setting a shared library static

[Stan Cox]

The test program via the macros in sdt.h, and help from stap, save away 
dwfl_module_relocate_address(&static variable).  When stap runs it relocates 
&static_variable and when the writeable segment of the .so is mmapped it 
increments it via __access_process_vm and decrements it via 
__access_process_vm.  If static_variable is not in a .so then it works as 
expected.  Otherwise static_variable gets set in stap_uprobe_mmap_found via 
task_finder.c::__stp_call_mmap_callbacks.  The value of &static_variable is 
checked at the mmap and munmap callbacks.  The behavior I'm noticing is that 
at the first callback for munmap the value of &static_variable has become 
unavailable.

eu-readelf -lS libsdt-uprobe.so
There are 36 section headers, starting at offset 0x2518:

Section Headers:
[Nr] Name                 Type         Addr             Off      Size     ES 
Flags Lk Inf Al
[ 0]                      NULL         0000000000000000 00000000 00000000  0 
       0   0  0
[ 1] .note.gnu.build-id   NOTE         0000000000000190 00000190 00000024  0 A 
      0   0  4
[ 2] .gnu.hash            GNU_HASH     00000000000001b8 000001b8 00000064  0 A 
      3   0  8
[ 3] .dynsym              DYNSYM       0000000000000220 00000220 000001f8 24 A 
      4   2  8
[ 4] .dynstr              STRTAB       0000000000000418 00000418 00000119  0 A 
      0   0  1
[ 5] .gnu.version         GNU_versym   0000000000000532 00000532 0000002a  2 A 
      3   0  2
[ 6] .gnu.version_r       GNU_verneed  0000000000000560 00000560 00000020  0 A 
      4   1  8
[ 7] .rela.dyn            RELA         0000000000000580 00000580 00000258 24 A 
      3   0  8
[ 8] .rela.plt            RELA         00000000000007d8 000007d8 00000048 24 A 
      3  10  8
[ 9] .init                PROGBITS     0000000000000820 00000820 00000018  0 
AX     0   0  4
[10] .plt                 PROGBITS     0000000000000838 00000838 00000040 16 
AX     0   0  4
[11] .text                PROGBITS     0000000000000880 00000880 00000718  0 
AX     0   0 16
[12] .fini                PROGBITS     0000000000000f98 00000f98 0000000e  0 
AX     0   0  4
[13] .rodata              PROGBITS     0000000000000fa8 00000fa8 00000119  0 A 
      0   0  8
[14] .eh_frame_hdr        PROGBITS     00000000000010c4 000010c4 0000001c  0 A 
      0   0  4
[15] .eh_frame            PROGBITS     00000000000010e0 000010e0 0000005c  0 A 
      0   0  8
[16] .ctors               PROGBITS     0000000000201140 00001140 00000010  0 
WA     0   0  8
[17] .dtors               PROGBITS     0000000000201150 00001150 00000010  0 
WA     0   0  8
[18] .jcr                 PROGBITS     0000000000201160 00001160 00000008  0 
WA     0   0  8
[19] .data.rel.ro         PROGBITS     0000000000201168 00001168 00000008  0 
WA     0   0  8
[20] .dynamic             DYNAMIC      0000000000201170 00001170 00000190 16 
WA     4   0  8
[21] .got                 PROGBITS     0000000000201300 00001300 00000050  8 
WA     0   0  8
[22] .got.plt             PROGBITS     0000000000201350 00001350 00000030  8 
WA     0   0  8
[23] .probes              PROGBITS     0000000000201380 00001380 00000122  0 
WA     0   0  8
[24] .bss                 NOBITS       00000000002014a8 000014a2 00000018  0 
WA     0   0  8
[25] .comment             PROGBITS     0000000000000000 000014a2 0000010e  0 
       0   0  1
[26] .debug_aranges       PROGBITS     0000000000000000 000015b0 00000060  0 
       0   0  1
[27] .debug_pubnames      PROGBITS     0000000000000000 00001610 000000e5  0 
       0   0  1
[28] .debug_info          PROGBITS     0000000000000000 000016f5 000007e2  0 
       0   0  1
[29] .debug_abbrev        PROGBITS     0000000000000000 00001ed7 0000017e  0 
       0   0  1
[30] .debug_line          PROGBITS     0000000000000000 00002055 0000010b  0 
       0   0  1
[31] .debug_str           PROGBITS     0000000000000000 00002160 000001cc  1 
MS     0   0  1
[32] .debug_loc           PROGBITS     0000000000000000 0000232c 00000098  0 
       0   0  1
[33] .shstrtab            STRTAB       0000000000000000 000023c4 00000152  0 
       0   0  1
[34] .symtab              SYMTAB       0000000000000000 00002e18 000006d8 24 
      35  54  8
[35] .strtab              STRTAB       0000000000000000 000034f0 0000024a  0 
       0   0  1

Program Headers:
   Type           Offset   VirtAddr           PhysAddr           FileSiz 
MemSiz   Flg Align
   LOAD           0x000000 0x0000000000000000 0x0000000000000000 0x00113c 
0x00113c R E 0x200000
   LOAD           0x001140 0x0000000000201140 0x0000000000201140 0x000362 
0x000380 RW  0x200000
   DYNAMIC        0x001170 0x0000000000201170 0x0000000000201170 0x000190 
0x000190 RW  0x8
   NOTE           0x000190 0x0000000000000190 0x0000000000000190 0x000024 
0x000024 R   0x4
   GNU_EH_FRAME   0x0010c4 0x00000000000010c4 0x00000000000010c4 0x00001c 
0x00001c R   0x4
   GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000 
0x000000 RW  0x8

  Section to Segment mapping:
   Segment Sections...
    00      [RO: .note.gnu.build-id .gnu.hash .dynsym .dynstr .gnu.version 
.gnu.version_r .rela.dyn .rela.plt .init .plt .text .fini .rodata 
.eh_frame_hdr .eh_frame]
    01      .ctors .dtors .jcr .data.rel.ro .dynamic .got .got.plt .probes .bss
    02      .dynamic
    03      [RO: .note.gnu.build-id]
    04      [RO: .eh_frame_hdr]
    05