#0  0x00007f1f66f27117 in __GI___isnan (x=7.0632779330701141e-304) at ../sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c:28
  [Error: ../sysdeps/ieee754/dbl-64/wordsize-64/s_isnan.c was not found in source tree]
#1  0x00007f1f66f28808 in __GI_sigfillset (set=0xb82) at ../signal/sigfillset.c:33
  [Error: ../signal/sigfillset.c was not found in source tree]
#2  0x0000000000000020 in ?? ()
#3  0x0000000000000000 in ?? ()