Bug#791944: /etc/init.d/sendsigs kills systemd-udevd upon shutdown, causing dmsetup to hang

[Michael Biebl]

Am 05.06.2017 um 09:59 schrieb Pali Rohár:
> On Monday 05 June 2017 00:49:47 Michael Biebl wrote:
>> Am 03.06.2017 um 19:44 schrieb Michael Biebl:
>>> Am 03.06.2017 um 17:24 schrieb Felipe Sateler:
>>>
>>>> diff --git a/debian/udev.init b/debian/udev.init
>>>> index ffef3ea6a..dcc5c29d5 100644
>>>> --- a/debian/udev.init
>>>> +++ b/debian/udev.init
>>>> @@ -208,6 +208,7 @@ case "$1" in
>>>>      stop)
>>>>      log_daemon_msg "Stopping $DESC" "$NAME"
>>>>      if start-stop-daemon --stop --name $NAME --user root --quiet --oknodo --retry 5; then
>>>> +	rm -f /run/udev/control
>>>
>>> I think this is the correct fix, yes.
>>>
>>> We need to keep in mind though, that udev currently does not install any
>>> stop (K) symlinks in runlevel 0 and 6, but we rely on the killing spree
>>> in sendsigs to kill the udev process on shutdown.
>>>
>>> Which means, we'd need to start installing those K symlinks in 0 6.
>>> For that, edit /etc/init.d/udev, add
>>> # Default-Stop: 0 6
>>> to the LSB header, then run
>>>
>>> # rm /etc/rcS.d/???udev
>>> # update-rc.d udev defaults
>>
>> We need people using sysvinit to test that proposed fix and report back
>> if it fixes that issue and does not introduce any new regressions.
> 
> That patch does not work, because order is:
> 
> /etc/rc0.d/K08cryptdisks
> /etc/rc0.d/K09cryptdisks-early
> /etc/rc0.d/K10udev
> 
> So that fix is called *after* crytptdisks which is too late.

Huh, how is that a problem?
Either udev is running and the socket is available,
or udev is not running and the socket is not available.

The problem afaiu is that udev was not running but the socket was still
present.


Have you actually tested the patch? If so, what was the problem?


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

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