#0  0x00007f2ffb619e37 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
  [Error: ../nptl/sysdeps/unix/sysv/linux/raise.c was not found in source tree]
#1  0x00007f2ffb61b528 in __GI_abort () at abort.c:89
  [Error: abort.c was not found in source tree]
#2  0x00007f2ffb65b7a4 in __libc_message (do_abort=do_abort@entry=1, fmt=fmt@entry=0x7f2ffb764780 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
  [Error: ../sysdeps/posix/libc_fatal.c was not found in source tree]
#3  0x00007f2ffb662db6 in malloc_printerr (ptr=<optimized out>, str=0x7f2ffb764948 "double free or corruption (fasttop)", action=1) at malloc.c:4996
  [Error: malloc.c was not found in source tree]
#4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3840
  [Error: malloc.c was not found in source tree]
#5  0x00000000004027a7 in main ()