From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#37757: Kernel panic upon shutdown
Date: Mon, 28 Oct 2019 23:28:30 +0100
Message-ID: <874kzsfqsx.fsf@gnu.org>
References: <0876c9961fdffa47be54b756a05eb6320b6bdb18.camel@gmail.com>
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 Gibbons's message of "Mon, 14 Oct 2019 21:49:32 -0600")
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To: Jesse Gibbons <jgibbons2357@gmail.com>
Cc: 37757@debbugs.gnu.org

Hi,

Jesse Gibbons <jgibbons2357@gmail.com> skribis:

> Attached is a picture of the kernel panic. It happened when I tried to sh=
ut
> down.
> I do not know what log to look at to get any details about what happened
> about that time. Of course, the panic itself is not in any of the logs in
> /var/log.
> This is not the first time there was a kernel panic during the shutdown
> process.

I=E2=80=99ve just seen it on a laptop running GNOME and =E2=80=98%desktop-s=
ervices=E2=80=99.
The kernel panic appeared right after shutting down ModemManager (I
don=E2=80=99t have ModemManager on my own laptop and I=E2=80=99ve never exp=
erienced the
bug, but I don=E2=80=99t know if it=E2=80=99s significant.)

Note that we see (roughly):

  attempted to kill init! exit code=3D0x0000000b

which, unless I=E2=80=99m mistaken, means that PID=C2=A01 segfaulted (SIGSE=
GV =3D 11),
which is bad.

According to reboot(2), the =E2=80=98reboot=E2=80=99 syscall doesn=E2=80=99=
t return in this
case, so the segfault must have happened before the =E2=80=98reboot=E2=80=
=99 call.

The problem appeared roughly after the =E2=80=98core-updates=E2=80=99 merge=
, but I don=E2=80=99t
see any change to the =E2=80=98reboot=E2=80=99 wrapper in glibc 2.29.

Is it reproducible for you in a VM built with =E2=80=98guix system vm=E2=80=
=99?  If
would be helpful if we had that.

Thanks,
Ludo=E2=80=99.