kernel warning at kern/src/event.c:374, from core 0: [kernel] Null ev_q - kernel code should check before sending!
Stack Backtrace on Core 0:
#01 [<0xffffffffc200a33c>] in backtrace at src/kdebug.c:220
#02 [<0xffffffffc2009bd4>] in _warn at src/init.c:323
#03 [<0xffffffffc2007752>] in send_event at src/event.c:374
#04 [<0xffffffffc20560d5>] in sys_send_event at src/syscall.c:1439
#05 [<0xffffffffc2059569>] in syscall at src/syscall.c:2455
#06 [<0xffffffffc2059734>] in run_local_syscall at src/syscall.c:2490
#07 [<0xffffffffc2059c69>] in prep_syscalls at src/syscall.c:2510
#08 [<0xffffffffc20ab5fa>] in sysenter_callwrapper at arch/x86/trap.c:854