I can see this issue with node wright-kernel with 4.15.0-73 as well.

[   13.713166] zswap: loaded using pool lzo/zbud
[   13.752501] Kernel panic - not syncing: stack-protector: Kernel stack is 
corrupted in: ftrace_modify_code+0xb0/0xb0
[   13.752501] 
[   13.767397] CPU: 49 PID: 770 Comm: modprobe Not tainted 4.15.0-73-generic 
#82-Ubuntu
[   13.776262] Hardware name: Cavium ThunderX CRB/To be filled by O.E.M., BIOS 
5.11 12/12/2012
[   13.785815] Call trace:
[   13.789466]  dump_backtrace+0x0/0x198
[   13.794364]  show_stack+0x24/0x30
[   13.798936]  dump_stack+0x98/0xbc
[   13.803514]  panic+0x128/0x2a4
[   13.807842]  print_tainted+0x0/0xc0
[   13.812629]  ftrace_update_ftrace_func+0x0/0x48
[   13.818499]  ftrace_make_nop+0xf8/0x168
[   13.823696]  ftrace_process_locs+0x310/0x478
[   13.829344]  ftrace_module_init+0x30/0x38
[   13.834757]  load_module+0xff8/0x15f0
[   13.839836]  SyS_finit_module+0x100/0x118
[   13.845290]  el0_svc_naked+0x30/0x34
[   13.850408] SMP: stopping secondary CPUs
[   13.855868] Kernel Offset: disabled
[   13.860862] CPU features: 0x00901108
[   13.865960] Memory Limit: none
[   13.870594] ---[ end Kernel panic - not syncing: stack-protector: Kernel 
stack is corrupted in: ftrace_modify_code+0xb0/0xb0


** Also affects: linux (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Bionic)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1855059

Title:
  [Regression] 4.15.0-73.82 Can not boot ThunderX

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Bionic:
  Confirmed

Bug description:
  On ThunderX 1socket system. The kernel output log

  https://pastebin.ubuntu.com/p/35DGgPz5N4/

  On ThunderX 2socket system, The kernel output log

  https://pastebin.ubuntu.com/p/T3fVzwxhmt/

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