[Bug 274406] panic: SACK scoreboard empty, but accounting non-zero

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274406

            Bug ID: 274406
           Summary: panic: SACK scoreboard empty, but accounting non-zero
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pho@FreeBSD.org

Seen during stress tests.

20231011 07:22:12 all (433/925): jumbo.sh
panic: SACK scoreboard empty, but accounting non-zero

cpuid = 10
time = 1697001775
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00e49fa920
vpanic() at vpanic+0x132/frame 0xfffffe00e49faa50
panic() at panic+0x43/frame 0xfffffe00e49faab0
tcp_sack_doack() at tcp_sack_doack+0x7f6/frame 0xfffffe00e49fab40
tcp_do_segment() at tcp_do_segment+0x20b7/frame 0xfffffe00e49fac20
tcp_input_with_port() at tcp_input_with_port+0x1157/frame 0xfffffe00e49fad70
tcp_input() at tcp_input+0xb/frame 0xfffffe00e49fad80
ip_input() at ip_input+0x2ab/frame 0xfffffe00e49fade0
swi_net() at swi_net+0x19b/frame 0xfffffe00e49fae60
ithread_loop() at ithread_loop+0x266/frame 0xfffffe00e49faef0
fork_exit() at fork_exit+0x82/frame 0xfffffe00e49faf30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00e49faf30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---

Details @ https://people.freebsd.org/~pho/stress/log/log0490.txt

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