Xin LI 44e362e207 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		2013-07-30 20:37:32 +00:00
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opensolaris	MFV r253780:	2013-07-30 20:37:32 +00:00