Memory modified after free 0xfffff8002c7c02b0(8) val=ffffed30 @ 0xfffff8002c7c02b0
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0x7fff00000010                                                                                                                                                                                                       fault code              = supervisor read data, page not present                                                                                                                                                                               instruction pointer     = 0x20:0xffffffff80d4d8be
stack pointer           = 0x28:0xfffffe00933e8160
frame pointer           = 0x28:0xfffffe00933e8170
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 766 (dtrace_ioctl)
[ thread pid 766 tid 100100 ]
Stopped at      mtrash_ctor+0x6e:       movq    0x10(%rax),%rsi
db>
db> panic
panic: from debugger
cpuid = 1
time = 1495897821
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00933e7b30
vpanic() at vpanic+0x19c/frame 0xfffffe00933e7bb0
panic() at panic+0x43/frame 0xfffffe00933e7c10
db_panic() at db_panic+0x17/frame 0xfffffe00933e7c20
db_command() at db_command+0x2bf/frame 0xfffffe00933e7cf0
db_command_loop() at db_command_loop+0x64/frame 0xfffffe00933e7d00
db_trap() at db_trap+0xef/frame 0xfffffe00933e7d90
kdb_trap() at kdb_trap+0x193/frame 0xfffffe00933e7e20
trap_fatal() at trap_fatal+0x2e2/frame 0xfffffe00933e7e70
trap_pfault() at trap_pfault+0x62/frame 0xfffffe00933e7ed0
trap() at trap+0x2ad/frame 0xfffffe00933e8090
calltrap() at calltrap+0x8/frame 0xfffffe00933e8090
--- trap 0xc, rip = 0xffffffff80d4d8be, rsp = 0xfffffe00933e8160, rbp = 0xfffffe00933e8170 ---
mtrash_ctor() at mtrash_ctor+0x6e/frame 0xfffffe00933e8170
uma_zalloc_arg() at uma_zalloc_arg+0x52c/frame 0xfffffe00933e81d0
malloc() at malloc+0x1e0/frame 0xfffffe00933e8220
dtrace_probe_create() at dtrace_probe_create+0x252/frame 0xfffffe00933e8290
dtvirt_probe_create() at dtvirt_probe_create+0x241/frame 0xfffffe00933e8450
dtrace_ioctl() at dtrace_ioctl+0x27b1/frame 0xfffffe00933e8550
devfs_ioctl() at devfs_ioctl+0xc0/frame 0xfffffe00933e85a0
VOP_IOCTL_APV() at VOP_IOCTL_APV+0xe0/frame 0xfffffe00933e85d0
vn_ioctl() at vn_ioctl+0x124/frame 0xfffffe00933e86d0
devfs_ioctl_f() at devfs_ioctl_f+0x1f/frame 0xfffffe00933e86f0
kern_ioctl() at kern_ioctl+0x2cd/frame 0xfffffe00933e8750
sys_ioctl() at sys_ioctl+0x16f/frame 0xfffffe00933e8830
amd64_syscall() at amd64_syscall+0x589/frame 0xfffffe00933e89b0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe00933e89b0
--- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x80051367a, rsp = 0x7fffffffe7f8, rbp = 0x7fffffffea90 ---