kernel panic at kern/arch/x86/trap.c:540, from core 2: Double fault!  Check the kernel stack pointer; you likely ran off the end of the stack.
HW TRAP frame at 0xfffffff000029f40 on core 2
  rax  0x000000000000003d
  rbx  0xffffffffc8667ec0
  rcx  0xffffffffc8667ec8
  rdx  0x00000022c52446ce
  rbp  0xfffffff0000d0fd8
  rsi  0x0000000000000003
  rdi  0xffffffffc8667ec0
  r8   0x0000000000000000
  r9   0x0000000000000002
  r10  0x0000000000000000
  r11  0xfffffff0000d0e70
  r12  0x0000000000000001
  r13  0x0000000000000000
  r14  0x00007f7fff9fecf8
  r15  0x00000164c56a9707
  trap 0x00000008 Double Fault
  gsbs 0xffffffffc8667ec0
  fsbs 0x0000000000000000
  err  0x--------00000000
  rip  0xffffffffc209f6c1
  cs   0x------------0008
  flag 0x0000000000010246
  rsp  0xfffffff0000d0fd8
  ss   0x------------0010
Backtrace of kernel context on Core 2:
#01 [<0xffffffffc209f6c1>] in cpu_halt at arch/x86/idle.c:20
#02 [<0xffffffffc2054706>] in __smp_idle at src/smp.c:84
kernel panic at kern/src/atomic.c:66, from core 3: Lock 0xffffffffc8665240 tried to spin when it shouldn't
Stack Backtrace on Core 3:
#01 [<0xffffffffc200a2bc>] in backtrace at src/kdebug.c:220
#02 [<0xffffffffc2009afd>] in _panic at src/init.c:268
#03 [<0xffffffffc2003998>] in spin_lock at src/atomic.c:66
#04 [<0xffffffffc2031934>] in chanfree at src/ns/chan.c:319
#05 [<0xffffffffc2031a3e>] in chan_release at src/ns/chan.c:179
#06 [<0xffffffffc203115b>] in kref_put at include/kref.h:70
#07 [<0xffffffffc2031848>] in cclose at src/ns/chan.c:333
#08 [<0xffffffffc2041878>] in close_fdt at src/ns/sysfile.c:1843
#09 [<0xffffffffc204cedf>] in proc_destroy at src/process.c:918
#10 [<0xffffffffc2056d36>] in sys_proc_destroy at src/syscall.c:909
#11 [<0xffffffffc2059439>] in syscall at src/syscall.c:2528
#12 [<0xffffffffc2059604>] in run_local_syscall at src/syscall.c:2563
#13 [<0xffffffffc2059b39>] in prep_syscalls at src/syscall.c:2583
#14 [<0xffffffffc20ab38a>] in sysenter_callwrapper at arch/x86/trap.c:854