db> kill 11 4160
panic: lock (sleep mutex) process lock not locked @ /usr/src/sys/ddb/db_command.c:710
cpuid = 16
time = 1588981737
KDB: stack backtrace:
0xc0000000033b8230: at kdb_backtrace+96
0xc0000000033b8340: at vpanic+484
0xc0000000033b83f0: at panic+64
0xc0000000033b8420: at witness_unlock+396
0xc0000000033b84b0: at __mtx_unlock_flags+116
0xc0000000033b8540: at db_hex2dec+2144
0xc0000000033b85e0: at db_command_loop+984
0xc0000000033b8730: at db_command_loop+136
0xc0000000033b87b0: at db_fetch_ksymtab+1044
0xc0000000033b8910: at kdb_trap+608
0xc0000000033b8a10: at db_trap_glue+192
0xc0000000033b8a40: at breakpoint+400
0xc0080000a5433650: at kdb_enter+96
0xc0080000a54336d0: at opal_wait_completion+14848
0xc0080000a5433750: at powerpc_interrupt+392
0xc0080000a54337e0: user trap 0xe60 by 34630350268: srr1=0x900000000280f032
            r1=0xfffffbfff6620 cr=0x48282a22 xer=0 ctr=0x81021357c r2=0x81031bf60 frame=0xc0080000a5433810
Uptime: 41m31s
Dumping 764 out of 65188 MB:..1%
fatal kernel trap:

   exception       = 0x380 (data segment exception)
   virtual address = 0xc84001e87d3b0200
   dsisr           = 0xa000000
   srr0            = 0xc000000002e3679c (0xb7679c)
   srr1            = 0x9000000000001032
   current msr     = 0x9000000000001032
   lr              = 0xc000000002e7d7d4 (0xbbd7d4)
   frame           = 0xc0000000033b7a80
   curthread       = 0xc00800009c1ac0e0
          pid = 4160, comm = python2.7

panic: data segment exception trap
cpuid = 16
time = 1588981737
KDB: stack backtrace:
0xc0000000033b7610: at kdb_backtrace+96
0xc0000000033b7720: at vpanic+484
0xc0000000033b77d0: at panic+64
0xc0000000033b7800: at trap+5708
0xc0000000033b7890: at trap+1128
0xc0000000033b79c0: at powerpc_interrupt+440
0xc0000000033b7a50: kernel DSE trap @ 0xc84001e87d3b0200 by mmu_radix_kremove+140: srr1=0x9000000000001032
            r1=0xc0000000033b7d00 cr=0x4440f482 xer=0 ctr=0xc000000002e36710 r2=0xc0000000036c0000 frame=0xc0000000033b7a80
0xc0000000033b7d00: at dtrace_invop_jump_addr+8876
0xc0000000033b7d70: at pmap_kremove+148
0xc0000000033b7db0: at minidumpsys+2876
0xc0000000033b7eb0: at minidumpsys+1400
0xc0000000033b80d0: at dumpsys_generic+140
0xc0000000033b8250: at doadump+200
0xc0000000033b8290: at kern_reboot+1384
0xc0000000033b8340: at vpanic+640
0xc0000000033b83f0: at panic+64
0xc0000000033b8420: at witness_unlock+396
0xc0000000033b84b0: at __mtx_unlock_flags+116
0xc0000000033b8540: at db_hex2dec+2144
0xc0000000033b85e0: at db_command_loop+984
0xc0000000033b8730: at db_command_loop+136
0xc0000000033b87b0: at db_fetch_ksymtab+1044
0xc0000000033b8910: at kdb_trap+608
0xc0000000033b8a10: at db_trap_glue+192
0xc0000000033b8a40: at breakpoint+400
0xc0080000a5433650: at kdb_enter+96
0xc0080000a54336d0: at opal_wait_completion+14848
0xc0080000a5433750: at powerpc_interrupt+392
0xc0080000a54337e0: user trap 0xe60 by 34630350268: srr1=0x900000000280f032
            r1=0xfffffbfff6620 cr=0x48282a22 xer=0 ctr=0x81021357c r2=0x81031bf60 frame=0xc0080000a5433810
KDB: enter: panic
[ thread pid 4160 tid 100508 ]
Stopped at      kdb_enter+120:  ori     r0, r0, 0x0
db>