[Bug 228807] dump can core

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228807

            Bug ID: 228807
           Summary: dump can core
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: db at FreeBSD.org

(lldb) bt
* thread #1, name = 'dump', stop reason = signal SIGSEGV
  * frame #0: 0x00000000002091f1 dump`flushtape + 1889
    frame #1: 0x000000000020c53a dump`dumpmap + 250
    frame #2: 0x00000000002068db dump`main + 3803
    frame #3: 0x0000000000205095 dump`_start + 149
(lldb) up
frame #1: 0x000000000020c53a dump`dumpmap + 250
dump`dumpmap:
    0x20c53a <+250>: addl   $0x1, %ebx
    0x20c53d <+253>: addq   $0x400, %r14              ; imm = 0x400
    0x20c544 <+260>: cmpl   0x3c2e(%rip), %ebx        ; u_spcl + 160
    0x20c54a <+266>: jl     0x20c530                  ; <+240>
(lldb) up
frame #2: 0x00000000002068db dump`main + 3803
dump`main:
    0x2068db <+3803>: movl   $0x3, 0x978f(%rip)
    0x2068e5 <+3813>: movq   0x9744(%rip), %rsi        ; disk
    0x2068ec <+3820>: xorl   %ebx, %ebx
    0x2068ee <+3822>: movl   $0x200aae, %edi           ; imm = 0x200AAE
(lldb) p sblock
(void *) $0 = 0x00000008006a7000
(lldb) x/x sblock
0x8006a7000: 0x00000000
(lldb)
0x8006a7004: 0x00000000
(lldb)
0x8006a7008: 0x00000018
(lldb)
0x8006a700c: 0x00000020
(lldb)
0x8006a7010: 0x00000028
(lldb)
0x8006a7014: 0x000013c0

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