A recent version of the Opensolaris source bits contained a serious bug that could cause corruption in ZFS pools under certain circumstances:
6526196 ZFS: assertion failed: zp->z_phys->zp_links > zp_is_dir Specifically, this was a bug in the ZFS source file: dbuf.c. The bug has now been fixed, and the current opensolaris source contains this fix. But users who may have built opensolaris using source dating from Feb 02 to Feb 24 should be wary. Please check out the Heads-up message at: http://opensolaris.org/os/community/on/flag-days/pages/2007022301/ Those running Solaris Express will not be impacted by this bug. This bug is *not* present in any current release of Solaris Express. However, the next release of the Solaris Express Community Edition (build 58) will be skipped in favor of build 59, which is already being assembled by the Release Engineering team. ZFS Development Team
