[Bug 201466] ifconfig called from ruby shell class causes kernel panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201466

            Bug ID: 201466
           Summary: ifconfig called from ruby shell class causes kernel
                    panic
           Product: Base System
           Version: 10.2-BETA1
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tss at e-ontap.com

Created attachment 158594
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=158594&action=edit
core.txt

This code causes kernel panic in FreeBSD 10.2-BETA1.
(same as with GENERIC kernel)

#!/usr/local/bin/ruby21
require 'shell'
Shell.def_system_command("ifconfig", path = "/sbin/ifconfig")
sh=Shell.new
sh.ifconfig('epair','create')

-------------------------------------------------------

freebsd102 dumped core - see /var/crash/vmcore.0

Sat Jul 11 06:49:32 JST 2015

FreeBSD freebsd102 10.2-BETA1 FreeBSD 10.2-BETA1 #0 r285358: Sat Jul 11
04:42:16 JST 2015     root at freebsd102:/usr/obj/usr/src/sys/VIMAGE  i386

panic: page fault

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This GDB was configured as "i386-marcel-freebsd"...

Unread portion of the kernel message buffer:


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address    = 0x0
fault code        = supervisor read, page not present
instruction pointer    = 0x20:0x0
stack pointer            = 0x28:0xd341c8c4
frame pointer            = 0x28:0xd341c8e4
code segment        = base 0x0, limit 0xfffff, type 0x1b
            = DPL 0, pres 1, def32 1, gran 1
processor eflags    = interrupt enabled, resume, IOPL = 0
current process        = 1056 (ifconfig)
trap number        = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0xc0b74292 at kdb_backtrace+0x52
#1 0xc0b3509b at vpanic+0x11b
#2 0xc0b34f7b at panic+0x1b
#3 0xc106dc5b at trap_fatal+0x30b
#4 0xc106dfc5 at trap_pfault+0x355
#5 0xc106d694 at trap+0x674
#6 0xc10589dc at calltrap+0x6
#7 0xc3fe3aa0 at epair_ioctl+0x70
#8 0xc0c02392 at ifioctl+0x1392
#9 0xc0b95138 at soo_ioctl+0x2c8
#10 0xc0b8d068 at kern_ioctl+0x258
#11 0xc0b8cd6c at sys_ioctl+0xec
#12 0xc106e726 at syscall+0x4a6
#13 0xc1058a71 at Xint0x80_syscall+0x21
Uptime: 1h37m40s
Physical memory: 231 MB
Dumping 72 MB: 57 41 25 9

Reading symbols from /boot/kernel/uhid.ko.symbols...done.
Loaded symbols for /boot/kernel/uhid.ko.symbols
Reading symbols from /boot/kernel/if_epair.ko.symbols...done.
Loaded symbols for /boot/kernel/if_epair.ko.symbols
#0  0x00000000 in ?? ()
(kgdb) #0  0x00000000 in ?? ()
(kgdb)

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