qbittorrent crashes with SIGSEGV shortly after start if seeding or checking existing files

[Dmitry-a-durnev]

Start qbittorrent with some torrents, it starts checking existing files. After some time (several seconds or minutes) it crashes with:

*************************************************************
Please file a bug report at http://bug.qbittorrent.org and provide the following information:

qBittorrent version: v4.1.7

Caught signal: SIGSEGV
Stack trace:
  /lib/x86_64-linux-gnu/libc.so.6 : cfree()+0x20 [0x7fe7949ef8d0]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0x18d694 [0x7fe7964ad694]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0xd5e6d [0x7fe7963f5e6d]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0x229f81 [0x7fe796549f81]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0x33aa9f [0x7fe79665aa9f]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0x33a868 [0x7fe79665a868]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0x318534 [0x7fe796638534]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0x319088 [0x7fe796639088]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0x31a2c3 [0x7fe79663a2c3]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0x31b30a [0x7fe79663b30a]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0xc2405 [0x7fe7963e2405]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0xe112d [0x7fe79640112d]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0x1ebbdc [0x7fe79650bbdc]
  /usr/lib/x86_64-linux-gnu/libtorrent-rasterbar.so.9 : ()+0xf13b4 [0x7fe7964113b4]
  /lib/x86_64-linux-gnu/libpthread.so.0 : ()+0x9669 [0x7fe796306669]
  /lib/x86_64-linux-gnu/libc.so.6 : clone()+0x43 [0x7fe794a74333]

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: qbittorrent 4.1.7-1ubuntu3
ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
Uname: Linux 5.4.0-12-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Feb 5 23:31:31 2020
ExecutablePath: /usr/bin/qbittorrent
InstallationDate: Installed on 2016-01-16 (1481 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160116)
ProcEnviron:
 LANG=ru_RU.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
 LANGUAGE=ru
SourcePackage: qbittorrent
UpgradeStatus: Upgraded to focal on 2019-11-08 (89 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.