Assertion 'udev_device' failed at src/libudev/libudev-device.c:742, function udev_device_get_sysattr_value(). Aborting.

I seem to be hitting some very weird corner case causing an assertion failure. The offender is ZFS Event Daemon:

The following code shows the offence:

                               struct udev_device *dev;

                               if ((dev = udev_monitor_receive_device(mon)) == NULL) {

                                               zed_log_msg(LOG_WARNING, "zed_udev_monitor: receive "

                                                   "device error %d", errno);

                                               continue;

                               }

                               …..

                               sectors = udev_device_get_property_value(dev,

                                                    "ID_PART_ENTRY_SIZE");

                               if (sectors == NULL)

                                               sectors = udev_device_get_sysattr_value(dev, "size");

Im at a loss here as to what’s causing the assertion failure. Both udev_device_get_property_value and udev_device_get_sysattr_value only assert a valid udev_device pointer. How can the pointer get lost between these two function calls?

-Sietse