vsyscall=none in backports kernel?

[Harald Dunkel <harald.dunkel@aixigo.de>]

Hi folks,

Running 4.8.11 from the backports repository for Jessie I found
this in kern.log:

Jan  1 03:00:53 dpcl082 kernel: [829504.082278] dpkg[24427] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7fff8cb7c818 ax:ffffffffff600400 si:428720 di:7fff8cb7c830
Jan  1 03:00:53 dpcl082 kernel: [829504.082281] dpkg[24427]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007fff8cb7c818 error 15

AFAICT this happened during the unattended upgrades at night.
I haven't seen this error in interactive use yet. But its
dpkg 1.17.27, not some weird binary-only package grabbed from
a 3rd-party repository.

I wonder if setting vsyscall=none in the backports kernel is
a good idea. Is it safe to use together with Jessie's regular
packages?


Regards
Harri