kernel warning at kern/src/printfmt.c:181, from core 1: _x && _x < ULIM
Stack Backtrace on Core 1:
#01 [<0xffffffffc200a42c>] in backtrace at src/kdebug.c:235
#02 [<0xffffffffc2009c54>] in _warn at src/init.c:326
#03 [<0xffffffffc2049189>] in vprintfmt at src/printfmt.c:181
#04 [<0xffffffffc2049312>] in vsnprintf at src/printfmt.c:328
#05 [<0xffffffffc2058539>] in vset_errstr at src/syscall.c:509
#06 [<0xffffffffc205866b>] in set_error at src/syscall.c:542
#07 [<0xffffffffc2039a29>] in cmderror at src/ns/parse.c:121
#08 [<0xffffffffc2039b1b>] in lookupcmd at src/ns/parse.c:152
#09 [<0xffffffffc206273c>] in igbectl at drivers/net/etherigbe.c:731
#10 [<0xffffffffc2079479>] in etherwrite at drivers/dev/ether.c:490
#11 [<0xffffffffc2040639>] in rwrite at src/ns/sysfile.c:1117
#12 [<0xffffffffc204088b>] in syswrite at src/ns/sysfile.c:1135
#13 [<0xffffffffc20593e9>] in sys_write at src/syscall.c:1785
#14 [<0xffffffffc2059f49>] in syscall at src/syscall.c:2578
#15 [<0xffffffffc205aaf8>] in run_local_syscall at src/syscall.c:2615
#16 [<0xffffffffc205b039>] in prep_syscalls at src/syscall.c:2635
#17 [<0xffffffffc20ac812>] in sysenter_callwrapper at arch/x86/trap.c:877
kernel panic at kern/arch/x86/trap.c:318, from core 1: Proc-ful Page Fault in the Kernel at 0x0000000000000008!
HW TRAP frame at 0xfffffff000011980 on core 1
  rax  0x00000000000002c0
  rbx  0xfffffff000011ac8
  rcx  0x00000000000003d4
  rdx  0x0000000000000005
  rbp  0xfffffff000011ab8
  rsi  0xfffffff000011ac8
  rdi  0xffffffffc2048830
  r8   0xffff8000000b8fa0
  r9   0x0000000000000f00
  r10  0xffff8000000b8f00
  r11  0xffff8000000b8ec0
  r12  0xffffffffc2048830
  r13  0xfffffff000011b20
  r14  0x0000000000000005
  r15  0xffff80000d804219
  trap 0x0000000e Page Fault
  gsbs 0xffffffffc8e37dc0
  fsbs 0x0000000000000000
  err  0x--------00000000
  rip  0xffffffffc2019161
  cs   0x------------0008
  flag 0x0000000000010206
  rsp  0xfffffff000011a48
  ss   0x------------0010
Backtrace of kernel context on Core 1:
#01 [<0xffffffffc2019161>] in printipv4 at src/net/eipconv.c:105
#02 [<0xffffffffc2049312>] in vsnprintf at src/printfmt.c:328
#03 [<0xffffffffc2058539>] in vset_errstr at src/syscall.c:509
#04 [<0xffffffffc205866b>] in set_error at src/syscall.c:542
#05 [<0xffffffffc2039a29>] in cmderror at src/ns/parse.c:121
#06 [<0xffffffffc2039b1b>] in lookupcmd at src/ns/parse.c:152
#07 [<0xffffffffc206273c>] in igbectl at drivers/net/etherigbe.c:731
#08 [<0xffffffffc2079479>] in etherwrite at drivers/dev/ether.c:490
#09 [<0xffffffffc2040639>] in rwrite at src/ns/sysfile.c:1117
#10 [<0xffffffffc204088b>] in syswrite at src/ns/sysfile.c:1135
#11 [<0xffffffffc20593e9>] in sys_write at src/syscall.c:1785
#12 [<0xffffffffc2059f49>] in syscall at src/syscall.c:2578
#13 [<0xffffffffc205aaf8>] in run_local_syscall at src/syscall.c:2615
#14 [<0xffffffffc205b039>] in prep_syscalls at src/syscall.c:2635
#15 [<0xffffffffc20ac812>] in sysenter_callwrapper at arch/x86/trap.c:877