[Bug 235549] [nullfs] panic: Don't call insmntque(foo, NULL)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235549

            Bug ID: 235549
           Summary: [nullfs] panic: Don't call insmntque(foo, NULL)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: stress2
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pho at FreeBSD.org

nullfs(5) stress test scenario.

panic: Don't call insmntque(foo, NULL)
cpuid = 1
time = 1549366443
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe00b98fe610
vpanic() at vpanic+0x20c/frame 0xfffffe00b98fe670
panic() at panic+0x43/frame 0xfffffe00b98fe6d0
insmntque1() at insmntque1+0x306/frame 0xfffffe00b98fe720
null_nodeget() at null_nodeget+0x1a1/frame 0xfffffe00b98fe790
null_vptocnp() at null_vptocnp+0x15d/frame 0xfffffe00b98fe7f0
VOP_VPTOCNP_APV() at VOP_VPTOCNP_APV+0xee/frame 0xfffffe00b98fe820
vn_vptocnp() at vn_vptocnp+0x136/frame 0xfffffe00b98fe8b0
vn_fullpath1() at vn_fullpath1+0x1c0/frame 0xfffffe00b98fe920
kern___getcwd() at kern___getcwd+0xf9/frame 0xfffffe00b98fe980
amd64_syscall() at amd64_syscall+0x45e/frame 0xfffffe00b98feab0

https://people.freebsd.org/~pho/stress/log/crossmp4.txt

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