Dell Unity: Filesystem goes offline after attempting IMT commit operation on OE >=5.1 (User Correctable)

Summary: Filesystem goes offline after attempting IMT commit operation on OE 5.1.0.x, 5.1.1.x, or 5.1.2.x.

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Symptoms

A customer may see that a filesystem goes offline after attempting an IMT commit operation on OE 5.1 or newer. This can cause the commit operation to fail. Log messages such as these may be observed in the ktrace logs:

sade:UFS: 4:[User-VDM]  metadataDupReadBlock: fsid:123456789 fsbn:1234567890123 dataOK:1 fs_ronly:0 recomputeChecksum:1
sade:UFS: 6:[User-VDM]  metadataDupReadBlock: fsid:123456789 recomputed metadata block checksum bn 1234567890123 [DIRECTORY_IO] 
sade:UFS: 4:58:[User-VDM]  FsId: 123456789 repaired metadata online, type is DIRECTORY_IO's BMD, FSBN is 1234567890123.
sade:UFS: 3:[User-VDM]  duch:findROblock: id error block 0 mbits 0 depth 116 hash 00000003 this 322f3930
sade:UFS: 4:[User-VDM]  DuchDirHash dumps: fsid=123456789, ino=98765432109, dhp->minibits=0, dhp->flags=0x0, depth[0]=0 depth[1]=160
sade:UFS: 4:[User-VDM]  depth[2]=163 depth[3]=2 depth[4]=41 depth[5]=0 depth[6]=0 depth[7]=0
sade:UFS: 3:[User-VDM]  duch:findROblock: id error block 0 mbits 0 depth 116 hash 00000003 this 322f3930
sade:UFS: 4:[User-VDM]  DuchDirHash dumps: fsid=123456789, ino=98765432109, dhp->minibits=0, dhp->flags=0x0, depth[0]=0 depth[1]=160

sade:UFS: 3:[User-VDM]  Unmounting fs 123456789: Reason: duch findROblock identity mismatch
sade:CFS: 2:12:[User-VDM]  FsId: 123456789 encountered a critical fault, action (FREEZE_FS_RECOVERY_REQUIRED), FS (File System taken <---
sade:CFS: 2:12:[User-VDM]  offline (duch findROblock identity mismatch)) is unmounted internally.  <---
sade:CFS: 3:[User-VDM]  Panic Avoidance Exception Taken on Fs 123456789
sade:CFS: 3:[User-VDM]  Exception callers = 0x0000000000, 0x0000000000, 0x0000000000, 0x0000000000, 0x0000000000, 0x0000000000, 0x000
sade:CFS: 3:[User-VDM]  0000000
sade:CBFS: 6:[User-VDM]  internalErrorNotificationCallback fsmo of 123456789 start to freeze. Recovery needed.
sade:UFS: 3:[User-VDM]  Panic Avoidance found 123456789 corrupted (duch findROblock identity mismatch)
sade:CFS: 6:[core]  FSRescue is freezing fs 123456789

 

Cause

An issue with a newer IMT function in 5.1.x is resulting in a regular file having readdir issued on it when this should only occur on a directory.

Resolution

A code fix is implemented in 5.1.3.x and 5.2.x. If you get this issue you should be able to re-attempt the commit and see it succeed the second time around. If this does not work, you can upgrade first before re-attempting the migration.

Affected Products

Dell EMC Unity
Article Properties
Article Number: 000192942
Article Type: Solution
Last Modified: 26 May 2025
Version:  3
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