[SCALE] SMB very slow and crashes on use

Hey,

I just switch to SCALE Nightlies (TrueNAS-SCALE-20.11-MASTER-20201103-132915) from 12.1 Nightlies.

I noticed that under SCALE, SMB is very slow and somewhat unstable. If I copy larger files (or just overall) the connection will crash and I get these dumps in the CLI:

truenas# 2020 Nov 4 00:54:16 truenas Process 3203149 (smbd) of user 0 dumped co re.

Stack trace of thread 3203149:
#0 0x00007fc93e6b9db1 __GI_raise (libc.so.6 + 0x3bdb1)
#1 0x00007fc93e6a3537 __GI_abort (libc.so.6 + 0x25537)
#2 0x00007fc93eb8d610 dump_core (libsmbconf.so.0 + 0x3b610)
#3 0x00007fc93eb837c1 smb_panic_s3 (libsmbconf.so.0 + 0x317c1)
#4 0x00007fc93ec1a757 smb_panic (libsamba-util.so.0 + 0x21757)
#5 0x00007fc93ee84e02 n/a (libsmbd-base.so.0 + 0x208e02)
#6 0x00007fc93eab48e6 n/a (libtalloc.so.2 + 0x48e6)
#7 0x00007fc93edabdce n/a (libsmbd-base.so.0 + 0x12fdce)
#8 0x00007fc93edad5f2 n/a (libsmbd-base.so.0 + 0x1315f2)
#9 0x00007fc93edb0e3d create_file_default (libsmbd-base.so.0 + 0x134e3d)
#10 0x00007fc93edea515 smbd_smb2_request_process_create (libsmbd-base.so.0 + 0x1 6e515)
#11 0x00007fc93ede049d smbd_smb2_request_dispatch (libsmbd-base.so.0 + 0x16449d)
#12 0x00007fc93ede1dc7 n/a (libsmbd-base.so.0 + 0x165dc7)
#13 0x00007fc93e91f10d tevent_common_invoke_fd_handler (libtevent.so.0 + 0x710d)
#14 0x00007fc93e925497 n/a (libtevent.so.0 + 0xd497)
#15 0x00007fc93e923617 n/a (libtevent.so.0 + 0xb617)
#16 0x00007fc93e91e7b4 _tevent_loop_once (libtevent.so.0 + 0x67b4)
#17 0x00007fc93e91ea9b tevent_common_loop_wait (libtevent.so.0 + 0x6a9b)
#18 0x00007fc93e9235b7 n/a (libtevent.so.0 + 0xb5b7)
#19 0x00007fc93edceba0 smbd_process (libsmbd-base.so.0 + 0x152ba0)
#20 0x000055aef6763d85 n/a (smbd + 0xcd85)
#21 0x00007fc93e91f10d tevent_common_invoke_fd_handler (libtevent.so.0 + 0x710d)
#22 0x00007fc93e925497 n/a (libtevent.so.0 + 0xd497)
#23 0x00007fc93e923617 n/a (libtevent.so.0 + 0xb617)
#24 0x00007fc93e91e7b4 _tevent_loop_once (libtevent.so.0 + 0x67b4)
#25 0x00007fc93e91ea9b tevent_common_loop_wait (libtevent.so.0 + 0x6a9b)
#26 0x00007fc93e9235b7 n/a (libtevent.so.0 + 0xb5b7)
#27 0x000055aef675fb61 main (smbd + 0x8b61)
#28 0x00007fc93e6a4cca __libc_start_main (libc.so.6 + 0x26cca)
#29 0x000055aef675fdba _start (smbd + 0x8dba)