linux-ext4 - ext4/004 hangs with -o inlinecrypt,test_dummy

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Message-ID: <aTZ3ahPop7q8O5cE@infradead.org>
Date: Sun, 7 Dec 2025 22:59:54 -0800
From: Christoph Hellwig <hch@...radead.org>
To: linux-ext4@...r.kernel.org
Subject: ext4/004 hangs with -o inlinecrypt,test_dummy_encryption

Hi all,

I've just been wanting to test my changes to the inline encruption
fallback code, and it seems like ext/004 (the only ext4 dump test)
hangs when using the following options:

export MKFS_OPTIONS='-O encrypt'
export MOUNT_OPTIONS="-o inlinecrypt,test_dummy_encryption"

I thought I did not see this before, but it reproduces back to at least
Linux 6.17.  This is in an uptodate Debian trixie VM.  The dump/restore
process look like in weird states:

   4727 ttyS0    T      0:00 /usr/sbin/dump -0 -f - /mnt/scratch/dump_restore_dir
   4728 ttyS0    T      0:00 /usr/sbin/restore -urvf -
   4729 ttyS0    T      0:00 /usr/sbin/dump -0 -f - /mnt/scratch/dump_restore_dir
   4730 ttyS0    T      0:00 /usr/sbin/dump -0 -f - /mnt/scratch/dump_restore_dir
   4731 ttyS0    T      0:00 /usr/sbin/dump -0 -f - /mnt/scratch/dump_restore_dir
   4732 ttyS0    T      0:00 /usr/sbin/dump -0 -f - /mnt/scratch/dump_restore_dir