sudo btrbk -l debug -v -c /etc/btrbk/btrbk-manual.conf dryrun
btrbk command line client, version 0.19.2  (Sat Jul 18 19:28:19 2015)
Using configuration: /etc/btrbk/btrbk-manual.conf
### btrfs subvolume show '/mnt/ssd-crypt' 2>&1
Command execution successful
found btrfs root: /mnt/ssd-crypt
### btrfs subvolume list -a -c -u -q -R '/mnt/ssd-crypt'
Command execution successful
Parsed 13 total subvolumes for filesystem at: /mnt/ssd-crypt
Found 13 subvolume children of: /mnt/ssd-crypt
### btrfs subvolume show '/backup/backup-root' 2>&1
Command execution successful
WARNING: Failed to parse subvolume detail "Object ID": /backup/backup-root
	Name: 			backup-root
	UUID: 			4c791925-6637-7f49-9d94-8c1ee9ff97d4
	Parent UUID: 		-
	Received UUID: 		-
	Creation time: 		2015-06-19 19:21:44 -0500
	Subvolume ID: 		585
	Generation: 		1245
	Gen at creation: 	1087
	Parent ID: 		5
	Top level ID: 		5
	Flags: 			-
	Snapshot(s):
WARNING: Failed to parse subvolume detail "Generation \(Gen\)": /backup/backup-root
	Name: 			backup-root
	UUID: 			4c791925-6637-7f49-9d94-8c1ee9ff97d4
	Parent UUID: 		-
	Received UUID: 		-
	Creation time: 		2015-06-19 19:21:44 -0500
	Subvolume ID: 		585
	Generation: 		1245
	Gen at creation: 	1087
	Parent ID: 		5
	Top level ID: 		5
	Flags: 			-
	Snapshot(s):
WARNING: Failed to parse subvolume detail "Parent uuid": /backup/backup-root
	Name: 			backup-root
	UUID: 			4c791925-6637-7f49-9d94-8c1ee9ff97d4
	Parent UUID: 		-
	Received UUID: 		-
	Creation time: 		2015-06-19 19:21:44 -0500
	Subvolume ID: 		585
	Generation: 		1245
	Gen at creation: 	1087
	Parent ID: 		5
	Top level ID: 		5
	Flags: 			-
	Snapshot(s):
WARNING: Failed to parse subvolume detail "Parent": /backup/backup-root
	Name: 			backup-root
	UUID: 			4c791925-6637-7f49-9d94-8c1ee9ff97d4
	Parent UUID: 		-
	Received UUID: 		-
	Creation time: 		2015-06-19 19:21:44 -0500
	Subvolume ID: 		585
	Generation: 		1245
	Gen at creation: 	1087
	Parent ID: 		5
	Top level ID: 		5
	Flags: 			-
	Snapshot(s):
WARNING: Failed to parse subvolume detail "Top Level": /backup/backup-root
	Name: 			backup-root
	UUID: 			4c791925-6637-7f49-9d94-8c1ee9ff97d4
	Parent UUID: 		-
	Received UUID: 		-
	Creation time: 		2015-06-19 19:21:44 -0500
	Subvolume ID: 		585
	Generation: 		1245
	Gen at creation: 	1087
	Parent ID: 		5
	Top level ID: 		5
	Flags: 			-
	Snapshot(s):
WARNING: Failed to parse subvolume detail "uuid": /backup/backup-root
	Name: 			backup-root
	UUID: 			4c791925-6637-7f49-9d94-8c1ee9ff97d4
	Parent UUID: 		-
	Received UUID: 		-
	Creation time: 		2015-06-19 19:21:44 -0500
	Subvolume ID: 		585
	Generation: 		1245
	Gen at creation: 	1087
	Parent ID: 		5
	Top level ID: 		5
	Flags: 			-
	Snapshot(s):
Parsed 5 subvolume detail items: /backup/backup-root
### btrfs subvolume list -a -c -u -q -R '/backup/backup-root'
Command execution successful
Parsed 25 total subvolumes for filesystem at: /backup/backup-root

ERROR: process died unexpectedly (btrbk v0.19.2)
Please contact the author: Axel Burri <axel@tty0.ch>

Stack Trace:
----------------------------------------
Use of uninitialized value in hash element at /usr/bin/btrbk line 926, <FILE> line 115.
 at /usr/bin/btrbk line 119, <FILE> line 115.
	main::__ANON__("Use of uninitialized value in hash element at /usr/bin/btrbk "...) called at /usr/bin/btrbk line 926
	main::btr_tree(HASH(0x265f0f8)) called at /usr/bin/btrbk line 956
	main::vinfo_subvol_list(HASH(0x265f0f8)) called at /usr/bin/btrbk line 296
	main::vinfo_root(HASH(0x265f0f8)) called at /usr/bin/btrbk line 1734