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Subject: [Bug 215513] panic: SACK scoreboard must not be empty
Date: Fri, 23 Dec 2016 13:25:40 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D215513

            Bug ID: 215513
           Summary: panic: SACK scoreboard must not be empty
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: pho@FreeBSD.org

While stress testing I see this a lot.
Seems related to low value of v_free_count.

panic: SACK scoreboard must not be empty
cpuid =3D 10
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0131bcd=
560
vpanic() at vpanic+0x186/frame 0xfffffe0131bcd5e0
kassert_panic() at kassert_panic+0x126/frame 0xfffffe0131bcd650
tcp_sack_doack() at tcp_sack_doack+0x4d4/frame 0xfffffe0131bcd6d0
tcp_do_segment() at tcp_do_segment+0x1a06/frame 0xfffffe0131bcd7c0
tcp_input() at tcp_input+0xd7c/frame 0xfffffe0131bcd920
ip_input() at ip_input+0x17b/frame 0xfffffe0131bcd980
swi_net() at swi_net+0x175/frame 0xfffffe0131bcd9e0
intr_event_execute_handlers() at intr_event_execute_handlers+0x96/frame
0xfffffe0131bcda20
ithread_loop() at ithread_loop+0xa6/frame 0xfffffe0131bcda70
fork_exit() at fork_exit+0x84/frame 0xfffffe0131bcdab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0131bcdab0

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

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