[Bug 230950] UDP6 panics after r338306

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230950

            Bug ID: 230950
           Summary: UDP6 panics after r338306
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: sbruno at FreeBSD.org
                CC: bz at FreeBSD.org

I'm not 100% sure that these panics are from r338306.  They are from an ftp
mirror and pkg mirror, both induced from unbound doing its ipv6 udp thing.

-----------
Fatal trap 12: page fault while in kernel mode
cpuid = 4; apic id = 32
fault virtual address   = 0x68
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80a5380b
stack pointer           = 0x28:0xfffffe0141068500
frame pointer           = 0x28:0xfffffe0141068750
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         = 38582 (unbound)
[ thread pid 38582 tid 100859 ]
Stopped at      ip6_output+0x18db:      movq    ll+0x47(%rcx),%rcx
db> bt
Tracing pid 38582 tid 100859 td 0xfffff8010988b000
ip6_output() at ip6_output+0x18db/frame 0xfffffe0141068750
udp6_send() at udp6_send+0x7f8/frame 0xfffffe0141068910
sosend_dgram() at sosend_dgram+0x33b/frame 0xfffffe0141068980
kern_sendit() at kern_sendit+0x237/frame 0xfffffe0141068a20
sendit() at sendit+0x19e/frame 0xfffffe0141068a70
sys_sendto() at sys_sendto+0x4d/frame 0xfffffe0141068ac0
amd64_syscall() at amd64_syscall+0x369/frame 0xfffffe0141068bf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0141068bf0
--- syscall (133, FreeBSD ELF64, sys_sendto), rip = 0x800836efa, rsp =
0x7fffdf9fa988, rbp = 0x7fffdf9fa9d0 ---

--------

Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0x7c
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80a4d344
stack pointer           = 0x28:0xfffffe0094a36490
frame pointer           = 0x28:0xfffffe0094a364d0
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         = 1247 (unbound)
[ thread pid 1247 tid 100907 ]
Stopped at      selectroute+0x194:      movl    ll+0x5b(%rdi),%eax
db> 
db> bt
Tracing pid 1247 tid 100907 td 0xfffff8000d131580
selectroute() at selectroute+0x194/frame 0xfffffe0094a364d0
in6_selectroute_fib() at in6_selectroute_fib+0xf/frame 0xfffffe0094a364f0
ip6_output() at ip6_output+0xfc4/frame 0xfffffe0094a36750
udp6_send() at udp6_send+0x7f8/frame 0xfffffe0094a36910
sosend_dgram() at sosend_dgram+0x33b/frame 0xfffffe0094a36980
kern_sendit() at kern_sendit+0x237/frame 0xfffffe0094a36a20
sendit() at sendit+0x19e/frame 0xfffffe0094a36a70
sys_sendto() at sys_sendto+0x4d/frame 0xfffffe0094a36ac0
amd64_syscall() at amd64_syscall+0x369/frame 0xfffffe0094a36bf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0094a36bf0
--- syscall (133, FreeBSD ELF64, sys_sendto), rip = 0x800836efa, rsp =
0x7fffdfdfcce8, rbp = 0x7fffdfdfcd30 ---

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