[systemd-devel] /dev or /tmp disappears when program is running

[Steven Shiau]

On 9/9/2015 PM 02:11, Lennart Poettering wrote:
> On Wed, 09.09.15 10:50, Steven Shiau (steven at nchc.org.tw) wrote:
>
>>
>> On 9/8/2015 PM 10:05, Lennart Poettering wrote:
>>> On Tue, 08.09.15 20:45, Steven Shiau (steven at nchc.org.tw) wrote:
>>>
>>>> Dear systemd developers,
>>>> I encountered a very weird issue, i.e. the /dev or /tmp disappears when
>>>> program is running.
>>>> The client system is nfsroot (diskless), running on the Debian Sid with
>>>> Linux kernel 4.1.0-2-amd64. The PXE/NFS server is a Debian Live system
>>>> running NFS server by unfs3 [1], its mounting status is attached as
>>>> "server-table.txt", and the client's initial mounting status is attached
>>>> as "client-table.txt". You can see /dev/ is mounted as devtmpfs. This is
>>>> quite normal.
>>>> When a system deployment program (clonezilla [2]) is run in the diskless
>>>> client machine, suddenly the /dev/ is gone, as shown in the attached
>>>> file "client-table-dev-missing.txt". You can see "/dev/" is missing. To
>>>> narrow down the issue, I have switched to sysvinit, but still use
>>>> systemd-udevd on this Debian Sid system.
>>>
>>> What makes you think this is a systemd issue, and not a clonezilla issue?
>>>
>>> Lennart
>>>
>> BTW, attached please find the systemd-udevd debug info. I killed the
>> original systemd-udevd then ran it again with --debug.
>> You can find the problem occurred about in line 4859.
>> Hope this helps.
>> If you need more info, please let me know.
>> Any comments would be highly appreciated.
>> Thanks.
>
> Well, you see that "bcache-probe" is invoked right before things go
> bad? Whatever that is, maybe that's the problem? Have you tried
> turning that rules file off?
Thanks. Yes, a few hours ago I disabled it by removing bcache-tools, and 
the issue still remains.
So I tried a little further, by removing 
/lib/udev/rules.d/60-persistent-storage.rules, and this issue is gone.
I need to do more tests, but so far I have tested 3 times and all 
diskless/systemless clients I have tested look OK, no /dev/ missing issue.
Any new rules in /lib/udev/rules.d/60-persistent-storage.rules could 
cause this problem on a nfsroot client?
Appreciate.

Steven.
>
> Lennart
>

-- 
Steven Shiau <steven _at_ stevenshiau org>
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