I was under the impression that specifying lanX.X would implicitly create a tagged VLAN, but I got a crash in this case: what am I doing wrong?
option ifname 'lan0.1 lan1.2 lan2.3 lan3.4 lan4'
[ 12.611835] Process netifd (pid: 2325, stack limit = 0x079ef63d)
[ 12.617853] Stack: (0xed2abc10 to 0xed2ac000)
[ 12.622219] bc00: ed2abc9c ed2abc74 00000000 00000000
[ 12.630416] bc20: eebc9800 c06b4ac4 00000002 ffff8fa8 ed4d2800 ffffffa1 ed2abc9c ed2abc74
[ 12.638612] bc40: ed2abc4c c06b4af4 00000400 ed4d2868 ed2abc74 ed05c640 ed4d2800 ed2abc9c
[ 12.646809] bc60: 00000001 c06b4ba4 ee14d580 eedd8080 cdb66693 ed2abc74 ed2abc74 00000001
[ 12.655005] bc80: 00000000 ed05c640 ed05c640 ed190a00 00000001 c06aa5c8 cdb65d36 ed4d2800
[ 12.663201] bca0: 00000001 00000000 00000000 00000000 00010006 00000001 eea78b00 c06a7d6c
[ 12.671398] bcc0: ee14d500 00000006 ed4d2800 c014e080 c0701cac eedd8040 eedd8040 eea78ee0
[ 12.679594] bce0: 00000000 c014892c eea78a80 c0948040 ed2abd1c c01489a8 eea78a80 eedd8040
[ 12.687789] bd00: eea78a80 c0948040 eedd8040 eea78ee0 00000000 c0a03db0 ed2abd54 c0149234
[ 12.695986] bd20: ee1a2400 a0000013 00000010 00000000 ed2abdcc eea78ee4 eea78a84 eea78a80
[ 12.704182] bd40: 00000001 00000000 ed190a80 c084c4f8 ed2abd74 c01492c0 eea8a04c ed2abd78
[ 12.712379] bd60: eea8a04c 00000000 ed2abdcc ed190a80 0003dcf4 ed44fc00 ed05c640 00000000
[ 12.720575] bd80: ed190a00 00000001 c06a6390 ed2abe1b ed2abdae c06a8cac ed2abe1c ee801d80
[ 12.728771] bda0: 00000006 c0a64d58 00000000 00010002 ed44fc00 ed2abdae 00020003 00000008
[ 12.736968] bdc0: 00001000 01010000 00000000 00000000 c06a6390 00020003 00000008 00001000
[ 12.745164] bde0: 01010000 00000000 00000000 c06a6390 00000000 c0a03c48 00000000 00000000
[ 12.753361] be00: ed190a00 ed44fc00 ed190a80 c084c4f8 0003dcf4 c06a8dd0 00c3fd00 edc3f800
[ 12.761557] be20: 00000007 00000002 00000000 00000000 00000000 00000000 00000000 00000000
[ 12.769753] be40: 00000000 00000000 00000000 00000000 00000000 e66e53bf 00000000 edc3fd00
[ 12.777949] be60: 00000000 ed4d2800 ed190a00 c0698180 00000000 c012eae4 000089a2 edc3f800
[ 12.786146] be80: ed2abeec c073e12c 00000000 00000000 00000036 c05c1574 ffffff9c 00000000
[ 12.794342] bea0: 00000001 c0598134 ed2abeec c0a2ff00 000089a2 ed2abee4 00000000 c05c1ba8
[ 12.802539] bec0: 000089a2 c0a03c48 00000051 be94bb18 c0a2ff00 ffffe000 00000036 c057d000
[ 12.810735] bee0: 00000000 00000001 00002574 6c2d7262 00006e61 00000000 00000000 0000000f
[ 12.818931] bf00: 00000000 00000000 00000000 e66e53bf 000007ff be94bb18 ee4d9520 ed1600c0
[ 12.827127] bf20: 000089a2 be94bb18 ed2aa000 c02346bc 00000000 ee4ffdd0 ffffffff ee8b9480
[ 12.835324] bf40: 00000000 ee55d800 ee4ffdd0 ee290710 40000010 ee8b9488 0000002f c0223098
[ 12.843520] bf60: 00000020 00000000 ee14d944 ee14d500 ed1600c0 ed1600c0 00000008 000089a2
[ 12.851716] bf80: be94bb18 ed2aa000 00000036 c0234760 b6ec33b0 000089a2 b6eae118 00000036
[ 12.859913] bfa0: c0101204 c0101000 b6ec33b0 000089a2 00000008 000089a2 be94bb18 be94bb10
[ 12.868109] bfc0: b6ec33b0 000089a2 b6eae118 00000036 b6ec33e8 b6eae118 b6e95874 0003dcf4
[ 12.876305] bfe0: 0003cd58 be94baf8 00022b34 b6f0cb48 80000010 00000008 00000000 00000000
[ 12.884506] [<c06a6448>] (br_vlan_enabled) from [<c06ac178>] (dsa_port_vlan_add+0x40/0x88)
[ 12.892795] [<c06ac178>] (dsa_port_vlan_add) from [<c06b4ac4>] (__switchdev_port_obj_add+0x30/0x94)
[ 12.901863] [<c06b4ac4>] (__switchdev_port_obj_add) from [<c06b4af4>] (__switchdev_port_obj_add+0x60/0x94)
[ 12.911540] [<c06b4af4>] (__switchdev_port_obj_add) from [<c06b4ba4>] (switchdev_port_obj_add_now+0x7c/0xf0)
[ 12.921391] [<c06b4ba4>] (switchdev_port_obj_add_now) from [<c06aa5c8>] (br_switchdev_port_vlan_add+0x40/0x48)
[ 12.931417] [<c06aa5c8>] (br_switchdev_port_vlan_add) from [<c06a7d6c>] (__vlan_add+0x58/0x7d4)
[ 12.940136] [<c06a7d6c>] (__vlan_add) from [<c06a8cac>] (nbp_vlan_add+0x208/0x234)
[ 12.947723] [<c06a8cac>] (nbp_vlan_add) from [<c06a8dd0>] (nbp_vlan_init+0xf8/0x14c)
[ 12.955485] [<c06a8dd0>] (nbp_vlan_init) from [<c0698180>] (br_add_if+0x3d0/0x5ac)
[ 12.963075] [<c0698180>] (br_add_if) from [<c05c1574>] (dev_ifsioc+0x2e0/0x314)
[ 12.970402] [<c05c1574>] (dev_ifsioc) from [<c05c1ba8>] (dev_ioctl+0x54c/0x5bc)
[ 12.977733] [<c05c1ba8>] (dev_ioctl) from [<c057d000>] (sock_ioctl+0x4c0/0x4f0)
[ 12.985064] [<c057d000>] (sock_ioctl) from [<c02346bc>] (do_vfs_ioctl+0x86c/0x8dc)
[ 12.992653] [<c02346bc>] (do_vfs_ioctl) from [<c0234760>] (ksys_ioctl+0x34/0x58)
[ 13.000067] [<c0234760>] (ksys_ioctl) from [<c0101000>] (ret_fast_syscall+0x0/0x54)
[ 13.007739] Exception stack(0xed2abfa8 to 0xed2abff0)
[ 13.012801] bfa0: b6ec33b0 000089a2 00000008 000089a2 be94bb18 be94bb10
[ 13.020998] bfc0: b6ec33b0 000089a2 b6eae118 00000036 b6ec33e8 b6eae118 b6e95874 0003dcf4
[ 13.029193] bfe0: 0003cd58 be94baf8 00022b34 b6f0cb48
[ 13.034257] Code: e1d200ba e050000c 13a00001 e8bd8010 (e5d00518)
[ 13.040388] ---[ end trace 69c9aec0d6b41e26 ]---
[ 13.045803] Kernel panic - not syncing: Fatal exception
[ 13.051045] CPU1: stopping
[ 13.053761] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G D 4.19.56 #0
[ 13.061173] Hardware name: Marvell Armada 380/385 (Device Tree)
[ 13.067116] [<c010ebac>] (unwind_backtrace) from [<c010ad10>] (show_stack+0x10/0x14)
[ 13.074879] [<c010ad10>] (show_stack) from [<c06b8c50>] (dump_stack+0x88/0x9c)
[ 13.082119] [<c06b8c50>] (dump_stack) from [<c010d984>] (handle_IPI+0xf0/0x19c)
[ 13.089450] [<c010d984>] (handle_IPI) from [<c03db7e4>] (gic_handle_irq+0x8c/0x90)
[ 13.097038] [<c03db7e4>] (gic_handle_irq) from [<c0101a0c>] (__irq_svc+0x6c/0x90)
[ 13.104536] Exception stack(0xee891f68 to 0xee891fb0)
[ 13.109599] 1f60: 00000000 0002cccc eede12c4 c0114520 ffffe000 c0a03c6c
[ 13.117795] 1f80: 00000002 c0a03cac c0947528 00000000 00000000 00000000 2e49c000 ee891fb8
[ 13.125990] 1fa0: c01082f4 c01082f8 60000013 ffffffff
[ 13.131057] [<c0101a0c>] (__irq_svc) from [<c01082f8>] (arch_cpu_idle+0x34/0x38)
[ 13.138475] [<c01082f8>] (arch_cpu_idle) from [<c014d0e8>] (do_idle+0xe4/0x1c8)
[ 13.145801] [<c014d0e8>] (do_idle) from [<c014d428>] (cpu_startup_entry+0x18/0x20)
[ 13.153389] [<c014d428>] (cpu_startup_entry) from [<001023ec>] (0x1023ec)
[ 13.160537] Rebooting in 3 seconds..