Qt Creator crashes when I edit main.cpp

snowflake123

This bug in arch linux looks very similar (Same backtrace).

I installed QT from the ubuntu repository (QTcreator 3.5.1) and it also crashes with the same backtrace.

kshegunov

I don't experience anything of the sort on debian. What kernels/window managers are you running?

snowflake123

$ inxi -Fxz

System: Host: node-Extensa-5620 Kernel: 4.4.0-21-generic x86_64 (64 bit gcc: 5.3.1)
Desktop: Cinnamon 3.0.7 (Gtk 3.18.9-1ubuntu3.1) Distro: Linux Mint 18 Sarah
Machine: System: Acer product: V5-131 v: V2.18
Mobo: Acer model: Mimic v: Type2 - Board Version Bios: Acer v: V2.18 date: 09/02/2013
CPU: Dual core Intel Celeron 1017U (-MCP-) cache: 2048 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 6385
clock speeds: max: 1600 MHz 1: 895 MHz 2: 811 MHz
Graphics: Card: Intel 3rd Gen Core processor Graphics Controller bus-ID: 00:02.0
Display Server: X.Org 1.18.3 drivers: intel (unloaded: fbdev,vesa) Resolution: 1366x768@60.02hz
GLX Renderer: Mesa DRI Intel Ivybridge Mobile GLX Version: 3.0 Mesa 11.2.0 Direct Rendering: Yes
Audio: Card Intel 7 Series/C210 Series Family High Definition Audio Controller
driver: snd_hda_intel bus-ID: 00:1b.0
Sound: Advanced Linux Sound Architecture v: k4.4.0-21-generic
Network: Card-1: Broadcom NetLink BCM57785 Gigabit Ethernet PCIe driver: tg3 v: 3.137 bus-ID: 04:00.0
IF: enp4s0f0 state: down mac: <filter>
Card-2: Ralink RT5370 Wireless Adapter driver: rt2800usb v: 2.3.0 usb-ID: 002-087
IF: wlxc83a35c800d3 state: N/A mac: N/A
Drives: HDD Total Size: 1000.2GB (66.3% used) ID-1: /dev/sda model: TOSHIBA_MQ01ABD1 size: 1000.2GB
Partition: ID-1: / size: 914G used: 615G (71%) fs: ext4 dev: /dev/dm-1
ID-2: /boot size: 472M used: 60M (14%) fs: ext2 dev: /dev/sda1
ID-3: swap-1 size: 3.21GB used: 0.03GB (1%) fs: swap dev: /dev/dm-3
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors: System Temperatures: cpu: 49.0C mobo: N/A
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 278 Uptime: 20 days Memory: 1263.1/7803.9MB Init: systemd runlevel: 5 Gcc sys: 5.4.0
Client: Shell (bash 4.3.421) inxi: 2.2.35

I made some progress. In the arch linux bug report (link above) it is written that if he launches QTcreator as root the issue does not occur. So i tested it. Its true if i launch QTCreater as root it works flawlessly. No seg faults. This might be some sort of permission issue.

I also made a second test, logged out and logged back in in software rendering mode (I was able to run QTCreator in a mint18 virtual machine in software rendering mode without the issue, see above).But in the host system, even in software rendering mode, qtcreator crashes. So this does does not seem to be a graphics driver issue as intially anticipated.

kshegunov

Well, I'm running a 4.6.4 kernel, but if I had to guess the graphics driver would be my top suspect (which is actually strengthened by your virtual machine experiment). Possibly some "security feature" of the distribution ... I remember that with Mint one has to manually edit an OS configuration file just to allow debuggers to attach.

mjsurette

FWIW I'm running Ubuntu 16.04 with no issues on two machines. Nvidia graphics on one Intel on the other.

I installed Qt with the offline installer at qt.io, not the distribution's version. You might want to try that.

Mike

Winz

Same problem with Qt5.7.0 off-line installer
Mint 18 cinnamon 64 bits

Graphics: Card-1: NVIDIA GF119 [NVS 315] bus-ID: 0f:00.0
Card-2: NVIDIA GF119 [NVS 315] bus-ID: 28:00.0
Display Server: X.Org 1.18.3 drivers: nouveau (unloaded: fbdev,vesa)
Resolution: 1920x1200@59.95hz, 1920x1200@59.95hz, 1280x1024@60.02hz
GLX Renderer: Gallium 0.4 on NVD9
GLX Version: 3.0 Mesa 11.2.0 Direct Rendering: Yes

kernel : 4.4.0-21-generic

I noticed that the problem is due to the CppEditor plugin. If you uncheck it, it will not crash anymore

Tschikkn

@seubri Can you please show the output of

lspci -nnk | grep "VGA\|'Kern'\|3D\|Display" -A3

which will show the card and current used kernel-module. If you have an Intel card (no Skylake, but it may also work) you may use UXA instead of SNA.

Open up a terminal, edit the 20-intel.conf with root-access.

sudo nano /usr/share/X11/xorg.conf.d/20-intel.conf

Copy and paste following code and insert it:

Section "Device"
	Identifier	"Intel Graphics"
	Driver		"i915"
	Option		"AccelMethod"  "uxa"
EndSection

and reboot.
There are sometimes (often?) problems with the newer SNA-acceleration. UXA is the old one which seems to be more stable.

@LinuxMint-Users: You are all alone :) Mint is NOT Ubuntu, it is just sharing the base. In some basics, they are equal but I am quite sure that this doesn't match graphics. I do not know what they have changed or edited, so you have to do a research yourself or just try it out.

seubri

@Tschikkn Hi, I'm sorry for not answering you sooner. I appreciate you trying to help.

My problem still remains, and your suggestion did not help, unfortunately. It seemed to make the graphics worse (more unstable).

Here is the output of lspci -nnk | grep "VGA|'Kern'|3D|Display" -A3:

00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530 [8086:191b] (rev 06)
	DeviceName:  Onboard IGD
	Subsystem: Dell HD Graphics 530 [1028:06e4]
	Kernel driver in use: i915
--
01:00.0 3D controller [0302]: NVIDIA Corporation GM107M [GeForce GTX 960M] [10de:139b] (rev ff)
	Kernel modules: nvidiafb, nouveau, nvidia_367, nvidia_367_drm
02:00.0 Network controller [0280]: Broadcom Limited BCM43602 802.11ac Wireless LAN SoC [14e4:43ba] (rev 01)
	Subsystem: Dell BCM43602 802.11ac Wireless LAN SoC [1028:0024]

SGaist

Can you test starting Qt Creator with -noload Welcome as a parameter ?

aevl

I have the same problem on a Linux Mint 17.2 machine (segmentation fault). I have tried all suggestions and found that the problem s gone when I:

run qtcreator as root
OR
remove the cppeditor plugin

Is there already any solution to this problem?

jsulm

@aevl So, "-noload Welcome" does not help?

mrjj

Hi
We are sitting 6 people on Mint 18.1 and have seen none such issues
alt text

This is however in a virtual machine so not using a real nvidia driver
but VGA compatible controller [0300]: VMware SVGA II Adapter [15ad:0405]
( it can run QML apps/openGL is supported)

MikeAmadeo

Hi All,

Qt 4.2.1 crashes at random times on my Lenovo laptop - once when opening a project, often while simply editing a file.

Has anyone found a definitive solution for this?

Thanks,

~ Mike

SGaist

Hi,

The most straightforward would be to test a more recent version of Qt Creator, the current is 4.4.