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v2012: gst_read1.0 coredumps (segfault in libglib-2.0.so)


Thorsten Hirsch

Question

I'm trying to get my webcam working in Citrix Workspace App 20.12, but the gstreamer-1.0 libraries seem to be broken with an up-to-date installation of archlinux. Here's what happens:

➜  ICAClient cd /opt/Citrix/ICAClient/util
➜  util ./gst_read 

(gst_read:39266): GStreamer-WARNING **: 23:09:16.639: free_priv_data: object finalizing but still has parent (object:0x7f447c074240, parent:0x561e59c58d20)

(gst_read:39266): GStreamer-WARNING **: 23:09:16.639: free_priv_data: object finalizing but still has 1 parents (object:0x7f447c074240)

(gst_read:39266): GStreamer-CRITICAL **: 23:09:16.639: gst_mini_object_unlock: assertion 'GST_MINI_OBJECT_IS_LOCKABLE (object)' failed

(gst_read:39266): GStreamer-WARNING **: 23:09:16.755: free_priv_data: object finalizing but still has parent (object:0x7f447c0746c0, parent:0x561e59c58c40)

(gst_read:39266): GStreamer-WARNING **: 23:09:16.755: free_priv_data: object finalizing but still has 1 parents (object:0x7f447c0746c0)

(gst_read:39266): GStreamer-CRITICAL **: 23:09:16.755: gst_mini_object_unlock: assertion 'GST_MINI_OBJECT_IS_LOCKABLE (object)' failed

(gst_read:39266): GStreamer-WARNING **: 23:09:16.883: free_priv_data: object finalizing but still has parent (object:0x7f447c0747e0, parent:0x7f447c03ab60)

(gst_read:39266): GStreamer-WARNING **: 23:09:16.883: free_priv_data: object finalizing but still has 1 parents (object:0x7f447c0747e0)

(gst_read:39266): GStreamer-CRITICAL **: 23:09:16.883: gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed

(gst_read:39266): GStreamer-CRITICAL **: 23:09:16.883: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed

(gst_read:39266): GStreamer-WARNING **: 23:09:17.007: free_priv_data: object finalizing but still has parent (object:0x7f447c074900, parent:0x7f447c03ac40)

(gst_read:39266): GStreamer-WARNING **: 23:09:17.007: free_priv_data: object finalizing but still has 1 parents (object:0x7f447c074900)

(gst_read:39266): GStreamer-CRITICAL **: 23:09:17.007: gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed

(gst_read:39266): GStreamer-CRITICAL **: 23:09:17.007: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed

(gst_read:39266): GStreamer-WARNING **: 23:09:17.131: free_priv_data: object finalizing but still has parent (object:0x7f447c0747e0, parent:0x7f447c03ad20)

(gst_read:39266): GStreamer-WARNING **: 23:09:17.131: free_priv_data: object finalizing but still has 1 parents (object:0x7f447c0747e0)

(gst_read:39266): GStreamer-CRITICAL **: 23:09:17.131: gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed

(gst_read:39266): GStreamer-CRITICAL **: 23:09:17.131: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed

(gst_read:39266): GStreamer-WARNING **: 23:09:17.256: free_priv_data: object finalizing but still has parent (object:0x7f447c074a20, parent:0x7f447c03ae00)

(gst_read:39266): GStreamer-WARNING **: 23:09:17.256: free_priv_data: object finalizing but still has 1 parents (object:0x7f447c074a20)

(gst_read:39266): GStreamer-CRITICAL **: 23:09:17.256: gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed

(gst_read:39266): GStreamer-CRITICAL **: 23:09:17.256: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed
[1]    39266 segmentation fault (core dumped)  ./gst_read

 

There's a bit more info in dmesg:

[ 5763.492509] v4l2src:src[39267]: segfault at e40becf0 ip 00007f4483e40d99 sp 00007f4482851c10 error 4 in libglib-2.0.so.0.6600.4[7f4483dec000+8c000]
[ 5763.492518] Code: 00 00 00 00 49 8b 14 24 48 c7 42 08 00 00 00 00 49 89 6c 24 08 48 8b 15 f5 21 0c 00 4c 89 e5 4c 01 ea 4c 3b 22 74 72 49 89 c4 <49> 8b 34 24 89 cf 48 8b 56 08 89 d0 29 d7 29 c8 39 d1 48 0f 47 c7

 

My system is running Linux 5.10.4 (x64) and I've installed the following gstreamer packages:

 

gstreamer 1.18.2-1
gstreamer-vaapi 1.18.2-1
gstreamermm 1.10.0-2
libcanberra-gstreamer 0.30+2+gc0620e4-3

gst-libav 1.18.2-1

gst-plugin-pipewire 0.3.19-1
gst-plugins-bad 1.18.2-2
gst-plugins-bad-libs 1.18.2-2
gst-plugins-base 1.18.2-1
gst-plugins-base-libs 1.18.2-1
gst-plugins-good 1.18.2-1
gst-plugins-ugly 1.18.2-1

 

 

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  • 0

Here's gdb's full backtrace:

Core was generated by `./gst_read'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f4483e40d99 in ?? () from /usr/lib/libglib-2.0.so.0
[Current thread is 1 (Thread 0x7f4482853640 (LWP 39267))]
(gdb) bt
#0  0x00007f4483e40d99 in  () at /usr/lib/libglib-2.0.so.0
#1  0x00007f4483e41299 in g_slice_free1 () at /usr/lib/libglib-2.0.so.0
#2  0x00007f4483dc296b in gst_app_sink_try_pull_sample () at /usr/lib/libgstapp-1.0.so.0
#3  0x0000561e59403d7d in cb_new_buffer ()
#4  0x00007f4483dbf5ff in  () at /usr/lib/libgstapp-1.0.so.0
#5  0x00007f44836ee7b8 in  () at /usr/lib/libgstbase-1.0.so.0
#6  0x00007f44836bdf81 in  () at /usr/lib/libgstbase-1.0.so.0
#7  0x00007f4483fe6b75 in  () at /usr/lib/libgstreamer-1.0.so.0
#8  0x00007f4483fea1f3 in  () at /usr/lib/libgstreamer-1.0.so.0
#9  0x00007f4483fea61e in gst_pad_push () at /usr/lib/libgstreamer-1.0.so.0
#10 0x00007f4483620b4d in gst_video_encoder_finish_frame () at /usr/lib/libgstvideo-1.0.so.0
#11 0x00007f44840d21b2 in  () at /usr/lib/gstreamer-1.0/libgsttheora.so
#12 0x00007f4483615788 in  () at /usr/lib/libgstvideo-1.0.so.0
#13 0x00007f4483fe6b75 in  () at /usr/lib/libgstreamer-1.0.so.0
#14 0x00007f4483fea1f3 in  () at /usr/lib/libgstreamer-1.0.so.0
#15 0x00007f4483fea61e in gst_pad_push () at /usr/lib/libgstreamer-1.0.so.0
#16 0x00007f44836cba3f in  () at /usr/lib/libgstbase-1.0.so.0
#17 0x00007f4483fe6b75 in  () at /usr/lib/libgstreamer-1.0.so.0
#18 0x00007f4483fea1f3 in  () at /usr/lib/libgstreamer-1.0.so.0
#19 0x00007f4483fea61e in gst_pad_push () at /usr/lib/libgstreamer-1.0.so.0
#20 0x00007f44836cba3f in  () at /usr/lib/libgstbase-1.0.so.0
#21 0x00007f4483fe6b75 in  () at /usr/lib/libgstreamer-1.0.so.0
#22 0x00007f4483fea1f3 in  () at /usr/lib/libgstreamer-1.0.so.0
#23 0x00007f4483fea61e in gst_pad_push () at /usr/lib/libgstreamer-1.0.so.0
#24 0x00007f44836cba3f in  () at /usr/lib/libgstbase-1.0.so.0
#25 0x00007f4483fe6b75 in  () at /usr/lib/libgstreamer-1.0.so.0
#26 0x00007f4483fea1f3 in  () at /usr/lib/libgstreamer-1.0.so.0
#27 0x00007f4483fea61e in gst_pad_push () at /usr/lib/libgstreamer-1.0.so.0
#28 0x00007f44836cfa7e in  () at /usr/lib/libgstbase-1.0.so.0
#29 0x00007f4484010a61 in  () at /usr/lib/libgstreamer-1.0.so.0
#30 0x00007f4483e52d77 in  () at /usr/lib/libglib-2.0.so.0
#31 0x00007f4483e4fec1 in  () at /usr/lib/libglib-2.0.so.0
#32 0x00007f4483d5e3e9 in start_thread () at /usr/lib/libpthread.so.0
#33 0x00007f448394f293 in clone () at /usr/lib/libc.so.6

 

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  • 0

Hi

we have the same issue on Ubuntu 20.04, with the same crash. In my case i see the webcome is comming up for 1 secound and than i lose the connection .

 

I tried gst_read and bekome the same error.

 

(gst_read:115537): GStreamer-WARNING **: 12:22:45.817: free_priv_data: object finalizing but still has parent (object:0x7f08d807b240, parent:0x562b575611c0)
(gst_read:115537): GStreamer-WARNING **: 12:22:45.817: free_priv_data: object finalizing but still has 1 parents (object:0x7f08d807b240)
(gst_read:115537): GStreamer-CRITICAL **: 12:22:45.817: gst_mini_object_unlock: assertion 'GST_MINI_OBJECT_IS_LOCKABLE (object)' failed
(gst_read:115537): GStreamer-CRITICAL **: 12:22:45.817: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed
(gst_read:115537): GStreamer-WARNING **: 12:22:45.883: free_priv_data: object finalizing but still has parent (object:0x7f08d807b6c0, parent:0x562b575610e0)
(gst_read:115537): GStreamer-WARNING **: 12:22:45.883: free_priv_data: object finalizing but still has 1 parents (object:0x7f08d807b6c0)
(gst_read:115537): GStreamer-CRITICAL **: 12:22:45.883: gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed
(gst_read:115537): GStreamer-CRITICAL **: 12:22:45.883: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed
(gst_read:115537): GStreamer-WARNING **: 12:22:45.947: free_priv_data: object finalizing but still has parent (object:0x7f08d807b7e0, parent:0x7f08d80ae870)
(gst_read:115537): GStreamer-WARNING **: 12:22:45.947: free_priv_data: object finalizing but still has 1 parents (object:0x7f08d807b7e0)
(gst_read:115537): GStreamer-CRITICAL **: 12:22:45.947: gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed
(gst_read:115537): GStreamer-CRITICAL **: 12:22:45.947: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed
(gst_read:115537): GStreamer-WARNING **: 12:22:46.015: free_priv_data: object finalizing but still has parent (object:0x7f08d807b900, parent:0x7f08d80ae950)
(gst_read:115537): GStreamer-WARNING **: 12:22:46.015: free_priv_data: object finalizing but still has 1 parents (object:0x7f08d807b900)
(gst_read:115537): GStreamer-CRITICAL **: 12:22:46.015: gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed
(gst_read:115537): GStreamer-CRITICAL **: 12:22:46.015: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed
(gst_read:115537): GStreamer-WARNING **: 12:22:46.083: free_priv_data: object finalizing but still has parent (object:0x7f08d807b7e0, parent:0x7f08d80aea30)
(gst_read:115537): GStreamer-WARNING **: 12:22:46.083: free_priv_data: object finalizing but still has 1 parents (object:0x7f08d807b7e0)
(gst_read:115537): GStreamer-CRITICAL **: 12:22:46.083: gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed
(gst_read:115537): GStreamer-CRITICAL **: 12:22:46.083: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed
(gst_read:115537): GStreamer-WARNING **: 12:22:46.147: free_priv_data: object finalizing but still has parent (object:0x7f08d807ba20, parent:0x7f08d80aeb10)
(gst_read:115537): GStreamer-WARNING **: 12:22:46.147: free_priv_data: object finalizing but still has 1 parents (object:0x7f08d807ba20)
gst_read:115537): GStreamer-CRITICAL **: 12:22:46.147: gst_mini_object_unlock: assertion 'state >= SHARE_ONE' failed
(gst_read:115537): GStreamer-CRITICAL **: 12:22:46.147: gst_mini_object_unref: assertion 'GST_MINI_OBJECT_REFCOUNT_VALUE (mini_object) > 0' failed
 

 

Have you any Workaground for this ?

 

regards

 

Michael

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  • 0

Hi,

i log file in linux come the following error.

 

Feb  2 13:03:14 tn-pc01 WebKitWebProcess[16373]: Memory pressure relief: Total: res = 51118080/51118080/0, res+swap = 47026176/47026176/0
Feb  2 13:03:15 tn-pc01 kernel: [103025.872624] v4l2src:src[119281]: segfault at 62a0163d ip 00007f774ff6aa53 sp 00007f774ebd3c20 error 4 in libglib-2.0.so.0.6400.3[7f774ff17000+84000]
Feb  2 13:03:15 tn-pc01 kernel: [103025.872650] Code: 8b 30 48 c7 46 08 00 00 00 00 4c 89 60 08 48 8b 35 22 83 0b 00 49 89 c4 4c 01 f6 48 8b 1e 48 39 d8 0f 84 80 00 00 00 48 89 c8 <48> 8b 38 41 89 d0 48 8b 77 08 8
9 f1 41 29 f0 29 d1 39 f2 49 0f 47
Feb  2 13:03:28 tn-pc01 WebKitNetworkProcess[16369]: Memory pressure relief: Total: res = 6565888/6565888/0, res+swap = 2326528/2326528/0
Feb  2 13:03:29 tn-pc01 WebKitNetworkProcess[16374]: Memory pressure relief: Total: res = 6840320/6840320/0, res+swap = 2600960/2600960/0
Feb  2 13:03:30 tn-pc01 WebKitWebProcess[16367]: Memory pressure relief: Total: res = 24031232/24031232/0, res+swap = 19369984/19369984/0

 

regards

Michael

 

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  • 0

With version 21.03 the backtrace looks a little bit different, but the problem is basically the same:

(gdb) bt
#0  0x00007ffff7d35b36 in g_slice_alloc () at /usr/lib/libglib-2.0.so.0
#1  0x00007ffff7e9ec1d in gst_buffer_new () at /usr/lib/libgstreamer-1.0.so.0
#2  0x00007ffff7ea0acd in gst_buffer_new_allocate () at /usr/lib/libgstreamer-1.0.so.0
#3  0x00007ffff750b6c2 in gst_video_encoder_allocate_output_frame () at /usr/lib/libgstvideo-1.0.so.0
#4  0x00007ffff7fbe183 in  () at /usr/lib/gstreamer-1.0/libgsttheora.so
#5  0x00007ffff7fbf1b2 in  () at /usr/lib/gstreamer-1.0/libgsttheora.so
#6  0x00007ffff7504728 in  () at /usr/lib/libgstvideo-1.0.so.0
#7  0x00007ffff7edee45 in  () at /usr/lib/libgstreamer-1.0.so.0
#8  0x00007ffff7ee24c3 in  () at /usr/lib/libgstreamer-1.0.so.0
#9  0x00007ffff7ee28ee in gst_pad_push () at /usr/lib/libgstreamer-1.0.so.0
#10 0x00007ffff75baa3f in  () at /usr/lib/libgstbase-1.0.so.0
#11 0x00007ffff7edee45 in  () at /usr/lib/libgstreamer-1.0.so.0
#12 0x00007ffff7ee24c3 in  () at /usr/lib/libgstreamer-1.0.so.0
#13 0x00007ffff7ee28ee in gst_pad_push () at /usr/lib/libgstreamer-1.0.so.0
#14 0x00007ffff75baa3f in  () at /usr/lib/libgstbase-1.0.so.0
#15 0x00007ffff7edee45 in  () at /usr/lib/libgstreamer-1.0.so.0
#16 0x00007ffff7ee24c3 in  () at /usr/lib/libgstreamer-1.0.so.0
#17 0x00007ffff7ee28ee in gst_pad_push () at /usr/lib/libgstreamer-1.0.so.0
#18 0x00007ffff75baa3f in  () at /usr/lib/libgstbase-1.0.so.0
#19 0x00007ffff7edee45 in  () at /usr/lib/libgstreamer-1.0.so.0
#20 0x00007ffff7ee24c3 in  () at /usr/lib/libgstreamer-1.0.so.0
#21 0x00007ffff7ee28ee in gst_pad_push () at /usr/lib/libgstreamer-1.0.so.0
#22 0x00007ffff75bea7e in  () at /usr/lib/libgstbase-1.0.so.0
#23 0x00007ffff7f08e11 in  () at /usr/lib/libgstreamer-1.0.so.0
#24 0x00007ffff7d47137 in  () at /usr/lib/libglib-2.0.so.0
#25 0x00007ffff7d44241 in  () at /usr/lib/libglib-2.0.so.0
#26 0x00007ffff7c50299 in start_thread () at /usr/lib/libpthread.so.0
#27 0x00007ffff783d053 in clone () at /usr/lib/libc.so.6

 

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  • 0
On 6/10/2021 at 8:00 AM, Michael Schwenke1709152772 said:

Hi @All,

 

the new Beta Linux Client Version is Working for me.

Citrix Workspace Ap  21.6.0.13

 

I cane use the WebCam without any Crash.

 

regards

Michael

Hi Michael,

 

thanks for that info. I have wasted plenty of time to get the webcam going util I end up in this forum post. Thought it might have been a configuration issue instead of a bug.

 

It is a little bit of a let down that no Citrix employed responed to this post. As it seems to be a bug they fixed in the upcoming release some feedback would have been nice.

 

Anyhow, thanks for keeping us updated.

 

Regards.

 

Matthias

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