Date: Fri, 20 Nov 2015 21:54:13 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 204705] zfs receive mounts received dataset even if -u is given Message-ID: <bug-204705-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204705 Bug ID: 204705 Summary: zfs receive mounts received dataset even if -u is given Product: Base System Version: 10.2-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: vlad-fbsd@acheronmedia.com It appears that `zfs send -R <root-dataset-snapshot> | zfs receive -Fdu <external-media-dataset>` will mount the received dataset despite the -u flag. I discovered this sending the root partition having mountpoint=/ which broke devfs. Below is a session done in a clean new (KVM) VM install with two disks to replicate the issue: root@freebsd:~ # zpool status pool: zroot state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM zroot ONLINE 0 0 0 vtbd0p2 ONLINE 0 0 0 errors: No known data errors root@freebsd:~ # zpool list NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT zroot 3.97G 830M 3.16G - 13% 20% 1.00x ONLINE - root@freebsd:~ # zfs list NAME USED AVAIL REFER MOUNTPOINT zroot 830M 3.03G 829M / root@freebsd:~ # zpool list -t snapshot NAME USED AVAIL REFER MOUNTPOINT zroot@test-snapshot 496K - 829M - root@freebsd:~ # zpool create zbackup vtbd1 root@freebsd:~ # zfs create zbackup/backup root@freebsd:~ # zfs list NAME USED AVAIL REFER MOUNTPOINT zbackup 250K 3.84G 19K /zbackup zbackup/backup 19K 3.84G 19K /zbackup/backup zroot 830M 3.03G 829M / root@freebsd:~ # zfs send -R zroot@test-snapshot | zfs receive -Fdu zbackup/backup root@freebsd:~ # zfs list internal error: failed to initialize ZFS library root@freebsd:~ # mount zroot on / (zfs, local, nfsv4acls) devfs on /dev (devfs, local, multilabel) zbackup on /zbackup (zfs, local, nfsv4acls) zbackup/backup on / (zfs, local, nfsv4acls) root@freebsd:~ # mount -t devfs devfs /dev root@freebsd:~ # zfs list NAME USED AVAIL REFER MOUNTPOINT zbackup 829M 3.03G 19K /zbackup zbackup/backup 829M 3.03G 829M / zroot 830M 3.03G 829M / root@freebsd:~ # zfs mount zroot / zbackup /zbackup zbackup/backup / root@freebsd:~ # zpool export zbackup cannot unmount '/': Device busy -- You are receiving this mail because: You are the assignee for the bug.
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