrade was performed by :

  • One side of the boot disk mirror was detached.
  • The detached disk was used to host the new boot environment for the live upgrade.
  • The new boot environment was upgraded and activated.
  • The new boot environment was re-mirrored with the other side of the original mirror without deleting the old boot environment using ludelete.


The proper way is to delete the old boot environment using ludelete before the device is re-mirrored.



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