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

Symptoms

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.

Changes

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.

Cause

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