[Bug 238520] [sctp] Fatal trap 9: general protection fault while in kernel mode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238520

            Bug ID: 238520
           Summary: [sctp] Fatal trap 9: general protection fault while in
                    kernel mode
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: panic, stress2
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pho at FreeBSD.org
                CC: net at FreeBSD.org

20190612 11:51:26 all (1/1): sctp.sh
Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer     = 0x20:0xffffffff80ba77a8
stack pointer           = 0x28:0xfffffe00ae6275f0
frame pointer           = 0x28:0xfffffe00ae627670
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         = 69451 (server)
trap number             = 9
panic: general protection fault
cpuid = 2
time = 1560333091
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00ae627300
vpanic() at vpanic+0x19d/frame 0xfffffe00ae627350
panic() at panic+0x43/frame 0xfffffe00ae6273b0
trap_fatal() at trap_fatal+0x39c/frame 0xfffffe00ae627410
trap() at trap+0x6c/frame 0xfffffe00ae627520
calltrap() at calltrap+0x8/frame 0xfffffe00ae627520
--- trap 0x9, rip = 0xffffffff80ba77a8, rsp = 0xfffffe00ae6275f0, rbp =
0xfffffe00ae627670 ---
__mtx_lock_sleep() at __mtx_lock_sleep+0xf8/frame 0xfffffe00ae627670
__mtx_lock_flags() at __mtx_lock_flags+0xee/frame 0xfffffe00ae6276c0
sctp_accept() at sctp_accept+0xa6e/frame 0xfffffe00ae627840
soaccept() at soaccept+0x174/frame 0xfffffe00ae627890
kern_accept4() at kern_accept4+0x26e/frame 0xfffffe00ae627930
accept1() at accept1+0xe8/frame 0xfffffe00ae627990
amd64_syscall() at amd64_syscall+0x291/frame 0xfffffe00ae627ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00ae627ab0

Details @ https://people.freebsd.org/~pho/stress/log/sctp.txt

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