fatal kernel trap:

   exception       = 0x300 (data storage interrupt)
   virtual address = 0x0
   dsisr           = 0x40000000
   srr0            = 0xc000000002995298 (0x6d5298)
   srr1            = 0x9000000000009032
   current msr     = 0x9000000000009032
   lr              = 0xc000000002994c7c (0x6d4c7c)
   frame           = 0xc00800009cb4b740
   curthread       = 0xc0080000a98c1cc0
          pid = 56, comm = sh

panic: data storage interrupt trap
cpuid = 28
time = 1585900369
KDB: enter: panic
[ thread pid 56 tid 100378 ]
Stopped at      kdb_enter+0x78: ori     r0, r0, 0x0
db> bt
Tracing pid 56 tid 100378 td 0xc0080000a98c1cc0
0xc00800009cb4b4a0: at vpanic+0x284
0xc00800009cb4b560: at panic+0x40
0xc00800009cb4b590: at trap+0x528
0xc00800009cb4b6c0: at powerpc_interrupt+0x1a0
0xc00800009cb4b710: kernel DSI read trap @ 0 by vmem_clip+0x2d8: srr1=0x9000000000009032
            r1=0xc00800009cb4b9c0 cr=0x2848d032 xer=0x20040000 ctr=0xc00000000299684c r2=0xc0000000031e9000 sr=0x40000000 frame=0xc00800009cb4b740
0xc00800009cb4b9c0: at vmem_xalloc+0x488
0xc00800009cb4bad0: at qc_import+0x88
0xc00800009cb4bb90: at cache_alloc+0x478
0xc00800009cb4bc40: at cache_alloc_retry+0x54
0xc00800009cb4bca0: at vmem_alloc+0xb8
0xc00800009cb4bd40: at bufkva_alloc+0xf0
0xc00800009cb4bd90: at getnewbuf+0x590
0xc00800009cb4bec0: at getblkx+0x560
0xc00800009cb4c070: at breadn_flags+0x80
0xc00800009cb4c100: at vfs_bio_getpages+0x3a8
0xc00800009cb4c230: at ffs_getpages+0x90
0xc00800009cb4c260: at VOP_GETPAGES_APV+0x54
0xc00800009cb4c2a0: at vnode_pager_getpages+0x48
0xc00800009cb4c300: at vm_pager_get_pages+0x58
0xc00800009cb4c340: at vm_fault+0x7f4
0xc00800009cb4c550: at vm_fault_trap+0x8c
0xc00800009cb4c5b0: at trap_pfault+0x104
0xc00800009cb4c660: at trap+0x550
0xc00800009cb4c790: at powerpc_interrupt+0x1a0
0xc00800009cb4c7e0: user DSI read trap @ 0x81030c9a8 by 0x81003f2e4: srr1=0x900000000000d032
            r1=0xfffffbfffce40 cr=0x42044042 xer=0 ctr=0x1b r2=0x810070720 sr=0x40000000 frame=0xc00800009cb4c810