[Bug 276761] panic: sbsndptr_noadv: sb_mb is NULL

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276761

            Bug ID: 276761
           Summary: panic: sbsndptr_noadv: sb_mb is NULL
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: ddaniel@nvidia.com

While running the internal tests we regularly get panic.
panic: sbsndptr_noadv: sb_mb is NULL


#1  doadump (textdump=textdump@entry=1) at
/usr/kernel_git_main/sys/kern/kern_shutdown.c:403
#2  0xffffffff80b3de30 in kern_reboot (howto=260) at
/usr/kernel_git_main/sys/kern/kern_shutdown.c:521
#3  0xffffffff80b3e333 in vpanic (fmt=0xffffffff8113018d "%s: sb_mb is NULL",
ap=ap@entry=0xfffffe00e3afdb60)
    at /usr/kernel_git_main/sys/kern/kern_shutdown.c:973
#4  0xffffffff80b3e183 in panic (fmt=<unavailable>) at
/usr/kernel_git_main/sys/kern/kern_shutdown.c:889
#5  0xffffffff80bede41 in sbsndptr_noadv (sb=<optimized out>, off=<optimized
out>, moff=<unavailable>) at /usr/kernel_git_main/sys/kern/uipc_sockbuf.c:1694
#6  0xffffffff80d3ab4e in tcp_default_output (tp=0xfffff801cad14000,
tp@entry=<error reading variable: value is not available>)
    at /usr/kernel_git_main/sys/netinet/tcp_output.c:1069
#7  0xffffffff80d4d17f in tcp_output_locked (tp=0xfffff801cad14000) at
/usr/kernel_git_main/sys/netinet/tcp_timer.c:298
#8  tcp_timer_rexmt (tp=0xfffff801cad14000) at
/usr/kernel_git_main/sys/netinet/tcp_timer.c:805
#9  0xffffffff80d4c71e in tcp_timer_enter (xtp=0xfffff801cad14000) at
/usr/kernel_git_main/sys/netinet/tcp_timer.c:880
#10 0xffffffff80b5cd56 in softclock_call_cc (c=0xfffff801cad14198,
cc=cc@entry=0xffffffff821e4300, direct=direct@entry=0)
    at /usr/kernel_git_main/sys/kern/kern_timeout.c:714
#11 0xffffffff80b5e376 in softclock_thread (arg=arg@entry=0xffffffff821e4300)
at /usr/kernel_git_main/sys/kern/kern_timeout.c:846
#12 0xffffffff80af3b42 in fork_exit (callout=0xffffffff80b5e2b0
<softclock_thread>, arg=0xffffffff821e4300, frame=0xfffffe00e3afdf40)
    at /usr/kernel_git_main/sys/kern/kern_fork.c:1157


debug kernel and vmcore available, and we can reproduce the problem on damand

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