kernel panic on bullseye when copying files to a drive with not enough space

Dear all,

i would like to report a kernel panic (first time in my life with debian).

i was copying all files from 1 hdd to a second (both not running debian,
just 1 partition with ext4 on both). the file size did vary between small
to a few GB. (music movies mainly)

for copying i was using mc. du on source hdd was 688G but unfortunately the
target drive had only ~687G free space (this i did not notice when starting
the copy/backup). at the end i have got messages regarding retrieving
incomplete files from mc. just before the crash the HDD heads started to
click wildly.

i aborted the copy in mc. did quit mc. did run sync successfully and
unmount successfully.

a few seconds later kernel went into panic. (sorry no screenshot). when
checking the FS of the target hdd ext4 was not corrupted.

feel free to reproduce this.

Yours Faithfully

E