Public bug reported:
The console output:
```
$ gthumb
** (gthumb:87867): WARNING **: 10:55:43.072: Invalid thumbnailer:
missing Exec key
** (gthumb:87867): WARNING **: 10:55:43.072: Invalid thumbnailer: missing Exec
key
** (gthumb:87867): WARNING **: 10:55:43.096: Invalid thumbnailer: missing Exec
key
** (gthumb:87867): WARNING **: 10:55:43.096: Invalid thumbnailer: missing Exec
key
realloc(): invalid pointer
Aborted (core dumped)
```
Console output when I did strace:
```
$ strace -o gthumb.strace.txt gthumb
** (gthumb:89344): WARNING **: 10:57:58.057: Invalid thumbnailer:
missing Exec key
** (gthumb:89344): WARNING **: 10:57:58.058: Invalid thumbnailer: missing Exec
key
** (gthumb:89344): WARNING **: 10:57:58.098: Invalid thumbnailer: missing Exec
key
** (gthumb:89344): WARNING **: 10:57:58.099: Invalid thumbnailer: missing Exec
key
free(): invalid next size (fast)
Aborted (core dumped)
```
I have turned off the "Exec key" of evince thumbnailer if it matter.
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gthumb 3:3.8.0-2.1build1
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.6
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: LXDE
Date: Tue Aug 18 10:56:22 2020
EcryptfsInUse: Yes
SourcePackage: gthumb
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gthumb (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
** Attachment added: "gthumb.strace.txt"
https://bugs.launchpad.net/bugs/1891991/+attachment/5402389/+files/gthumb.strace.txt
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https://bugs.launchpad.net/bugs/1891991
Title:
gthumb crashes ("realloc(): invalid pointer" or "free(): invalid next
size (fast)") (Ubuntu 20.04)
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