[Bug 254530] ZFS (base) receive fails to receive zvol dataset if dataset already exist

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254530

--- Comment #4 from Patrik Hildingsson <patrik at hildingsson.se> ---
(In reply to Alan Somers from comment #3)
The error occurs even in FreeBSD 12.2-STABLE r369477

root at testbsd:~ # zfs create zroot/test
root at testbsd:~ # zfs create -o volmode=dev -V 50M zroot/test/disk0
root at testbsd:~ # dd if=/dev/random of=/dev/zvol/zroot/test/disk0
dd: /dev/zvol/zroot/test/disk0: end of device
102401+0 records in
102400+0 records out
52428800 bytes transferred in 1.582797 secs (33124142 bytes/sec)
root at testbsd:~ # zfs snapshot zroot/test/disk0 at test-now_ok
root at testbsd:~ # dd if=/dev/random of=/dev/zvol/zroot/test/disk0
dd: /dev/zvol/zroot/test/disk0: end of device
102401+0 records in
102400+0 records out
52428800 bytes transferred in 0.926790 secs (56570297 bytes/sec)
root at testbsd:~ # zfs snapshot zroot/test/disk0 at test-now_ok-2
root at testbsd:~ # dd if=/dev/random of=/dev/zvol/zroot/test/disk0
dd: /dev/zvol/zroot/test/disk0: end of device
102401+0 records in
102400+0 records out
52428800 bytes transferred in 1.235393 secs (42438953 bytes/sec)
root at testbsd:~ # zfs create -V 52428800 -o 'reservation=none' -o
'volblocksize=8192' -o 'checksum=on' -o 'compression=lz4' -o 'readonly=off' -o
'copies=1' -o 'logbias=throughput' -o 'dedup=off' -o 'sync=standard' -o
'volmode=dev' -o 'snap
shot_limit=none' -o 'redundant_metadata=most' zroot/test/disk1
root at testbsd:~ # zfs send zroot/test/disk0 at test-now_ok | zfs receive -F
zroot/test/disk1
cannot open 'zroot/test/disk1/': trailing slash in name
warning: cannot send 'zroot/test/disk0 at test-now_ok': signal received
root at testbsd:~ # uname -K
1202505
root at testbsd:~ # uname -U
1202505
root at testbsd:~ # freebsd-version
12.2-STABLE

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