Re: Debian 10, xen 4.11 reliability

[Casper <kl@xxxxx>]

Was playing with system little bit, got only day uptime and it crashed 
this time with diff. msg:
Jul 20 19:20:28 test systemd[1]: Stopping Availability of block devices...
Jul 20 19:20:28 test systemd[1]: session-1.scope: Killing process 866 
(screen) with signal SIGTERM.
Jul 20 19:20:28 test systemd[1]: session-1.scope: Killing process 867 
(bash) with signal SIGTERM.
Jul 20 19:20:28 test systemd[1]: session-1.scope: Killing process 955 
(bash) with signal SIGTERM.
Jul 20 19:20:28 test systemd[1]: session-1.scope: Killing process 30295 
(ssh) with signal SIGTERM.
Jul 20 19:20:28 test systemd[1]: session-1.scope: Killing process 30298 
(sshfs) with signal SIGTERM.
Jul 20 19:20:28 test systemd[1]: session-1.scope: Killing process 30307 
(ssh) with signal SIGTERM.
Jul 20 19:20:28 test systemd[1]: session-1.scope: Killing process 30310 
(sshfs) with signal SIGTERM.
Jul 20 19:20:28 test systemd[1]: session-1.scope: Killing process 2730 
(xl) with signal SIGTERM.
Jul 20 19:20:28 test systemd[1]: session-1.scope: Killing process 3061 
(xl) with signal SIGTERM.
Jul 20 19:20:28 test systemd[1]: Stopping Session 1 of user casper.
Jul 20 19:20:28 test systemd[1]: Stopping Session 352 of user casper.
Jul 20 19:20:28 test systemd[1]: Stopping LVM event activation on device 
9:2...
Jul 20 19:20:28 test systemd[1]: Stopping Session 419 of user root.
Jul 20 19:20:28 test systemd[1]: lvm2-lvmpolld.socket: Succeeded.
Jul 20 19:20:28 test systemd[1]: Closed LVM2 poll daemon socket.
Jul 20 19:20:28 test systemd[1]: Stopped target Graphical Interface.
Jul 20 19:20:28 test systemd[1]: Stopped target Multi-User System.


On 20.07.20 11:53, Casper wrote:
> Hello,
>
> I can report I have root and rest fs ext3 too, but is it correct Debian 
> uses ext4 for mounting ext3?
> [    8.314622] EXT4-fs (md0): mounting ext3 file system using the ext4 
> subsystem
> [   10.192765] EXT4-fs (md0): mounted filesystem with ordered data mode. 
> Opts: (null)
> All domU use ext3, even new debian machines.
>
> Casper
>
> On 16.07.20 06:57, Sarah Newman wrote:
> > On 7/14/20 2:00 AM, Hans van Kranenburg wrote:
> > > On 7/14/20 1:16 AM, Adam Goryachev wrote:
> > > > On 14/7/20 03:02, Hans van Kranenburg wrote:
> > > > > Hi Casper,
> > > > >
> > > > > On 7/9/20 10:45 AM, Casper wrote:
> > > > > > [...]
> > > > > > Or problem with Debian Xen package as it not so popular anymore?
> > > > > > Any suggestion what to test to figure out problem?
> > > > BTW, I don't think is a general rule that Debian 10.4 with packages Xen
> > > > 4.11 doesn't work.
> > > True. It just works (tm), until you have some edge case hardware that
> > > misbehaves, or you run into an edge case bug with a very specific
> > > combination of non-default configuration here and there (or when you try
> > > to use EFI, cough).
> > >
> > > So, to add to the list:
> > > * Run latest BIOS / cpu microcode that is available.
> > > * Other firmware, e.g. for raid controller or whatever?
> > > * Is the box using ECC memory? I mean, even a memory module that flips a
> > > bit now and then can crash a server every few weeks... Run a memtest or
> > > 7zip benchmark or what was the thing that's very good at exposing memory
> > > errors...
> > >
> > > Also, feel free to open a bug report in the Debian bug tracker, we're
> > > willing to help, but expect that you have to do the work to gather all
> > > info. I don't have a similar piece of hardware lying around here... What
> > > distro package maintainers can do is help users to gather enough info to
> > > have a good report that doesn't waste too much time of the upstream
> > > developers.
> > Here is a bug I opened a week ago against Debian Buster:
> >
> > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964494
> >
> > It looks like only newer versions of the kernel are a problem. We 
> > think the trigger is either ext3 or Xen.
> > The problem may not show up for weeks, and we do not know what 
> > triggers it.
> > If anyone has more data points to add that would help isolate the 
> > issue to one or the other, it would be appreciated.
> > --Sarah