Hello,

On Tue, Feb 15, 2022 at 01:58:56PM +0100, Uwe Kleine-König wrote:
> On Tue, Feb 15, 2022 at 01:41:20PM +0100, Krzysztof Kozlowski wrote:
> > On 15/02/2022 11:49, Uwe Kleine-König wrote:
> > > [... Something inserted a space in Subject lines ...]
> > 
> > Other threads - not only mine - are also affected:
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2022-February/714311.html
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2022-February/714316.html
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2022-February/714364.html
> 
> In the meantime I'm confident that mailman2 is the culprit.

For the record: Using python2 (which is what mailman2 uses):

>>> from email.header import Header
>>> h = Header('[PATCH v2 08/15] dt-bindings: pwm: renesas,pwm: Include generic pwm schema', maxlinelen=76, header_name='Subject')
>>> h.encode()
'[PATCH v2 08/15] dt-bindings: pwm: renesas,\n pwm: Include generic pwm schema'

This is the inner source of the problem, mailman just does something
like:

>>> import email
>>> a = email.message_from_file(open('message'))
>>> open('message-mangled', 'w').write(a.as_string())

So we just have to wait until all mailserver admins migrate away from
mailman2. I bet this will happen no later than when Python2 will become
EOL. :-\

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |