linux-kernel - Re: [PATCH 1/2] kobject: return error code if writing /sys/.../uevent fails

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Date:   Thu, 29 Apr 2021 09:40:08 -0400
From:   Phillip Susi <phill@...susis.net>
To:     gregkh@...uxfoundation.org, rafael@...nel.org, jeyu@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     msekleta@...hat.com, Peter Rajnoha <prajnoha@...hat.com>
Subject: Re: [PATCH 1/2] kobject: return error code if writing /sys/.../uevent
 fails

Just an FYI, I've been tracking down a bug that was causing the debian
bullseye installer to immediately crash and reboot the xen domU and
bisected it to this commit.  It appears that the Xen Virtual Keyboard
driver ( and at least one other, probably more ) were always broken and
failed to trigger the udev event, but this was never noticed.  When this
patch returned the error code, it caused the d-i init scripts triggering
coldplug events to fail, which caused init to bail out, causing a kernel
panic.

In the future, when fixing error returns like this, could you please add
a big fat printk so that hopefully things that always should have failed
but didn't and now do can get noticed and fixed more quickly.

https://bugzilla.kernel.org/show_bug.cgi?id=207695
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=983357