kernel warning at kern/src/event.c:374, from core 2: [kernel] Null ev_q - kernel code should check before sending!
Stack Backtrace on Core 2:
#01 [<0xffffffffc200a38c>] in backtrace at src/kdebug.c:229
#02 [<0xffffffffc2009bb4>] in _warn at src/init.c:322
#03 [<0xffffffffc2007732>] in send_event at src/event.c:374
#04 [<0xffffffffc2056a45>] in sys_send_event at src/syscall.c:1439
#05 [<0xffffffffc205a019>] in syscall at src/syscall.c:2465
#06 [<0xffffffffc205a1f8>] in run_local_syscall at src/syscall.c:2500
#07 [<0xffffffffc205a739>] in prep_syscalls at src/syscall.c:2520
#08 [<0xffffffffc20abee2>] in sysenter_callwrapper at arch/x86/trap.c:854
SW TRAP frame (partial) at 0xffffffffc8995e20 on core 1
  rbx  0x000030000003ce00
  rbp  0x000030000003cef0
  r12  0x0000000000000000
  r13  0x0000000000485678
  r14  0x0000000000487238
  r15  0x0000000000000000
  gsbs 0x0000000000000000
  fsbs 0x0000000000000000
  rip  0x000000000043742e
  rsp  0x000030000003cd20
 mxcsr 0x00001f80
 fpucw 0x037f