Crash using kmod-hfsplus on cp -a from one memory stick to another

[Roger Sewell <roger.sewell@cantab.net>]

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Hello,

I understand that kmod-hfsplus is now no longer maintained, so that
reporting this is unlikely to get any attention; my motivation in
reporting it is to ensure that the existence of this bug is recorded
somewhere in case anybody looks at this module again.

Versions in use:

kernel.x86_64 5.14.0-70.17.1.el9_0 (rockylinux 9.0)
kmod-hfsplus.x86_64 0.4-1.el9 from elrepo
hfsplus-tools.x86_64 540.1.linux3-26.el9 from elrepo

How reproducible: always

Steps to produce:

1. Format a partition on each of two memory sticks with hfsplus using
   mkfs.hfsplus; 

2. Mount one of them on <mnt1> and the other on <mnt2>;

3. Populate <mnt1> with the contents of a standard rockylinux live
   stick's hfsplus partition (partition 3 of such a stick) (although the
   exact contents of the filesystem may not be important);

4. cp -a <mnt1>/* <mnt2>

Result: System crashes, leaving nothing in /var/log/messages.

Attached: kexec-dmesg.log and vmcore-dmesg.txt from the crash dump
(vmcore is too large).

Additional information: I've tried doing the same with vfat partitions
and the same problem does not occur. Nor does it occur if -r is
substituted for -a in the copy. Nor does it occur if copying is from
ext4 on disk to stick or vice versa.

I'm afraid that updating to later kernels and the like is beyond what I
have time (or expertise) to contribute - apologies.

Roger Sewell.


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