[Xen-API] xenbus_printf causes system reboot in kernel module

[weiming <zephyr.zhao@xxxxxxxxx>]

I use
xenbus_printf(XBT_NIL,"mydir", "command", "%s", "do_something");

in my kernel module, which causes my system to reboot.

Do I miss something, like initialization code before this call?

Thanks,
Weiming

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