QWaitCondition::wait(): mutex unlock failure: Operation not permitted

Hi. I am using the "Image" QML item for show small picture about 30 kb.

I changes the source 5 times per second. After 1 hour and 44 minutes the application doesn't work. QTimer is stoped. 

log is following:

currentTime QTime("01:44:54.702")
currentTime QTime("01:44:54.807")
currentTime QTime("01:44:55.006")
currentTime QTime("01:44:55.205")
QWaitCondition::wait(): mutex unlock failure: Operation not permitted
QWaitCondition::wait(): cv wait failure: Invalid argument
currentTime QTime("01:44:55.403")

If I using image file with big size (about 5-6 Mb) it will happend after 5-7 minutes.

"Lt" command shows the following

test_pixmap 0x0000000000800000/0x0000000000800000
0xffffffa03e50e000 pending 127 0x0000000000006320/0x0000000000060000 0.20% Initial
0xffffffa03ed08000 pending 128 0x0000000000000150/0x0000000000003c70 0.00% PosixServer
0xffffffa03ed04000 pending 254 0x0000000000000288/0x0000000000000d88 0.00% OSAAgent
0xffffffa03ecd1000 pending 127 0x0000000000012f10/0x0000000000020c70 0.00% QQmlThread
0xffffffa03e5a9000 pending 127 0x0000000000001c20/0x0000000000003c70 0.00% EGLopenwf updater
0xffffffa03e580000 pending 127 0x000000000000d330/0x0000000000020c70 0.04% QSGRenderThread

Source code, "lt" log are attached