[Bug 267261] panic: _assert_sbuf_integrity:122: wrote past end of sbuf (0 >= 0)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267261

            Bug ID: 267261
           Summary: panic: _assert_sbuf_integrity:122: wrote past end of
                    sbuf (0 >= 0)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: bz@FreeBSD.org

I added func:line to the three identical prints out of the assertions (one
later in the code);  this is the else case in _assert_sbuf_integrity.

The code in questions comes out of debugfs but it makes me question if there
can be a simply create and delete combination as a reproducer?  I haven't dug
in yet.


panic: _assert_sbuf_integrity:122: wrote past end of sbuf (0 >= 0)
cpuid = 3
time = 1666385636
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe008a3047b0
vpanic() at vpanic+0x151/frame 0xfffffe008a304800
panic() at panic+0x43/frame 0xfffffe008a304860
sbuf_setpos() at sbuf_setpos/frame 0xfffffe008a304870
sbuf_delete() at sbuf_delete+0x18/frame 0xfffffe008a304890
..

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