[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

--- Comment #4 from T.Suzuki <tss at e-ontap.com> ---
# dtruss -af ./test.rb
PID/LWP    RELATIVE  ELAPSD    CPU SYSCALL(args)          = return
   801/100072:        62     623     35 mmap(0x0, 0x8000, 0x3)         =
671494144 0
   801/100072:       122       6      0 issetugid(0x0, 0x0, 0x0)         = 0 0
   801/100072:       188      23     20 lstat("/etc\0", 0xBFBFD608, 0x0)       
 = 0 0
   801/100072:       200      13     11 lstat("/etc/libmap.conf\0", 0xBFBFD608,
0x0)         = 0 0
dtrace: error on enabled probe ID 1084 (ID 51569:
syscall:freebsd:openat:return): invalid address (0xffffff9c) in action #12 at
DIF offset 24
   801/100072:       219       4      2 fstat(0x3, 0xBFBFE2A8, 0x0)         = 0
0shell(#<Th:0x28cd1c48>): /sbin/ifconfig epair create

   801/100072:       270      53     51 mmap(0x0, 0x6B, 0x1)         =
shell(#<Th:0x28cd1c48>): Process finishing, but active shell exists
                         You can use Shell#transact or Shell#check_point for
more safe execution.

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