Public bug reported:

image: 18.04.5 daily image (20200806.1) bionic-live-server-arm64.iso
kernel: 4.15.0-112-generic #113-Ubuntu
platform: Hisilicon D06 arm64 arch

[Reproducing Steps]
1. setup pxe boot by following 
https://discourse.ubuntu.com/t/netbooting-the-live-server-installer/14510
2. pxe boot the machine with the image

[Expected Result]
Boot to subiquity

[Actual Result]
Kernel trace happened during booting process.

[    8.375118] md: ... autorun DONE.
[    8.378478] VFS: Cannot open root device "(null)" or unknown-block(0,0): 
error -6
[    8.385955] Please append a correct "root=" boot option; here are the 
available partitions:
[    8.394303] Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)
[    8.402554] CPU: 32 PID: 1 Comm: swapper/0 Not tainted 4.15.0-112-generic 
#113-Ubuntu
[    8.410369] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - 
V1.20.01 04/26/2019
[    8.418879] Call trace:
[    8.421316]  dump_backtrace+0x0/0x198
[    8.424965]  show_stack+0x24/0x30
[    8.428269]  dump_stack+0x98/0xbc
[    8.431572]  panic+0x128/0x2a4
[    8.434615]  mount_block_root+0x210/0x2e8
[    8.438610]  mount_root+0x7c/0x8c
[    8.441912]  prepare_namespace+0x144/0x1dc
[    8.445995]  kernel_init_freeable+0x218/0x23c
[    8.450341]  kernel_init+0x18/0x110
[    8.453817]  ret_from_fork+0x10/0x18
[    8.457486] SMP: stopping secondary CPUs
[    8.461836] Kernel Offset: disabled
[    8.465312] CPU features: 0x03200a38
[    8.468873] Memory Limit: none
[    8.473291] Unable to handle kernel paging request at virtual address 
ffff000009865034
[    8.481192] Mem abort info:
[    8.483972]   ESR = 0x96000061
[    8.487013]   Exception class = DABT (current EL), IL = 32 bits
[    8.492918]   SET = 0, FnV = 0
[    8.495958]   EA = 0, S1PTW = 0
[    8.499086] Data abort info:
[    8.501953]   ISV = 0, ISS = 0x00000061
[    8.505774]   CM = 0, WnR = 1
[    8.508729] swapper pgtable: 4k pages, 48-bit VAs, pgd =         (ptrval)
[    8.515502] [ffff000009865034] *pgd=00000a5fffffe003, *pud=00000a5fffffd003, 
*pmd=00000a5fffff7003, *pte=0068000094110703
[    8.526445] Internal error: Oops: 96000061 [#1] SMP
[    8.531310] Modules linked in:
[    8.534351] Process swapper/0 (pid: 1, stack limit = 0x        (ptrval))
[    8.541039] CPU: 32 PID: 1 Comm: swapper/0 Not tainted 4.15.0-112-generic 
#113-Ubuntu
[    8.548854] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - 
V1.20.01 04/26/2019
[    8.557363] pstate: 60800089 (nZCv daIf -PAN +UAO)
[    8.562144] pc : acpi_os_write_memory+0xac/0x158
[    8.566749] lr : apei_write+0xb0/0xc0
[    8.570397] sp : ffff000009afb900
[    8.573698] x29: ffff000009afb900 x28: 00000000fffffffe 
[    8.578996] x27: 00000000ffffffff x26: 00000000ffffffa5 
[    8.584294] x25: 00000000ffffffbe x24: 0000000000000080 
[    8.589592] x23: 0000000000000005 x22: 0000000000000008 
[    8.594890] x21: 0000000000000040 x20: 0000000000000010 
[    8.600188] x19: 0000000094110034 x18: 0000000000000003 
[    8.605486] x17: 0000000000000000 x16: 0000000000000009 
[    8.610784] x15: 000000000000001f x14: 8205169d4225fc6e 
[    8.616082] x13: 34650f577629d387 x12: 9c021ee3f3d0bcca 
[    8.621380] x11: b1ae83ff50c19148 x10: b6b91ab42ae87562 
[    8.626678] x9 : f469cb78cb1add9d x8 : a16fcb806efa3dd5 
[    8.631976] x7 : 0000000000000001 x6 : 0000000094110034 
[    8.637274] x5 : 000000009411003c x4 : ffff000009639fb8 
[    8.642571] x3 : 0000000000000000 x2 : 0000000000000034 
[    8.647869] x1 : 0000000000000010 x0 : ffff000009865034 
[    8.653167] Call trace:
[    8.655601]  acpi_os_write_memory+0xac/0x158
[    8.659858]  apei_write+0xb0/0xc0
[    8.663160]  __apei_exec_write_register+0x88/0xb0
[    8.667851]  apei_exec_write_register_value+0x2c/0x38
[    8.672888]  __apei_exec_run+0xac/0x108
[    8.676711]  erst_write+0x154/0x268
[    8.680186]  erst_writer+0x26c/0x3b0
[    8.683751]  pstore_dump+0x1b4/0x330
[    8.687313]  kmsg_dump+0xd0/0x100
[    8.690615]  panic+0x164/0x2a4
[    8.693656]  mount_block_root+0x210/0x2e8
[    8.697652]  mount_root+0x7c/0x8c
[    8.700953]  prepare_namespace+0x144/0x1dc
[    8.705035]  kernel_init_freeable+0x218/0x23c
[    8.709380]  kernel_init+0x18/0x110
[    8.712855]  ret_from_fork+0x10/0x18
[    8.716418] Code: 54000380 710102bf 54000561 d5033e9f (f9000014) 
[    8.722499] ---[ end trace 8cc2af9c56a59f43 ]---
[   38.738914] WARNING: CPU: 32 PID: 9 at 
/build/linux-WMG2fK/linux-4.15.0/kernel/irq_work.c:102 
irq_work_queue_on+0xd4/0xe8
[   38.749854] Modules linked in:
[   38.752897] CPU: 32 PID: 9 Comm: rcu_sched Tainted: G      D          
4.15.0-112-generic #113-Ubuntu
[   38.762014] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - 
V1.20.01 04/26/2019
[   38.770524] pstate: 60c00089 (nZCv daIf +PAN +UAO)
[   38.775302] pc : irq_work_queue_on+0xd4/0xe8
[   38.779560] lr : rcu_implicit_dynticks_qs+0x224/0x2c8
[   38.784597] sp : ffff000009bebd20
[   38.787897] x29: ffff000009bebd20 x28: ffff0000095b3b80 
[   38.793196] x27: 0000000000000000 x26: 0000000000000000 
[   38.798494] x25: ffff000008164980 x24: ffff000009588e40 
[   38.803792] x23: 0000000000000001 x22: ffff0000095896a8 
[   38.809090] x21: 0000000000001d4e x20: ffff0000095b3b80 
[   38.814388] x19: 0000000000000000 x18: ffffffffffffffff 
[   38.819686] x17: 0000000000000000 x16: 0000000000000009 
[   38.824984] x15: ffff000009588c08 x14: ffff00008974ace7 
[   38.830282] x13: ffff00000974acf5 x12: ffff0000095b0000 
[   38.835580] x11: 0000000005f5e0ff x10: 0000000000000b00 
[   38.840878] x9 : ffff000009bebc70 x8 : 0000803f76a74000 
[   38.846176] x7 : 0000000000000019 x6 : 0000000000000001 
[   38.851474] x5 : ffff000009586000 x4 : ffff803f7fbb6be0 
[   38.856771] x3 : ffff000009589668 x2 : 0000000000000000 
[   38.862069] x1 : 0000000000000000 x0 : 0000000100000000 
[   38.867368] Call trace:
[   38.869802]  irq_work_queue_on+0xd4/0xe8
[   38.873712]  rcu_implicit_dynticks_qs+0x224/0x2c8
[   38.878403]  force_qs_rnp+0xe4/0x190
[   38.881965]  rcu_gp_kthread+0x514/0x7e8
[   38.885789]  kthread+0x134/0x138
[   38.889005]  ret_from_fork+0x10/0x18
[   38.892566] ---[ end trace 8cc2af9c56a59f44 ]---
[   41.294908] WARNING: CPU: 32 PID: 0 at 
/build/linux-WMG2fK/linux-4.15.0/kernel/sched/core.c:1213 
set_task_cpu+0x1a0/0x1a8
[   41.305847] Modules linked in:
[   41.308889] CPU: 32 PID: 0 Comm: swapper/32 Tainted: G      D W        
4.15.0-112-generic #113-Ubuntu
[   41.318093] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - 
V1.20.01 04/26/2019
[   41.326602] pstate: 20400089 (nzCv daIf +PAN -UAO)
[   41.331380] pc : set_task_cpu+0x1a0/0x1a8
[   41.335375] lr : try_to_wake_up+0x16c/0x478
[   41.339544] sp : ffff0000098e3ce0
[   41.342844] x29: ffff0000098e3ce0 x28: 0000000000000002 
[   41.348142] x27: ffff000009588000 x26: 0000000000000021 
[   41.353440] x25: ffff000009141000 x24: ffff803f7a5e0428 
[   41.358738] x23: 0000000000000000 x22: 0000000000000004 
[   41.364036] x21: ffff803f7a5e0814 x20: 0000000000000021 
[   41.369334] x19: ffff803f7a5e0000 x18: ffffffffffffffff 
[   41.374632] x17: 0000000000000000 x16: 0000000000000009 
[   41.379930] x15: ffff000009588c08 x14: 0000000000000028 
[   41.385228] x13: 0000000000000000 x12: 0000000000000000 
[   41.390526] x11: ffff000008b67ba0 x10: 0000000000000001 
[   41.395824] x9 : ffff805f7fc76528 x8 : ffff805f7fc76570 
[   41.401122] x7 : 0000800000000000 x6 : 000000063007eb67 
[   41.406420] x5 : 00ffffffffffffff x4 : 0000000000000015 
[   41.411718] x3 : 0000000000003ec6 x2 : ffff000009589668 
[   41.417017] x1 : ffff000009589000 x0 : 0000000000000000 
[   41.422315] Call trace:
[   41.424748]  set_task_cpu+0x1a0/0x1a8
[   41.428397]  try_to_wake_up+0x16c/0x478
[   41.432219]  wake_up_process+0x28/0x38
[   41.435956]  process_timeout+0x20/0x30
[   41.439691]  call_timer_fn+0x34/0x178
[   41.443340]  expire_timers+0xc8/0x130
[   41.446989]  run_timer_softirq+0xec/0x1b8
[   41.450985]  __do_softirq+0x134/0x330
[   41.454634]  irq_exit+0xcc/0xe0
[   41.457763]  __handle_domain_irq+0x6c/0xc0
[   41.461845]  gic_handle_irq+0x84/0x180
[   41.465580]  el1_irq+0xe8/0x180
[   41.468709]  arch_cpu_idle+0x30/0x180
[   41.472358]  do_idle+0x138/0x1f0
[   41.475574]  cpu_startup_entry+0x2c/0x30
[   41.479484]  secondary_start_kernel+0x114/0x128
[   41.484001] ---[ end trace 8cc2af9c56a59f45 ]---

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

-- 
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https://bugs.launchpad.net/bugs/1890884

Title:
  kernel trace of 18.04.5 daily image (20200806.1) on Hisilicon D06
  arm64 arch

Status in linux package in Ubuntu:
  New

Bug description:
  image: 18.04.5 daily image (20200806.1) bionic-live-server-arm64.iso
  kernel: 4.15.0-112-generic #113-Ubuntu
  platform: Hisilicon D06 arm64 arch

  [Reproducing Steps]
  1. setup pxe boot by following 
https://discourse.ubuntu.com/t/netbooting-the-live-server-installer/14510
  2. pxe boot the machine with the image

  [Expected Result]
  Boot to subiquity

  [Actual Result]
  Kernel trace happened during booting process.

  [    8.375118] md: ... autorun DONE.
  [    8.378478] VFS: Cannot open root device "(null)" or unknown-block(0,0): 
error -6
  [    8.385955] Please append a correct "root=" boot option; here are the 
available partitions:
  [    8.394303] Kernel panic - not syncing: VFS: Unable to mount root fs on 
unknown-block(0,0)
  [    8.402554] CPU: 32 PID: 1 Comm: swapper/0 Not tainted 4.15.0-112-generic 
#113-Ubuntu
  [    8.410369] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - 
V1.20.01 04/26/2019
  [    8.418879] Call trace:
  [    8.421316]  dump_backtrace+0x0/0x198
  [    8.424965]  show_stack+0x24/0x30
  [    8.428269]  dump_stack+0x98/0xbc
  [    8.431572]  panic+0x128/0x2a4
  [    8.434615]  mount_block_root+0x210/0x2e8
  [    8.438610]  mount_root+0x7c/0x8c
  [    8.441912]  prepare_namespace+0x144/0x1dc
  [    8.445995]  kernel_init_freeable+0x218/0x23c
  [    8.450341]  kernel_init+0x18/0x110
  [    8.453817]  ret_from_fork+0x10/0x18
  [    8.457486] SMP: stopping secondary CPUs
  [    8.461836] Kernel Offset: disabled
  [    8.465312] CPU features: 0x03200a38
  [    8.468873] Memory Limit: none
  [    8.473291] Unable to handle kernel paging request at virtual address 
ffff000009865034
  [    8.481192] Mem abort info:
  [    8.483972]   ESR = 0x96000061
  [    8.487013]   Exception class = DABT (current EL), IL = 32 bits
  [    8.492918]   SET = 0, FnV = 0
  [    8.495958]   EA = 0, S1PTW = 0
  [    8.499086] Data abort info:
  [    8.501953]   ISV = 0, ISS = 0x00000061
  [    8.505774]   CM = 0, WnR = 1
  [    8.508729] swapper pgtable: 4k pages, 48-bit VAs, pgd =         (ptrval)
  [    8.515502] [ffff000009865034] *pgd=00000a5fffffe003, 
*pud=00000a5fffffd003, *pmd=00000a5fffff7003, *pte=0068000094110703
  [    8.526445] Internal error: Oops: 96000061 [#1] SMP
  [    8.531310] Modules linked in:
  [    8.534351] Process swapper/0 (pid: 1, stack limit = 0x        (ptrval))
  [    8.541039] CPU: 32 PID: 1 Comm: swapper/0 Not tainted 4.15.0-112-generic 
#113-Ubuntu
  [    8.548854] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - 
V1.20.01 04/26/2019
  [    8.557363] pstate: 60800089 (nZCv daIf -PAN +UAO)
  [    8.562144] pc : acpi_os_write_memory+0xac/0x158
  [    8.566749] lr : apei_write+0xb0/0xc0
  [    8.570397] sp : ffff000009afb900
  [    8.573698] x29: ffff000009afb900 x28: 00000000fffffffe 
  [    8.578996] x27: 00000000ffffffff x26: 00000000ffffffa5 
  [    8.584294] x25: 00000000ffffffbe x24: 0000000000000080 
  [    8.589592] x23: 0000000000000005 x22: 0000000000000008 
  [    8.594890] x21: 0000000000000040 x20: 0000000000000010 
  [    8.600188] x19: 0000000094110034 x18: 0000000000000003 
  [    8.605486] x17: 0000000000000000 x16: 0000000000000009 
  [    8.610784] x15: 000000000000001f x14: 8205169d4225fc6e 
  [    8.616082] x13: 34650f577629d387 x12: 9c021ee3f3d0bcca 
  [    8.621380] x11: b1ae83ff50c19148 x10: b6b91ab42ae87562 
  [    8.626678] x9 : f469cb78cb1add9d x8 : a16fcb806efa3dd5 
  [    8.631976] x7 : 0000000000000001 x6 : 0000000094110034 
  [    8.637274] x5 : 000000009411003c x4 : ffff000009639fb8 
  [    8.642571] x3 : 0000000000000000 x2 : 0000000000000034 
  [    8.647869] x1 : 0000000000000010 x0 : ffff000009865034 
  [    8.653167] Call trace:
  [    8.655601]  acpi_os_write_memory+0xac/0x158
  [    8.659858]  apei_write+0xb0/0xc0
  [    8.663160]  __apei_exec_write_register+0x88/0xb0
  [    8.667851]  apei_exec_write_register_value+0x2c/0x38
  [    8.672888]  __apei_exec_run+0xac/0x108
  [    8.676711]  erst_write+0x154/0x268
  [    8.680186]  erst_writer+0x26c/0x3b0
  [    8.683751]  pstore_dump+0x1b4/0x330
  [    8.687313]  kmsg_dump+0xd0/0x100
  [    8.690615]  panic+0x164/0x2a4
  [    8.693656]  mount_block_root+0x210/0x2e8
  [    8.697652]  mount_root+0x7c/0x8c
  [    8.700953]  prepare_namespace+0x144/0x1dc
  [    8.705035]  kernel_init_freeable+0x218/0x23c
  [    8.709380]  kernel_init+0x18/0x110
  [    8.712855]  ret_from_fork+0x10/0x18
  [    8.716418] Code: 54000380 710102bf 54000561 d5033e9f (f9000014) 
  [    8.722499] ---[ end trace 8cc2af9c56a59f43 ]---
  [   38.738914] WARNING: CPU: 32 PID: 9 at 
/build/linux-WMG2fK/linux-4.15.0/kernel/irq_work.c:102 
irq_work_queue_on+0xd4/0xe8
  [   38.749854] Modules linked in:
  [   38.752897] CPU: 32 PID: 9 Comm: rcu_sched Tainted: G      D          
4.15.0-112-generic #113-Ubuntu
  [   38.762014] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - 
V1.20.01 04/26/2019
  [   38.770524] pstate: 60c00089 (nZCv daIf +PAN +UAO)
  [   38.775302] pc : irq_work_queue_on+0xd4/0xe8
  [   38.779560] lr : rcu_implicit_dynticks_qs+0x224/0x2c8
  [   38.784597] sp : ffff000009bebd20
  [   38.787897] x29: ffff000009bebd20 x28: ffff0000095b3b80 
  [   38.793196] x27: 0000000000000000 x26: 0000000000000000 
  [   38.798494] x25: ffff000008164980 x24: ffff000009588e40 
  [   38.803792] x23: 0000000000000001 x22: ffff0000095896a8 
  [   38.809090] x21: 0000000000001d4e x20: ffff0000095b3b80 
  [   38.814388] x19: 0000000000000000 x18: ffffffffffffffff 
  [   38.819686] x17: 0000000000000000 x16: 0000000000000009 
  [   38.824984] x15: ffff000009588c08 x14: ffff00008974ace7 
  [   38.830282] x13: ffff00000974acf5 x12: ffff0000095b0000 
  [   38.835580] x11: 0000000005f5e0ff x10: 0000000000000b00 
  [   38.840878] x9 : ffff000009bebc70 x8 : 0000803f76a74000 
  [   38.846176] x7 : 0000000000000019 x6 : 0000000000000001 
  [   38.851474] x5 : ffff000009586000 x4 : ffff803f7fbb6be0 
  [   38.856771] x3 : ffff000009589668 x2 : 0000000000000000 
  [   38.862069] x1 : 0000000000000000 x0 : 0000000100000000 
  [   38.867368] Call trace:
  [   38.869802]  irq_work_queue_on+0xd4/0xe8
  [   38.873712]  rcu_implicit_dynticks_qs+0x224/0x2c8
  [   38.878403]  force_qs_rnp+0xe4/0x190
  [   38.881965]  rcu_gp_kthread+0x514/0x7e8
  [   38.885789]  kthread+0x134/0x138
  [   38.889005]  ret_from_fork+0x10/0x18
  [   38.892566] ---[ end trace 8cc2af9c56a59f44 ]---
  [   41.294908] WARNING: CPU: 32 PID: 0 at 
/build/linux-WMG2fK/linux-4.15.0/kernel/sched/core.c:1213 
set_task_cpu+0x1a0/0x1a8
  [   41.305847] Modules linked in:
  [   41.308889] CPU: 32 PID: 0 Comm: swapper/32 Tainted: G      D W        
4.15.0-112-generic #113-Ubuntu
  [   41.318093] Hardware name: Huawei D06 /D06, BIOS Hisilicon D06 UEFI RC0 - 
V1.20.01 04/26/2019
  [   41.326602] pstate: 20400089 (nzCv daIf +PAN -UAO)
  [   41.331380] pc : set_task_cpu+0x1a0/0x1a8
  [   41.335375] lr : try_to_wake_up+0x16c/0x478
  [   41.339544] sp : ffff0000098e3ce0
  [   41.342844] x29: ffff0000098e3ce0 x28: 0000000000000002 
  [   41.348142] x27: ffff000009588000 x26: 0000000000000021 
  [   41.353440] x25: ffff000009141000 x24: ffff803f7a5e0428 
  [   41.358738] x23: 0000000000000000 x22: 0000000000000004 
  [   41.364036] x21: ffff803f7a5e0814 x20: 0000000000000021 
  [   41.369334] x19: ffff803f7a5e0000 x18: ffffffffffffffff 
  [   41.374632] x17: 0000000000000000 x16: 0000000000000009 
  [   41.379930] x15: ffff000009588c08 x14: 0000000000000028 
  [   41.385228] x13: 0000000000000000 x12: 0000000000000000 
  [   41.390526] x11: ffff000008b67ba0 x10: 0000000000000001 
  [   41.395824] x9 : ffff805f7fc76528 x8 : ffff805f7fc76570 
  [   41.401122] x7 : 0000800000000000 x6 : 000000063007eb67 
  [   41.406420] x5 : 00ffffffffffffff x4 : 0000000000000015 
  [   41.411718] x3 : 0000000000003ec6 x2 : ffff000009589668 
  [   41.417017] x1 : ffff000009589000 x0 : 0000000000000000 
  [   41.422315] Call trace:
  [   41.424748]  set_task_cpu+0x1a0/0x1a8
  [   41.428397]  try_to_wake_up+0x16c/0x478
  [   41.432219]  wake_up_process+0x28/0x38
  [   41.435956]  process_timeout+0x20/0x30
  [   41.439691]  call_timer_fn+0x34/0x178
  [   41.443340]  expire_timers+0xc8/0x130
  [   41.446989]  run_timer_softirq+0xec/0x1b8
  [   41.450985]  __do_softirq+0x134/0x330
  [   41.454634]  irq_exit+0xcc/0xe0
  [   41.457763]  __handle_domain_irq+0x6c/0xc0
  [   41.461845]  gic_handle_irq+0x84/0x180
  [   41.465580]  el1_irq+0xe8/0x180
  [   41.468709]  arch_cpu_idle+0x30/0x180
  [   41.472358]  do_idle+0x138/0x1f0
  [   41.475574]  cpu_startup_entry+0x2c/0x30
  [   41.479484]  secondary_start_kernel+0x114/0x128
  [   41.484001] ---[ end trace 8cc2af9c56a59f45 ]---

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