Okay, I think I have figured this out. Pretty scary if I'm right The box runs headless and has a serial console. I basically copied the configuration from a gutsy box for this which gives me the following settings in grub/menu.lst
--- ## Xen hypervisor options to use with the default Xen boot option # xenhopt=console=com1,vga com1=57600,8n1 ## Xen Linux kernel options to use with the default Xen boot option # xenkopt=console=ttyS0,57600n1 --- This shows all xen, kernel and bootup messages right until the "Running local boot scripts", but obviously no prompt. For that I copied the file /etc/event.d/ttyS0 from a gutsy box as well --- start on stopped rc2 start on stopped rc3 start on stopped rc4 start on stopped rc5 stop on runlevel 0 stop on runlevel 1 stop on runlevel 6 respawn exec /sbin/getty -L ttyS0 57600 vt102 --- I still did not get a prompt but did not have a second look, because the box was crashing very frequently and I tried to figure out this problem first. Today I learned that I need to use xvc0 instead of ttyS0. I changed my config, got a login prompt and the box was suddenly way more stable. It usually died within minutes when I did something I/O intensive (e.g. bonnie++, no matter whether on a local partition or a drbd8 volume, or using debootstrap) I did the test, after reenabling ttyS0 the box crashed as violent and often as before. It does not appear to happen when ttyS0 is started after the bootup process. Every access to ttyS0 is blocked with an Input/Output error, so getty is restarted in a loop by upstart. My guess is that accessing/writing to ttyS0 from within dom0 compromises kernel memory and leads to a crash at some time. Removed ttyS0 now and will be running bonnie++ on a drbd volume over night, I hope I can confirm this tomorrow. -- [hardy][xen] Oops in free_hot_cold_cache, probably drbd8-related https://bugs.launchpad.net/bugs/235783 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
