just to let you know what happened in the meantime:
I was able to open a Service Request at Oracle.
The issue is a known bug (Bug 6742788 : assertion panic at: zfs:zap_deref_leaf)
The bug has bin fixed (according to Oracle support) since build 164, but there
is no fix for Solaris 11 available so far (will be fixed in S11U7?).
There is a workaround available that works (partly), but my system crashed
again when trying to rebuild the offending zfs within the affected zpool.
At the moment I'm waiting for a so called "interim diagnostic relief" patch....
Max Planck Institut fuer marine Mikrobiologie
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