[uml-user] shutdown problems

[Frank L. <len...@pa...>]

I have some strange problems when I try to shutdown a uml
instance. Although my findings also go into the direction of syslogd,
I don't think this is related to what is described in the UML HOWTO
(http://user-mode-linux.sourceforge.net/UserModeLinux-HOWTO-13.html#ss13.12=
).

--- begin ---
Stopping kernel log daemon: klogdKernel panic: read of switch_pipe
failed, errno =3D 9=20
sleeping process 11448 got unexpected signal : 11
---  end  ---

doing a ps aux | grep 11448 reveals:

--- begin ---
frank    11448  0.0  0.6 35256 4860 pts/3    T    11:24   0:00
/usr/bin/linux  [/sbin/klogd]
eth0=3Dtuntap,,,192.168.2.4 ubd0=3D/space/uml/host/neptunus/root_fs=20
---  end  --

which makes that I always have to do a killall linux (currently only
running one uml on this machine).=20

Apparently, there seems to be a problem with klogd on uml:

- doing an /etc/init.d/klogd stop followed by /etc/init.d/sysklogd
  stop, which is the same as when the shutdown is initiated through
  init (on Debian, we have K89klogd and K90sysklogd), the shutdown
  process is ok

- doing an /etc/init.d/klogd stop, then /etc/init.d/sysklogd stop,
  then sysklogd start, then /etc/init.d/klogd start followed by a
  shutdown, also works

- doing just an /etc/init.d/klogd stop or doing an /etc/init.d/klogd
  stop followed by an /etc/init.d/klogd start, gives another kernel
  panic related to the init process on uml:

--- begin ---
INIT: Sending processes the TERM signal
Kernel panic: read of switch_pipe failed, errno =3D 9
Kernel panic: read of switch_pipe failed, errno =3D 9
sleeping process 22939 got unexpected signal : 11
---  end  ---

where pid 22939 on the host system is the uml init process:

--- begin ---
frank 22939 0.0 0.6 35044 5348 pts/3 T 15:41 0:00 /usr/bin/linux
(neptunus) [/sbin/init] eth0=3Dtuntap,,,192.168.2.4
ubd0=3D/space/uml/host/neptunus/root_fs umid=3Dneptunus
---  end  ---

--=20
len...@pa...

Those who do not understand Unix are condemned to reinvent it, poorly."
-- Henry Spencer