After updating to the latest MT76 driver (2018-11-28) I get a Kernel Panic for the MT7612. It happens on two different devices (MT7621 and MT7628 based.)
[ 12.060171] procd: - watchdog -
[ 12.725821] procd: - watchdog -
[ 12.729283] procd: - ubus -
[ 12.886561] procd: - init -
Please press Enter to activate this console.
[ 13.244995] kmodloader: loading kernel modules from /etc/modules.d/*
[ 13.262311] device-mapper: ioctl: 4.37.0-ioctl (2017-09-20) initialised: dm-m
[ 13.280266] Initializing XFRM netlink socket
[ 13.286433] NET: Registered protocol family 15
[ 13.292754] tun: Universal TUN/TAP device driver, 1.6
[ 13.308619] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 13.322428] cryptodev: driver 1.9 loaded.
[ 13.329380] Loading modules backported from Linux version v4.19-rc5-0-g6bf4c5
[ 13.337051] Backport generated by backports.git v4.19-rc5-1-0-g05571dcd
[ 13.345754] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 13.358691] nf_conntrack version 0.5.0 (8192 buckets, 32768 max)
[ 13.407326] xt_time: kernel timezone is -0000
[ 13.459990] bus=0x2, slot = 0x1, irq=0xff
[ 13.464224] mt7603e 0000:02:00.0: ASIC revision: 76030010
[ 13.478390] mt7603e 0000:02:00.0: Firmware Version: ap_pcie
[ 13.483962] mt7603e 0000:02:00.0: Build Time: 20160107100755
[ 13.525645] mt7603e 0000:02:00.0: firmware init done
[ 13.761061] bus=0x1, slot = 0x0, irq=0xff
[ 13.765351] mt76x2e 0000:01:00.0: ASIC revision: 76120044
[ 14.474522] mt76x2e 0000:01:00.0: ROM patch build: 20141115060606a
[ 14.488122] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[ 14.493603] mt76x2e 0000:01:00.0: Build: 1
[ 14.497770] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[ 14.525655] mt76x2e 0000:01:00.0: Firmware running!
[ 14.580671] PPP generic driver version 2.4.2
[ 14.586990] NET: Registered protocol family 24
[ 14.594418] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 22.331066] mtk_soc_eth 1e100000.ethernet: PPE started
[ 22.343451] br-lan: port 1(eth0.1) entered blocking state
[ 22.348932] br-lan: port 1(eth0.1) entered disabled state
[ 22.355018] device eth0.1 entered promiscuous mode
[ 22.359927] device eth0 entered promiscuous mode
[ 22.368683] br-lan: port 1(eth0.1) entered blocking state
[ 22.374105] br-lan: port 1(eth0.1) entered forwarding state
[ 22.380155] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[ 23.356351] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[ 24.136672] CPU 3 Unable to handle kernel paging request at virtual address 4
[ 24.147334] Oops[#1]:
[ 24.149655] CPU: 3 PID: 1567 Comm: hostapd Not tainted 4.14.82 #0
[ 24.155772] task: 8fe0b840 task.stack: 8e490000
[ 24.160309] $ 0 : 00000000 00000001 ffffffff fffffffe
[ 24.165545] $ 4 : 8f751560 8e45fc40 00000000 8e45fd70
[ 24.170782] $ 8 : 00000001 00007c00 811ffca0 00000f03
[ 24.176034] $12 : 00000000 50230008 ffffffff 40000000
[ 24.181294] $16 : 8e45f480 8e45f000 8f750bc0 8e45f480
[ 24.186523] $20 : 00000001 8e45f75c ffffffff 00000000
[ 24.191733] $24 : 0fe20200 8000ceec
[ 24.196947] $28 : 8e490000 8e491d10 7fcac3f8 8ec03464
[ 24.202159] Hi : 0000000a
[ 24.205020] Lo : 66666669
[ 24.207929] epc : 8ece0654 mt76x02_add_interface+0x6c/0x88 [mt76x02_lib]
[ 24.214915] ra : 8ec03464 drv_add_interface+0x7c/0x94 [mac80211]
[ 24.221163] Status: 11007c03 KERNEL EXL IE
[ 24.225341] Cause : 4080000c (ExcCode 03)
[ 24.229328] BadVA : 00000018
[ 24.232192] PrId : 0001992f (MIPS 1004Kc)
[ 24.236264] Modules linked in: pppoe ppp_async pppox ppp_generic nf_conntracr
[ 24.307107] xfrm_ipcomp xfrm_algo dm_crypt dm_mirror dm_region_hash dm_log n
[ 24.326642] Process hostapd (pid: 1567, threadinfo=8e490000, task=8fe0b840, )
[ 24.334775] Stack : 00000000 00000000 8f750bc0 8e45f000 8f750bc0 8ec03464 8f8
[ 24.343109] 8e45f000 8f750bc0 8e45f488 8ec18290 8e45f000 00001003 8e0
[ 24.351445] 8e45f000 8e45f030 8ec5f318 00000000 00000000 00008914 800
[ 24.359781] 7fcac3f8 8034e534 00000000 00000000 0000000c 8e491ee8 8e0
[ 24.368117] 8e45f000 00001003 00000001 8034e87c 8e491ee8 7fcac114 000
[ 24.376452] ...
[ 24.378894] Call Trace:
[ 24.381343] [<8ece0654>] mt76x02_add_interface+0x6c/0x88 [mt76x02_lib]
[ 24.387892] [<8ec03464>] drv_add_interface+0x7c/0x94 [mac80211]
[ 24.393831] [<8ec18290>] ieee80211_do_open+0x3a4/0x9e8 [mac80211]
[ 24.400012] [<8034e534>] __dev_open+0xdc/0x14c
[ 24.404446] [<8034e87c>] __dev_change_flags+0xe8/0x1b0
[ 24.409563] [<8034e96c>] dev_change_flags+0x28/0x70
[ 24.414421] [<803c7f84>] devinet_ioctl+0x2f8/0x884
[ 24.419221] [<8032a4e0>] sock_ioctl+0x2fc/0x358
[ 24.423753] [<80126e58>] do_vfs_ioctl+0x774/0x81c
[ 24.428439] [<80126f50>] SyS_ioctl+0x50/0xa0
[ 24.432706] [<80019578>] syscall_common+0x34/0x58
[ 24.437392] Code: 24a70130 a0a20185 a0a30184 <acc70018> 0fddcc4d 8ca50120
[ 24.447122]
[ 24.449154] ---[ end trace 55ea9016a9fb29d4 ]---
[ 24.455679] Kernel panic - not syncing: Fatal exception
[ 24.462439] Rebooting in 3 seconds..