Bug#856337: systemd: please support kernel 4.4, or don't hardcode dm interface versions

[Michael Biebl]

Am 28.02.2017 um 14:27 schrieb Marc Lehmann:
> On Tue, Feb 28, 2017 at 02:25:34AM +0100, Michael Biebl <biebl at debian.org> wrote:
>>> The specific error I got was something like (from memory):
>>>
>>>    Could not detach DM dm-11: ioctl mismatch, kernel(4.34.4), user(4.35.4)
>>>
>>
>> That doesn't look like a systemd problem, systemd should work fine with
>> kernel 4.4.
> 
> Well, it doesn't - downgrading it to jessie makes it work again with
> kernel 4.4.
> 
> However, great to hear that systemd *is* supposed to work with kernel 4.4,
> so this is a real bug and not a wishlist (I forgot to mark it as wishlist
> originally, which I thought it is).
> 
>> Can you please elaborate why you filed this against systemd?
> 
> Because I thought systemd is what cleans up dm-targets at shutdown. 

From your initial bug report, it was not clear where exactly you got
this message. Yes, systemd-shutdown does try to stop dm devices on shutdown.

Christian's input was helpful.
TBH, I find it rather broken having to embed a local copy of dm-ioctl.h
to work around this.

Christian, this version mismatch, does that happen for minor version
differences as well, like say 4.10.0 vs 4.10.1 or only major versions
like 4.10.x vs 4.11.x?

-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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