[Bug 273956] KERN_PROC_VMMAP does not read all mapped files

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273956

--- Comment #6 from Ed Maste <emaste@freebsd.org> ---
On 13.2 for /bin/sleep I see:

  PID              START                END PRT  RES PRES REF SHD FLAG  TP PATH
 1120     0x2a57e7f66000     0x2a57e7f67000 r--    1    2   3   1 CN--- vn
/bin/sleep
 1120     0x2a57e7f67000     0x2a57e7f69000 r-x    2    2   3   1 CN--- vn
/bin/sleep
 1120     0x2a57e7f69000     0x2a57e7f6a000 rw-    1    0   1   0 C---- vn
/bin/sleep
 1120     0x2a57e7f6a000     0x2a57e7f6b000 rw-    1    1   1   0 ----- df 
 1120     0x2a5fe86e6000     0x2a60086c6000 ---    0    0   0   0 ----- gd 
...

phdrs:
  LOAD           0x0000000000000000 0x0000000000000000 0x0000000000000000
                 0x0000000000000bac 0x0000000000000bac  R      0x1000
  LOAD           0x0000000000000bb0 0x0000000000001bb0 0x0000000000001bb0
                 0x0000000000000820 0x0000000000000820  R E    0x1000
  LOAD           0x00000000000013d0 0x00000000000033d0 0x00000000000033d0
                 0x00000000000001f8 0x00000000000001f8  RW     0x1000
  LOAD           0x00000000000015c8 0x00000000000045c8 0x00000000000045c8
                 0x00000000000000c0 0x00000000000000d0  RW     0x1000

So it seems that we have all but the last PT_LOAD in each case, it's just that
13.2 has four PT_LOAD segments (R, RX, RW, RW) and we see 3 in procstat while
14.0 has three segments (R, RX, RW) and we see 2.

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