Public bug reported:

Series: Focal
Kernel: 5.4.0-11.14
Problem:  Kernel Fails to boot on arm64 hardware.

During preliminary the following failure was observed in a VM after the
-proposed kernel was installed from ppa:canonical-kernel-team/proposed


autopkgtest login: [   44.923688] kernel BUG at arch/arm64/kernel/traps.c:406!
[   44.925735] Internal error: Oops - BUG: 0 [#1] SMP
[   44.927059] Modules linked in: iptable_mangle xt_TCPMSS xt_tcpudp bpfilter 
dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua crct10dif_ce ofpart redboot 
cmdlinepart cfi_cmdset_0001 cfi_probe cfi_util gen_probe physmap qemu_fw_cfg 
uio_pdrv_genirq uio map_funcs chipreg mtd sch_fq_codel ip_tables x_tables 
autofs4 btrfs blake2b_generic xor xor_neon zstd_compress raid6_pq libcrc32c 
virtio_net net_failover virtio_blk failover
[   44.943611] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 5.5.0-4-snapdragon 
#5-Ubuntu
[   44.948138] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
[   44.951579] pstate: 00400005 (nzcv daif +PAN -UAO)
[   44.953905] pc : do_undefinstr+0x60/0x68
[   44.955836] lr : do_undefinstr+0x34/0x68
[   44.957695] sp : ffff800010013550
[   44.959644] x29: ffff800010013550 x28: ffff0001fd173c00 
[   44.962107] x27: 0000000000000000 x26: 00000000c642935b 
[   44.964652] x25: 0000000000000000 x24: ffff80001001379c 
[   44.966750] x23: 0000000080400005 x22: ffff800010cdc2f8 
[   44.968930] x21: 0000000041573000 x20: 0000ffffffffffff 
[   44.970885] x19: ffff800010013580 x18: 0000000000001400 
[   44.973300] x17: 0000000000001c00 x16: 0000000000001000 
[   44.975899] x15: 0000000000000c00 x14: 0000000000000000 
[   44.978497] x13: 00000000000001d8 x12: ffff0001ec755428 
[   44.981178] x11: 0000503e00002aa6 x10: 0000000000000000 
[   44.983809] x9 : ffff80001036b4d0 x8 : 0000000000000000 
[   44.986435] x7 : ffff0001fd174128 x6 : ffff800010013548 
[   44.988607] x5 : 0000000000000000 x4 : ffff800011f5e100 
[   44.990548] x3 : ffff800011cf5f10 x2 : db67b15ed7685100 
[   44.992687] x1 : 0000000000000000 x0 : 0000000080400005 
[   44.994456] Call trace:
[   44.995286]  do_undefinstr+0x60/0x68
[   44.996622]  el1_sync_handler+0x8c/0xd8
[   44.998434]  el1_sync+0xb4/0x180
[   44.999604]  e843419@0b9d_0001182e_66f8+0x0/0xff8
[   45.001407]  tcp_ack+0x428/0x940
[   45.002578]  tcp_rcv_established+0x174/0x6b0
[   45.003984]  tcp_v4_do_rcv+0x168/0x250
[   45.005235]  tcp_v4_rcv+0xb9c/0xd08
[   45.006437]  ip_protocol_deliver_rcu+0x44/0x200
[   45.008109]  ip_local_deliver_finish+0x54/0x68
[   45.009492]  ip_local_deliver+0x104/0x110
[   45.010596]  ip_sublist_rcv_finish+0x48/0x68
[   45.011732]  ip_sublist_rcv+0x174/0x1e8
[   45.012707]  ip_list_rcv+0x108/0x168
[   45.013561]  __netif_receive_skb_list_core+0x18c/0x220
[   45.014832]  netif_receive_skb_list_internal+0x194/0x2a0
[   45.016207]  gro_normal_list.part.0+0x24/0x40
[   45.017548]  napi_gro_receive+0x1bc/0x1d8
[   45.018773]  receive_buf+0x1d4/0x498 [virtio_net]
[   45.019967]  virtnet_poll+0x168/0x6f8 [virtio_net]
[   45.021161]  net_rx_action+0x178/0x460
[   45.022087]  __do_softirq+0x130/0x32c
[   45.023019]  irq_exit+0xa0/0xc8
[   45.023796]  __handle_domain_irq+0x6c/0xc0
[   45.024805]  gic_handle_irq+0x58/0xa8
[   45.025692]  el1_irq+0x104/0x1c0
[   45.026488]  arch_cpu_idle+0x38/0x1c8
[   45.027412]  default_idle_call+0x20/0x40
[   45.028361]  do_idle+0x20c/0x2b0
[   45.029184]  cpu_startup_entry+0x28/0x68
[   45.030146]  secondary_start_kernel+0x154/0x1e0
[   45.031275] Code: 97ffffb6 f9400bf3 a8c27bfd d65f03c0 (d4210000) 
[   45.032751] ---[ end trace b0983b157b7a3c23 ]---
[   45.033868] Kernel panic - not syncing: Fatal exception in interrupt
[   45.035609] SMP: stopping secondary CPUs
[   45.036876] Kernel Offset: disabled
[   45.037966] CPU features: 0x00000,20802000
[   45.039153] Memory Limit: none
[   45.039952] ---[ end Kernel panic - not syncing: Fatal exception in 
interrupt ]---


Focal was deployed on a Hisilicon D05, After installing the kernel on bare 
metal there were no console logs after the EFI Boot Stub

Booting local disk...             [ grub.cfg-02:0f:b7:04  527B  100%  2.25B/s ]
EFI stub: Booting Linux Kernel...    [ grubaa64.efi  1.70MiB  100%  7.45KiB/s ]
EFI stub: EFI_RNG_PROTOCOL unavailable, no randomness supplied
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services and installing virtual address map...

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1860144

Title:
  linux 5.4.0-11 fails to boot on arm64

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