K 10 svn:author V 7 delphij K 8 svn:date V 27 2013-07-30T20:37:32.578822Z K 7 svn:log V 496 MFV r253780: To quote Illumos #3875: The problem here is that if we ever end up in the error path, we drop the locks protecting access to the zfsvfs_t prior to forcibly unmounting the filesystem. Because z_os is NULL, any thread that had already picked up the zfsvfs_t and was sitting in ZFS_ENTER() when we dropped our locks in zfs_resume_fs() will now acquire the lock, attempt to use z_os, and panic. Illumos ZFS issues: 3875 panic in zfs_root() after failed rollback MFC after: 2 weeks END