I have small application that I used to pull some data periodically from local server.

This code was used while back on older version of Qt (It was one of 5.x releases). Yesterday I rebuild with 5.9.5 and after starting and some time time processing I got this on my screen.

The application did not exit. I will try to see if I can get more information and add later

<--- Last few GCs --->

[1:0x17cec10] 13004609 ms: Mark-sweep 1.6 (7.0) -> 1.6 (6.5) MB, 1.0 / 143.6 ms (+ 2.0 ms in 4 steps since start of marking, biggest step 1.3 ms, walltime since start of marking 147 ms) finalize incremental marking via task GC in old space requested
[1:0x17cec10] 13018785 ms: Mark-sweep 2.6 (7.0) -> 1.6 (7.0) MB, 1.1 / 0.0 ms (+ 2.4 ms in 4 steps since start of marking, biggest step 1.6 ms, walltime since start of marking 4 ms) finalize incremental marking via task GC in old space requested

<--- JS stacktrace --->

Received signal 4 ILL_ILLOPN 7f3ca4f69aa5
#0 0x7f3ca33ca88e <unknown>
#1 0x7f3ca33cac49 <unknown>
#2 0x7f3c9fafb390 <unknown>
#3 0x7f3ca4f69aa5 <unknown>
#4 0x7f3ca415d9be <unknown>
#5 0x7f3ca415dc2f <unknown>
#6 0x7f3ca435e12e <unknown>
#7 0x7f3ca435ebc3 <unknown>
#8 0x7f3ca435f2ae <unknown>
#9 0x7f3ca4360e70 <unknown>
#10 0x7f3ca4341edf <unknown>
#11 0x7f3ca3440159 <unknown>
#12 0x7f3ca4e493f2 <unknown>
#13 0x7f3ca4e49d7f <unknown>
#14 0x7f3ca3440159 <unknown>
#15 0x7f3ca33e4ad0 <unknown>
#16 0x7f3ca33e670d <unknown>
#17 0x7f3ca33e6bc5 <unknown>
#18 0x7f3ca33e7a59 <unknown>
#19 0x7f3ca33e3bf2 <unknown>
#20 0x7f3ca340032a <unknown>
#21 0x7f3ca4bdefaa <unknown>
#22 0x7f3ca33a7cf8 <unknown>
#23 0x7f3ca33a82a2 <unknown>
#24 0x7f3ca33a2311 <unknown>
#25 0x7f3ca2ac7299 QtWebEngine::processMain()
#26 0x000000400bcd <unknown>
#27 0x7f3c9ee9f830 __libc_start_main
#28 0x000000400c39 <unknown>
r8: 00007f3c8c000868 r9: 0000000000000c40 r10: 0000000000000025 r11: 00007f3c8c000868
r12: 00007f3ca74d44bf r13: 00007f3ca74d44bf r14: 00000000017cec30 r15: 00000000017cec30
di: 00000000017c00e0 si: 00007f3ca431a960 bp: 00000000017cec10 bx: 0000000000000000
dx: 0000000001000000 ax: 000000000000004b cx: 0000000000000000 sp: 00007ffe327c8ca0
ip: 00007f3ca4f69aa5 efl: 0000000000010207 cgf: 002b000000000033 erf: 0000000000000000
trp: 0000000000000006 msk: 0000000000000000 cr2: 0000000000000000
[end of stack trace]