fatal kernel trap:

   exception       = 0x380 (data segment exception)
   virtual address = 0xffffffffffffffff
   dsisr           = 0x0
   srr0            = 0xc000000002f71edc (0xb71edc)
   srr1            = 0x9000000000009032
   current msr     = 0x9000000000009032
   lr              = 0xc000000002f71ecc (0xb71ecc)
   frame           = 0xc00800014d8a7ed0
   curthread       = 0xc00800012b0d8600
          pid = 46714, comm = access_test

panic: data segment exception trap
cpuid = 119
time = 1590622642
KDB: enter: panic
[ thread pid 46714 tid 104674 ]
Stopped at      kdb_enter+0x78: ori     r0, r0, 0x0

db> bt
Tracing pid 46714 tid 104674 td 0xc00800012b0d8600
0xc00800014d8a7bf0: at vpanic+0x20c
0xc00800014d8a7ca0: at panic+0x40
0xc00800014d8a7cd0: at trap+0x4c4
0xc00800014d8a7e10: at powerpc_interrupt+0x31c
0xc00800014d8a7ea0: kernel DSE trap @ 0xffffffffffffffff by fubyte+0x84: srr1=0x9000000000009032
            r1=0xc00800014d8a8150 cr=0x2820f032 xer=0 ctr=0xc000000002f53858 r2=0xc000000003463000 frame=0xc00800014d8a7ed0
0xc00800014d8a8150: at mmu_radix_enter+0x810
0xc00800014d8a8270: at copyinstr+0x50
0xc00800014d8a82c0: at namei+0x124
0xc00800014d8a8410: at kern_accessat+0x120
0xc00800014d8a85e0: at sys_access+0x30
0xc00800014d8a8610: at trap+0x850
0xc00800014d8a8750: at powerpc_interrupt+0x31c
0xc00800014d8a87e0: user SC trap by 0x810197350: srr1=0x900000000200f032
            r1=0xfffffbfffd1a0 cr=0x22000a82 xer=0 ctr=0x810197340 r2=0x81034ff90 frame=0xc00800014d8a8810