[Bug 235699] Kernel panics when setting IP address if net.link.ether.inet.garp_rexmit_count=2

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235699

            Bug ID: 235699
           Summary: Kernel panics when setting IP address if
                    net.link.ether.inet.garp_rexmit_count=2
           Product: Base System
           Version: 12.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pete at twisted.org.uk

If this is set then the kernel will panic a second or so after setting a
network address on an interface. This applies to 12.0-RELEASE onwards. It woks
fine on 11. Example and trace is below

root at serpentine-passive:~ #  ifconfig igb0 inet 10.32.10.4/16 up


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x28
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80c987f1
stack pointer           = 0x28:0xfffffe00004d5730
frame pointer           = 0x28:0xfffffe00004d5750
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 12 (swi4: clock (0))
trap number             = 12
panic: page fault
cpuid = 0
time = 1549981620
KDB: stack backtrace:
#0 0xffffffff80bdfdc7 at kdb_backtrace+0x67
#1 0xffffffff80b93fa3 at vpanic+0x1a3
#2 0xffffffff80b93df3 at panic+0x43
#3 0xffffffff8106a7bf at trap_fatal+0x35f
#4 0xffffffff8106a819 at trap_pfault+0x49
#5 0xffffffff81069e3e at trap+0x29e
#6 0xffffffff810450c5 at calltrap+0x8
#7 0xffffffff80c986f6 at ether_output+0x6b6
#8 0xffffffff80d03354 at arprequest+0x4c4
#9 0xffffffff80d0515c at garp_rexmit+0xbc
#10 0xffffffff80bade19 at softclock_call_cc+0x129
#11 0xffffffff80bae2f9 at softclock+0x79
#12 0xffffffff80b57c57 at ithread_loop+0x1a7
#13 0xffffffff80b54da2 at fork_exit+0x82
#14 0xffffffff810460be at fork_trampoline+0xe
Uptime: 2m6s

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