[Bug 206761] Kernel stack overflow in sysctl handler for kern.binmisc.add

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206761

--- Comment #11 from Sean Bruno <sbruno at FreeBSD.org> ---
Without this patch from sson, machine panics as described:

panic: stack overflow detected; backtrace may be corrupted
cpuid = 3
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe046ad0cb40
vpanic() at vpanic+0x182/frame 0xfffffe046ad0cbc0
panic() at panic+0x43/frame 0xfffffe046ad0cc20
__stack_chk_fail() at __stack_chk_fail+0x12/frame 0xfffffe046ad0cc30
sysctl_kern_binmisc() at sysctl_kern_binmisc+0x7b4/frame 0xfffffe046ad0d8b0
KDB: enter: panic
[ thread pid 16434 tid 101185 ]
Stopped at      kdb_enter+0x3b: movq    $0,kdb_why
db> bt
Tracing pid 16434 tid 101185 td 0xfffff8010054b9a0
kdb_enter() at kdb_enter+0x3b/frame 0xfffffe046ad0cb40
vpanic() at vpanic+0x19f/frame 0xfffffe046ad0cbc0
panic() at panic+0x43/frame 0xfffffe046ad0cc20
__stack_chk_fail() at __stack_chk_fail+0x12/frame 0xfffffe046ad0cc30
sysctl_kern_binmisc() at sysctl_kern_binmisc+0x7b4/frame 0xfffffe046ad0d8b0
db>

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