==6750==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffec181d0b8 at pc 0x7f279ef4def5 bp 0x7ffec181cdc0 sp 0x7ffec181cdb8
WRITE of size 8 at 0x7ffec181d0b8 thread T0
    #0 0x7f279ef4def4 in prephi_ /home/ivan/temp/smash/prephi.f:50
    #1 0x7f279ef4c38b in derivf_ /home/ivan/temp/smash/derivf.f:15
    #2 0x7f279ef4ce34 in getgl_ /home/ivan/temp/smash/getgl.f:18
    #3 0x7f27a645ece6  (/usr/lib/R/lib/libR.so+0xfdce6)
    #4 0x7f27a64960e2  (/usr/lib/R/lib/libR.so+0x1350e2)
    #5 0x7f27a64a8aef in Rf_eval (/usr/lib/R/lib/libR.so+0x147aef)
    #6 0x7f27a64aa936  (/usr/lib/R/lib/libR.so+0x149936)
    #7 0x7f27a64ab886 in Rf_applyClosure (/usr/lib/R/lib/libR.so+0x14a886)
    #8 0x7f27a64a8caf in Rf_eval (/usr/lib/R/lib/libR.so+0x147caf)
    #9 0x7f27a64adce8  (/usr/lib/R/lib/libR.so+0x14cce8)
    #10 0x7f27a64a8f2c in Rf_eval (/usr/lib/R/lib/libR.so+0x147f2c)
    #11 0x7f27a64af2bc  (/usr/lib/R/lib/libR.so+0x14e2bc)
    #12 0x7f27a64960e2  (/usr/lib/R/lib/libR.so+0x1350e2)
    #13 0x7f27a64a8aef in Rf_eval (/usr/lib/R/lib/libR.so+0x147aef)
    #14 0x7f27a64aa936  (/usr/lib/R/lib/libR.so+0x149936)
    #15 0x7f27a64ab886 in Rf_applyClosure (/usr/lib/R/lib/libR.so+0x14a886)
    #16 0x7f27a649ec93  (/usr/lib/R/lib/libR.so+0x13dc93)
    #17 0x7f27a64a8aef in Rf_eval (/usr/lib/R/lib/libR.so+0x147aef)
    #18 0x7f27a64a94db  (/usr/lib/R/lib/libR.so+0x1484db)
    #19 0x7f27a64a8e13 in Rf_eval (/usr/lib/R/lib/libR.so+0x147e13)
    #20 0x7f27a64af7ab  (/usr/lib/R/lib/libR.so+0x14e7ab)
    #21 0x7f27a64ec6a5  (/usr/lib/R/lib/libR.so+0x18b6a5)
    #22 0x7f27a6499c3b  (/usr/lib/R/lib/libR.so+0x138c3b)
    #23 0x7f27a64a8aef in Rf_eval (/usr/lib/R/lib/libR.so+0x147aef)
    #24 0x7f27a64aa936  (/usr/lib/R/lib/libR.so+0x149936)
    #25 0x7f27a64ab886 in Rf_applyClosure (/usr/lib/R/lib/libR.so+0x14a886)
    #26 0x7f27a649ec93  (/usr/lib/R/lib/libR.so+0x13dc93)
    #27 0x7f27a64a8aef in Rf_eval (/usr/lib/R/lib/libR.so+0x147aef)
    #28 0x7f27a64aa936  (/usr/lib/R/lib/libR.so+0x149936)
    #29 0x7f27a64ab886 in Rf_applyClosure (/usr/lib/R/lib/libR.so+0x14a886)
    #30 0x7f27a64a8caf in Rf_eval (/usr/lib/R/lib/libR.so+0x147caf)
    #31 0x7f27a64dc699 in Rf_ReplIteration (/usr/lib/R/lib/libR.so+0x17b699)
    #32 0x7f27a64dc9d0  (/usr/lib/R/lib/libR.so+0x17b9d0)
    #33 0x7f27a64dca87 in run_Rmainloop (/usr/lib/R/lib/libR.so+0x17ba87)
    #34 0x55d380f9807a in main (/usr/lib/R/bin/exec/R+0x107a)
    #35 0x7f27a614c09a in __libc_start_main ../csu/libc-start.c:308
    #36 0x55d380f980b9 in _start (/usr/lib/R/bin/exec/R+0x10b9)

Address 0x7ffec181d0b8 is located in stack of thread T0 at offset 168 in frame
    #0 0x7f279ef4cba9 in getgl_ /home/ivan/temp/smash/getgl.f:2

  This frame has 4 object(s):
    [32, 36) 'nd'
    [96, 104) 'd2f'
    [160, 168) 'd2u' <== Memory access at offset 168 overflows this variable
    [224, 232) 'd2zeta'
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow /home/ivan/temp/smash/prephi.f:50 in prephi_
Shadow bytes around the buggy address:
  0x1000582fb9c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000582fb9d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000582fb9e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000582fb9f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000582fba00: 00 00 f1 f1 f1 f1 04 f2 f2 f2 f2 f2 f2 f2 00 f2
=>0x1000582fba10: f2 f2 f2 f2 f2 f2 00[f2]f2 f2 f2 f2 f2 f2 00 f2
  0x1000582fba20: f2 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00
  0x1000582fba30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000582fba40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000582fba50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000582fba60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 04
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3