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Date:      Sat, 20 Aug 2022 00:54:04 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 265951] ext2fs: kernel panic when trivial rsync operation from zfs to ext3 partitions
Message-ID:  <bug-265951-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D265951

            Bug ID: 265951
           Summary: ext2fs: kernel panic when trivial rsync operation from
                    zfs to ext3 partitions
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: clear.screen@orange.fr

When doing rsync trivial (avz) operations from zfs dataset to ext3 partition
mounted with ext2fs.ko module, a kernel panic occurs trashing the whole ser=
ver.

First UFS filesystem (first disk) is corrupted
Second UFS filesytem (second disk) is corrupted
Ext3fs filesystem (third disk) is corrupted

This is the output of /var/log/daemon.log

Aug 19 07:27:47 myServer savecore[1396]: reboot after panic: ext2_dirbad:
/EXT3-TARGET: bad dir ino 164859907 at offset 0: mangled entry
Aug 19 07:27:47 myServer savecore[1396]: writing core to /var/crash/vmcore.1

- The ext2fs stability and reliability have to be fixed. This is mandatory.
- Perhaps this was improved on the 13.1 branch ?
- Is there a safe way to manage ext3 filesystems regarding kernel panic ?

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