marco assert failure: double free or corruption (!prev)

[xtknight]

This happened when changing compositor and DPI settings, but it is not easily reproducible. Hopefully the stack trace can be helpful.

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: marco 1.20.0-2ubuntu0
ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
Uname: Linux 4.15.0-12-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
AssertionMessage: double free or corruption (!prev)
CurrentDesktop: MATE
Date: Sat Mar 24 20:28:50 2018
ExecutablePath: /usr/bin/marco
InstallationDate: Installed on 2018-03-24 (0 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180307.1)
ProcCmdline: marco --replace --no-composite
Signal: 6
SourcePackage: marco
StacktraceTop:
 __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f616115db9a "%s\n") at ../sysdeps/posix/libc_fatal.c:181
 malloc_printerr (str=str@entry=0x7f616115f890 "double free or corruption (!prev)") at malloc.c:5350
 _int_free (have_lock=0, p=0x555a1c1c2c50, av=0x7f6161392c40 <main_arena>) at malloc.c:4281
 __GI___libc_free (mem=0x555a1c1c2c60) at malloc.c:3124
 g_list_foreach () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: marco assert failure: double free or corruption (!prev)
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f616115db9a "%s\n") at ../sysdeps/posix/libc_fatal.c:181
 malloc_printerr (str=str@entry=0x7f616115f890 "double free or corruption (!prev)") at malloc.c:5350
 _int_free (have_lock=0, p=0x555a1c1c2c50, av=0x7f6161392c40 <main_arena>) at malloc.c:4281
 __GI___libc_free (mem=0x555a1c1c2c60) at malloc.c:3124
 g_list_foreach (list=<optimized out>, list@entry=0x555a1bf40520, func=0x7f6162707940 <g_free>, user_data=user_data@entry=0x0) at ../../../../glib/glist.c:1011