Double free() (probably in ye olde mw-script)

*** glibc detected *** mw: double free or corruption (fasttop): 0x00007fe0639a8260 *** ======= Backtrace: ========= /lib/x86_64-linux-gnu/libc.so.6(+0x75bb6)[0x7fe060d54bb6] /lib/x86_64-linux-gnu/libc.so.6(cfree+0x6c)[0x7fe060d5995c] mw(+0x2d445)[0x7fe062b2c445] mw(+0x2820b)[0x7fe062b2720b] mw(+0x2bacf)[0x7fe062b2aacf] mw(+0x2820b)[0x7fe062b2720b] mw(+0x28a53)[0x7fe062b27a53] mw(+0x1a218)[0x7fe062b19218] mw(main+0xd85)[0x7fe062b0dc55] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd)[0x7fe060cfdead] mw(+0xf0a9)[0x7fe062b0e0a9] ======= Memory map: ======== 7fe058000000-7fe058021000 rw-p 00000000 00:00 0 7fe058021000-7fe05c000000 ---p 00000000 00:00 0 7fe05dc6b000-7fe05dc80000 r-xp 00000000 08:01 1320784 /lib/x86_64-linux-gnu/libgcc_s.so.1 7fe05dc80000-7fe05de80000 ---p 00015000 08:01 1320784 /lib/x86_64-linux-gnu/libgcc_s.so.1 7fe05de80000-7fe05de81000 rw-p 00015000 08:01 1320784 /lib/x86_64-linux-gnu/libgcc_s.so.1 7fe05de81000-7fe05e118000 r--p 00000000 08:01 132117 /usr/lib/locale/locale-archive 7fe05e118000-7fe05e11b000 r-xp 00000000 08:01 1314725 /lib/x86_64-linux-gnu/libgpg-error.so.0.8.0 7fe05e11b000-7fe05e31a000 ---p 00003000 08:01 1314725 /lib/x86_64-linux-gnu/libgpg-error.so.0.8.0 7fe05e31a000-7fe05e31b000 rw-p 00002000 08:01 1314725 /lib/x86_64-linux-gnu/libgpg-error.so.0.8.0 7fe05e31b000-7fe05e32c000 r-xp 00000000 08:01 1585657 /usr/lib/x86_64-linux-gnu/libp11-kit.so.0.0.0 7fe05e32c000-7fe05e52b000 ---p 00011000 08:01 1585657 /usr/lib/x86_64-linux-gnu/libp11-kit.so.0.0.0 7fe05e52b000-7fe05e52c000 r--p 00010000 08:01 1585657 /usr/lib/x86_64-linux-gnu/libp11-kit.so.0.0.0 7fe05e52c000-7fe05e52d000 rw-p 00011000 08:01 1585657 /usr/lib/x86_64-linux-gnu/libp11-kit.so.0.0.0 7fe05e52d000-7fe05e53d000 r-xp 00000000 08:01 1574486 /usr/lib/x86_64-linux-gnu/libtasn1.so.3.1.16 7fe05e53d000-7fe05e73c000 ---p 00010000 08:01 1574486 /usr/lib/x86_64-linux-gnu/libtasn1.so.3.1.16 7fe05e73c000-7fe05e73d000 r--p 0000f000 08:01 1574486 /usr/lib/x86_64-linux-gnu/libtasn1.so.3.1.16 7fe05e73d000-7fe05e73e000 rw-p 00010000 08:01 1574486 /usr/lib/x86_64-linux-gnu/libtasn1.so.3.1.16 7fe05e73e000-7fe05e741000 r-xp 00000000 08:01 1312785 /lib/x86_64-linux-gnu/libkeyutils.so.1.4 7fe05e741000-7fe05e940000 ---p 00003000 08:01 1312785 /lib/x86_64-linux-gnu/libkeyutils.so.1.4 7fe05e940000-7fe05e941000 r--p 00002000 08:01 1312785 /lib/x86_64-linux-gnu/libkeyutils.so.1.4 7fe05e941000-7fe05e942000 rw-p 00003000 08:01 1312785 /lib/x86_64-linux-gnu/libkeyutils.so.1.4 7fe05e942000-7fe05e94a000 r-xp 00000000 08:01 1575205 /usr/lib/x86_64-linux-gnu/libkrb5support.so.0.1 7fe05e94a000-7fe05eb49000 ---p 00008000 08:01 1575205 /usr/lib/x86_64-linux-gnu/libkrb5support.so.0.1 7fe05eb49000-7fe05eb4a000 r--p 00007000 08:01 1575205 /usr/lib/x86_64-linux-gnu/libkrb5support.so.0.1 7fe05eb4a000-7fe05eb4b000 rw-p 00008000 08:01 1575205 /usr/lib/x86_64-linux-gnu/libkrb5support.so.0.1 7fe05eb4b000-7fe05eb4e000 r-xp 00000000 08:01 1313285 /lib/x86_64-linux-gnu/libcom_err.so.2.1 7fe05eb4e000-7fe05ed4d000 ---p 00003000 08:01 1313285 /lib/x86_64-linux-gnu/libcom_err.so.2.1 7fe05ed4d000-7fe05ed4e000 r--p 00002000 08:01 1313285 /lib/x86_64-linux-gnu/libcom_err.so.2.1 7fe05ed4e000-7fe05ed4f000 rw-p 00003000 08:01 1313285 /lib/x86_64-linux-gnu/libcom_err.so.2.1 7fe05ed4f000-7fe05ed75000 r-xp 00000000 08:01 1575065 /usr/lib/x86_64-linux-gnu/libk5crypto.so.3.1 7fe05ed75000-7fe05ef75000 ---p 00026000 08:01 1575065 /usr/lib/x86_64-linux-gnu/libk5crypto.so.3.1 7fe05ef75000-7fe05ef76000 r--p 00026000 08:01 1575065 /usr/lib/x86_64-linux-gnu/libk5crypto.so.3.1 7fe05ef76000-7fe05ef77000 rw-p 00027000 08:01 1575065 /usr/lib/x86_64-linux-gnu/libk5crypto.so.3.1 7fe05ef77000-7fe05ef78000 rw-p 00000000 00:00 0 7fe05ef78000-7fe05f041000 r-xp 00000000 08:01 1574836 /usr/lib/x86_64-linux-gnu/libkrb5.so.3.3 7fe05f041000-7fe05f240000 ---p 000c9000 08:01 1574836 /usr/lib/x86_64-linux-gnu/libkrb5.so.3.3 7fe05f240000-7fe05f24a000 r--p 000c8000 08:01 1574836 /usr/lib/x86_64-linux-gnu/libkrb5.so.3.3 7fe05f24a000-7fe05f24c000 rw-p 000d2000 08:01 1574836 /usr/lib/x86_64-linux-gnu/libkrb5.so.3.3 7fe05f24c000-7fe05f266000 r-xp 00000000 08:01 1575855 /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25 7fe05f266000-7fe05f465000 ---p 0001a000 08:01 1575855 /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25 7fe05f465000-7fe05f466000 r--p 00019000 08:01 1575855 /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25 7fe05f466000-7fe05f467000 rw-p 0001a000 08:01 1575855 /usr/lib/x86_64-linux-gnu/libsasl2.so.2.0.25 7fe05f467000-7fe05f47a000 r-xp 00000000 08:01 1314312 /lib/x86_64-linux-gnu/libresolv-2.13.so 7fe05f47a000-7fe05f679000 ---p 00013000 08:01 1314312 /lib/x86_64-linux-gnu/libresolv-2.13.so 7fe05f679000-7fe05f67a000 r--p 00012000 08:01 1314312 /lib/x86_64-linux-gnu/libresolv-2.13.so 7fe05f67a000-7fe05f67b000 rw-p 00013000 08:01 1314312 /lib/x86_64-linux-gnu/libresolv-2.13.so 7fe05f67b000-7fe05f67d000 rw-p 00000000 00:00 0 7fe05f67d000-7fe05f696000 r-xp 00000000 08:01 1575705 /usr/lib/x86_64-linux-gnu/librtmp.so.0 7fe05f696000-7fe05f896000 ---p 00019000 08:01 1575705 /usr/lib/x86_64-linux-gnu/librtmp.so.0 7fe05f896000-7fe05f897000 rw-p 00019000 08:01 1575705 /usr/lib/x86_64-linux-gnu/librtmp.so.0 7fe05f897000-7fe05f912000 r-xp 00000000 08:01 1311876 /lib/x86_64-linux-gnu/libgcrypt.so.11.7.0 7fe05f912000-7fe05fb12000 ---p 0007b000 08:01 1311876 /lib/x86_64-linux-gnu/libgcrypt.so.11.7.0 7fe05fb12000-7fe05fb13000 r--p 0007b000 08:01 1311876 /lib/x86_64-linux-gnu/libgcrypt.so.11.7.0 7fe05fb13000-7fe05fb16000 rw-p 0007c000 08:01 1311876 /lib/x86_64-linux-gnu/libgcrypt.so.11.7.0 7fe05fb16000-7fe05fbcf000 r-xp 00000000 08:01 1574990 /usr/lib/x86_64-linux-gnu/libgnutls.so.26.22.4 7fe05fbcf000-7fe05fdce000 ---p 000b9000 08:01 1574990 /usr/lib/x86_64-linux-gnu/libgnutls.so.26.22.4 7fe05fdce000-7fe05fdd4000 r--p 000b8000 08:01 1574990 /usr/lib/x86_64-linux-gnu/libgnutls.so.26.22.4 7fe05fdd4000-7fe05fdd6000 rw-p 000be000 08:01 1574990 /usr/lib/x86_64-linux-gnu/libgnutls.so.26.22.4 7fe05fdd6000-7fe05fe13000 r-xp 00000000 08:01 1575119 /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2.2 7fe05fe13000-7fe060013000 ---p 0003d000 08:01 1575119 /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2.2 7fe060013000-7fe060014000 r--p 0003d000 08:01 1575119 /usr/lib/x86_64-linux-gnu/libgssapi_krb5.so.2.2