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Date:   Tue, 28 May 2019 19:45:15 +0200
From:   Benjamin Tissoires <>
To:     Jiri Kosina <>
Cc:     Dave Hansen <>,
        Hans de Goede <>,
        "open list:HID CORE LAYER" <>,
        LKML <>
Subject: Re: hid-related 5.2-rc1 boot hang

On Tue, May 28, 2019 at 7:15 PM Jiri Kosina <> wrote:
> On Tue, 28 May 2019, Dave Hansen wrote:
> > I have a system that works fine on 5.1.  When updating to 5.2-rc1, it
> > hangs at boot waiting on an instance of systemd-udevd.  The kernel
> > backtrace ( looks like it's
> > doing an finit_module() that dives into the hid code and is waiting on a
> > request_module().
> Dave,
> thanks for the report.
> Just to confirm -- I guess reverting 4ceabaf79 and a025a18fe would work
> this around, right?

It would be also interesting to know which distribution and which
systemd version you are running (if you are on systemd).

This rings a bell as I recall  playing with
request_module/request_firmware a while ago, but Hans convinced me
that no such delay would be induced.


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