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How to Fix Solaris Panics Caused by "freeing free", "ufs_putapage: bn == UFS_HOLE", or "alloccgblk: can't find blk in cyl, pos" (Doc ID 1017680.1)

Last updated on JANUARY 29, 2022

Applies to:

Solaris Operating System - Version 8.0 and later
All Platforms Document is still relevant and appropriate, as UFS is still in use and ufs corruptions do happen.


File system corruption can lead to system panics with the following types of panic strings:

  freeing free frag
  freeing free inode
  freeing free block
  ufs_putapage: bn == UFS_HOLE
  alloccgblk: can't find blk in cyl, pos

These panic strings indicate that the system was trying to put a fragment, inode or block onto the free list but found that it was already there.  The correct response for Solaris is to stop operating with the bad data by panicking the system. 

NOTE:  The default response of panicking the system can be disabled.  See the
following document for alternative responses:

Document 1009218.1 Troubleshooting the Cause of Solaris UFS File System Corruption and Preventing Future Corruption

The goal of this document is to provide guidance on using fsck(1M) to resolve the panics by cleaning up the file system corruption.


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