linux-image-5.10.0-0.bpo.3-amd64: sync gets stuck

[Harald Dunkel <harald.dunkel@aixigo.com>]

Hi folks,

using linux-image-5.10.0-0.bpo.3-amd64 (buster-backports) and dd
to write an iso image (e.g. ubuntu-20.10-desktop-amd64.iso) to an
USB stick:

dd stops writing and closes source and destination file handle, but
it does not exit. It cannot be interrupted, either. At shutdown time
the system runs into several timeouts, indicating that sync gets
stuck.

Using 4.19.181-1 there is no such problem.

Can anybody reproduce this problem?


Regards
Harri