[Bug 204802] [dtrace] panic: fatal double fault in fbt/nfs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204802

            Bug ID: 204802
           Summary: [dtrace] panic: fatal double fault in fbt/nfs
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

I was running the dtrace test suite on ~r290924 and ran into the following
panic double fault:

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Unread portion of the kernel message buffer:

Fatal double fault
rip = 0xffffffff82262310
rsp = 0xfffffe00dd45fc60
rbp = 0xfffffe00dd460f80
cpuid = 2; apic id = 02
panic: double fault
cpuid = 2
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00d7ea0e30
vpanic() at vpanic+0x182/frame 0xfffffe00d7ea0eb0
panic() at panic+0x43/frame 0xfffffe00d7ea0f10
dblfault_handler() at dblfault_handler+0xa2/frame 0xfffffe00d7ea0f30
Xdblfault() at Xdblfault+0xac/frame 0xfffffe00d7ea0f30
--- trap 0x17, rip = 0xffffffff82262310, rsp = 0xfffffe00dd45fc60, rbp =
0xfffffe00dd460f80 ---
dtrace_disx86() at dtrace_disx86+0x170/frame 0xfffffe00dd460f80
dtrace_dis_isize() at dtrace_dis_isize+0x76/frame 0xfffffe00dd461590
dtrace_instr_size() at dtrace_instr_size+0x32/frame 0xfffffe00dd4615c0
dtrace_trap() at dtrace_trap+0x138/frame 0xfffffe00dd461630
trap_check() at trap_check+0x1e/frame 0xfffffe00dd461650
calltrap() at calltrap+0x8/frame 0xfffffe00dd461650
--- trap 0xc, rip = 0xffffffff8223b1ab, rsp = 0xfffffe00dd461720, rbp =
0xfffffe00dd461768 ---
dtrace_load8() at dtrace_load8+0x10b/frame 0xfffffe00dd461768
dtrace_dif_subr() at dtrace_dif_subr+0x2385/frame 0xfffffe00dd461ec8
dtrace_dif_emulate() at dtrace_dif_emulate+0x1df4/frame 0xfffffe00dd462488
dtrace_probe() at dtrace_probe+0xbfb/frame 0xfffffe00dd462878
fbt_invop() at fbt_invop+0x1a5/frame 0xfffffe00dd462948
dtrace_invop() at dtrace_invop+0x40/frame 0xfffffe00dd462988
dtrace_invop_start() at dtrace_invop_start+0x22/frame 0xfffffe00dd462af0
clnt_vc_call() at clnt_vc_call+0x7e7/frame 0xfffffe00dd462c60
clnt_reconnect_call() at clnt_reconnect_call+0x676/frame 0xfffffe00dd462d20
newnfs_request() at newnfs_request+0xa53/frame 0xfffffe00dd462e80
nfscl_request() at nfscl_request+0x72/frame 0xfffffe00dd462ed0
nfsrpc_getattr() at nfsrpc_getattr+0xb8/frame 0xfffffe00dd463020
nfs_getattr() at nfs_getattr+0x176/frame 0xfffffe00dd4631d0
VOP_GETATTR_APV() at VOP_GETATTR_APV+0xa0/frame 0xfffffe00dd463200
nfs_lookup() at nfs_lookup+0x483/frame 0xfffffe00dd463530
VOP_LOOKUP_APV() at VOP_LOOKUP_APV+0xa0/frame 0xfffffe00dd463560
lookup() at lookup+0x59e/frame 0xfffffe00dd4635e0
namei() at namei+0x5a1/frame 0xfffffe00dd4636a0
vn_open_cred() at vn_open_cred+0x21c/frame 0xfffffe00dd463810
kern_openat() at kern_openat+0x25f/frame 0xfffffe00dd463990
amd64_syscall() at amd64_syscall+0x50b/frame 0xfffffe00dd463ab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe00dd463ab0
--- syscall (5, FreeBSD ELF64, sys_open), rip = 0x801385eaa, rsp =
0x7fffffff9938, rbp = 0x7fffffff9970 ---

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