Using host libthread_db library "/lib/libthread_db.so.1".
Core was generated by `zfs send -R Backups today'.
Program terminated with signal 11, Segmentation fault.
#0  0x000000000042a656 in zfs_prop_readonly (prop=4294967295)
    at lib/libzfscommon/zfs_prop.c:375
375		return (zfs_prop_table[prop].pd_attr == PROP_READONLY ||
#0  0x000000000042a656 in zfs_prop_readonly (prop=4294967295)
    at lib/libzfscommon/zfs_prop.c:375
No locals.
#1  0x0000000000422b5c in send_iterate_prop (zhp=0x15c0480, nv=0x15c1880)
    at lib/libzfs/libzfs_sendrecv.c:229
	propname = 0x15c1f80 "createtxg"
	prop = 4294967295
	propnv = (nvlist_t *) 0x15bf710
	elem = (nvpair_t *) 0x15c1f70
	__PRETTY_FUNCTION__ = "send_iterate_prop"
#2  0x0000000000422f06 in send_iterate_fs (zhp=0x15c0480, arg=0x7fff9c53a210)
    at lib/libzfs/libzfs_sendrecv.c:288
	sd = (send_data_t *) 0x7fff9c53a210
	nvfs = (nvlist_t *) 0x15c17b0
	nv = (nvlist_t *) 0x15c1880
	rv = 0
	parent_fromsnap_guid_save = 0
	guid = 1520342445465404853
	guidstring = " ¢S\234\000\000\000\000дd\000\000\000\000\000\000\000\000\000\001\000\000\000 ¢S\234ÿ\177\000\000EÊS\234ÿ\177\000\0000\027\\\001\000\000\000\000À¡S\234ÿ\177\000\000ȺB\000\000\000\000"
	__PRETTY_FUNCTION__ = "send_iterate_fs"
#3  0x000000000042317b in gather_nvlist (hdl=0x15bc7f0, 
    fsname=0x15bdfd8 "Backups", fromsnap=0x0, tosnap=0x7fff9c53ca45 "today", 
    nvlp=0x7fff9c53a2d0, avlp=0x7fff9c53a2c8)
    at lib/libzfs/libzfs_sendrecv.c:330
	zhp = (zfs_handle_t *) 0x15c0480
	sd = {parent_fromsnap_guid = 0, parent_snaps = 0x0, fss = 0x15c1760, 
  fromsnap = 0x0, tosnap = 0x7fff9c53ca45 "today"}
	error = 0
	__PRETTY_FUNCTION__ = "gather_nvlist"
#4  0x0000000000424145 in zfs_send (zhp=0x15bdfd0, fromsnap=0x0, 
    tosnap=0x7fff9c53ca45 "today", replicate=B_TRUE, doall=B_TRUE, 
    fromorigin=B_FALSE, verbose=B_FALSE, outfd=1)
    at lib/libzfs/libzfs_sendrecv.c:704
	hdrnv = (nvlist_t *) 0x15bf2f0
	drr = {drr_type = DRR_BEGIN, drr_payloadlen = 0, drr_u = {drr_begin = {
      drr_magic = 0, drr_version = 0, drr_creation_time = 0, 
      drr_type = DMU_OST_NONE, drr_flags = 0, drr_toguid = 0, 
      drr_fromguid = 0, drr_toname = '\0' <repeats 255 times>}, drr_end = {
      drr_checksum = {zc_word = {0, 0, 0, 0}}}, drr_object = {drr_object = 0, 
      drr_type = DMU_OT_NONE, drr_bonustype = DMU_OT_NONE, drr_blksz = 0, 
      drr_bonuslen = 0, drr_checksum = 0 '\0', drr_compress = 0 '\0', 
      drr_pad = "\000\000\000\000\000"}, drr_freeobjects = {drr_firstobj = 0, 
      drr_numobjs = 0}, drr_write = {drr_object = 0, drr_type = DMU_OT_NONE, 
      drr_pad = 0, drr_offset = 0, drr_length = 0}, drr_free = {
      drr_object = 0, drr_offset = 0, drr_length = 0}}}
	packbuf = 0x0
	buflen = 0
	zc = {zc_word = {0, 0, 0, 0}}
	errbuf = "cannot send 'Backups'\000\000\000ÐÔ[\001", '\0' <repeats 12 times>, "\020¥S\234ÿ\177\000\000\001\000\000\000\000\000\000\000ó¤S\234ÿ\177\000\000\030\000\000\0000\000\000\000p¦S\234ÿ\177\000\000°¥S\234ÿ\177\000\000Ø\221Ç\223ð\177\000\000\000\000\000\000\000\000\000\000 \231Ç\000\000\000\000\000 ß[\001\000\000\000\000\017", '\0' <repeats 11 times>, "øÿÿÿÿÿÿÿ\000\000\000\000øÿÿÿ\000\000\000\000@Õ[\001\000\000\000\000ÿÿÿÿ\000\000\000\000\r\2062\224ð\177\000\000\a\000\000\000\000\000\000\000@ªQ\224ð\177\000\000\001\000\000\000\000\000\000\000\006\000\000"...
	sdd = {fromsnap = 0x0, tosnap = 0x0, 
  lastsnap = '\0' <repeats 255 times>, seenfrom = B_FALSE, seento = B_FALSE, 
  replicate = B_FALSE, doall = B_FALSE, fromorigin = B_FALSE, 
  verbose = B_FALSE, outfd = 0, err = B_FALSE, fss = 0x0, fsavl = 0x0}
	err = 0
	fss = (nvlist_t *) 0x0
	fsavl = (avl_tree_t *) 0x0
	__PRETTY_FUNCTION__ = "zfs_send"
#5  0x000000000040755e in zfs_do_send (argc=1, argv=0x7fff9c53ada0)
    at cmd/zfs/zfs_main.c:2346
	fromname = 0x0
	toname = 0x7fff9c53ca45 "today"
	cp = 0x7fff9c53ca44 ""
	zhp = (zfs_handle_t *) 0x15bdfd0
	doall = B_TRUE
	replicate = B_TRUE
	fromorigin = B_FALSE
	verbose = B_FALSE
	c = -1
	err = -1672237696
#6  0x000000000040b5ac in main (argc=4, argv=0x7fff9c53ad88)
    at cmd/zfs/zfs_main.c:4064
	ret = 0
	i = 21
	progname = 0x7fff9c53ca31 "zfs"
	cmdname = 0x7fff9c53ca35 "send"
	__PRETTY_FUNCTION__ = "main"