kernel panic: Proc-less Page Fault in the Kernel at ADDR!

kernel panic at kern/arch/x86/trap.c:292, from core 0: Proc-less Page Fault in the Kernel at 0x0000000000000008!
HW TRAP frame at 0xfffffff001066ce0 on core 0
  rax  0x0000000000000000
  rbx  0x0000000000000000
  rcx  0x0000000000000000
  rdx  0xffff800034e855a0
  rbp  0xfffffff001066de8
  rsi  0xffff80007f5dbf90
  rdi  0xffff80000d94b618
  r8   0x0000000000020000
  r9   0x0000000000000000
  r10  0x0000000000000078
  r11  0xffffffffc8f70bb8
  r12  0xffffffffc200c220
  r13  0x0000000000000000
  r14  0x0000000000000002
  r15  0x0000000000000000
  trap 0x0000000e Page Fault
  gsbs 0xffffffffc8f70b00
  fsbs 0x0000000000000000
  err  0x--------00000002
  rip  0xffffffffc205bba3
  cs   0x------------0008
  flag 0x0000000000010202
  rsp  0xfffffff001066da8
  ss   0x------------0010
Backtrace of kernel context on Core 0:
#01 [<0xffffffffc205bba3>] in send_kernel_message at src/trap.c:133
#02 [<0xffffffffc200c28e>] in kthread_runnable at src/kthread.c:239
#03 [<0xffffffffc200c315>] in sem_up at src/kthread.c:550
#04 [<0xffffffffc20509fd>] in __sync_cb at src/rcu.c:111
#05 [<0xffffffffc2050a12>] in rcu_exec_cb at src/rcu.c:160
#06 [<     [inline]     >] in run_rcu_cbs at src/rcu.c:527
#06 [<0xffffffffc2050ce2>] in rcu_mgmt_ktask at src/rcu.c:553
#07 [<0xffffffffc200b994>] in __ktask_wrapper at src/kthread.c:292
#08 [<0xffffffffc205bfed>] in process_routine_kmsg at src/trap.c:241
#09 [<0xffffffffc205597e>] in __smp_idle at src/smp.c:78