#1012227 webkitgtk: CPU usage is 50% or higher with WebKitWebProcess

Package:
libwebkit2gtk-4.0-37
Source:
webkit2gtk
Description:
Web content engine library for GTK
Submitter:
Tim McConnell
Date:
2022-06-29 19:48:03 UTC
Severity:
important
#1012227#5
Date:
2022-06-01 19:57:30 UTC
From:
To:
Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?Unsure, I've been having this issue for a
while now
   * What exactly did you do (or not do) that was effective (or
     ineffective)? Don't know other than keeping my system up to date
   * What was the outcome of this action? WebKitWebProcess will use 50% of CPU
by itself and will often take the CPU usage to 100%
   * What outcome did you expect instead?Lower CPU usage

*** End of the template - remove these template lines ***
#1012227#10
Date:
2022-06-01 20:08:59 UTC
From:
To:
Forgot screenshots.
#1012227#15
Date:
2022-06-01 20:08:59 UTC
From:
To:
Forgot screenshots.
#1012227#20
Date:
2022-06-02 00:14:55 UTC
From:
To:
Control: reassign -1 libwebkit2gtk-4.0-37
Control: retitle -1 webkitgtk: CPU usage is 50% or higher with WebKitWebProcess

Bugs in WebKit should not be reported against 'general', but against
the appropriate WebKit package, reassigning the bug.

The webkit-help mailing list or the WebKit IRC/Matrix channel can
probably help you figure out why this is occurring and what workarounds
that you might be able to try.

https://webkitgtk.org/
#1012227#29
Date:
2022-06-09 20:59:33 UTC
From:
To:
Dear Maintainer,

running sudo ps -aux |grep WebKitWebProcess
tmick    4071296 53.0  9.5 88411428 683212 ?     RLl  15:38   8:13
/usr/lib/x86_64-linux-gnu/webkit2gtk-4.0/WebKitWebProcess 13 35
tmick    4073180  0.0  0.0   6432  2284 pts/1    T    15:52   0:00 grep
WebKitWebProcess
tmick    4073195  0.0  0.0   6432  2284 pts/1    S+   15:54   0:00 grep
WebKitWebProcess

And stays there until I shutdown everything that uses it. Evolution, TOR,
Firefox and reboot. It's like I'm running Windows 3.11 again.
#1012227#34
Date:
2022-06-09 22:59:48 UTC
From:
To:
Can you please try this?

- Run webkit and identify the PID that is using most of the CPU (using
  top or any similar tool)

- As root run "perf top -pPID --sort dso,symbol"

This will give you the shared libraries and symbols that are eating
the CPU.

Thanks,

Berto
#1012227#39
Date:
2022-06-10 16:27:39 UTC
From:
To:
HI Alberto,
I ran top and got this:
 5533 tmick     20   0   84.3g 620608  60480 R  98.3   8.7   4:36.70
WebKitWebProces
  81329 tmick     20   0  630188  54172  40612 S   3.0   0.8   0:08.15
kgx
   2435 root      20   0  549452  39024   9696 S   2.3   0.5  21:49.73
Suricata-Main
  81228 tmick     20   0   85404  81028  32700 S   2.3   1.1   0:08.00
tor
     26 root      -2   0       0      0      0 S   1.7   0.0  12:28.53
ktimers/1
   5351 tmick     20   0  604232   6988   4304 S   1.7   0.1  12:48.10
conky
     14 root      -2   0       0      0      0 S   1.3   0.0  12:24.36
ktimers/0
  10567 tmick     10 -10  683520  62100  35208 S   1.3   0.9  12:14.97
steam
   4606 tmick     20   0 2714596 100340  19624 S   1.0   1.4   5:16.95
java
   4763 tmick     20   0  617604  63860  37256 S   0.7   0.9   8:34.09
Xwayland
    914 root      20   0  258060  16240  13700 S   0.3   0.2   0:05.96
NetworkManager
  81506 root      20   0   10668   4308   3380 R   0.3   0.1   0:00.13
top
      1 root      20   0  167420  11080   7004 S   0.0   0.2   0:09.06
systemd
      2 root      20   0       0      0      0 S   0.0   0.0   0:00.02
kthreadd
      3 root       0 -20       0      0      0 I   0.0   0.0   0:00.00
rcu_gp
      4 root       0 -20       0      0      0 I   0.0   0.0   0:00.00
rcu_par_gp
      5 root       0 -20       0      0      0 I   0.0   0.0   0:00.00
netns
      9 root       0 -20       0      0      0 I   0.0   0.0   0:00.00
mm_percpu_wq
     10 root      20   0       0      0      0 I   0.0   0.0   0:00.00
rcu_tasks_kthread
     11 root      20   0       0      0      0 I   0.0   0.0   0:00.00
rcu_tasks_rude_kthread
     12 root      20   0       0      0      0 I   0.0   0.0   0:00.00
rcu_tasks_trace_kthread
     13 root      20   0       0      0      0 S   0.0   0.0   1:05.02
ksoftirqd/0


Running sudo perf top -pPID --sort dso,symbol told me gave me
 ┌─Error:─────────────────────────────────────────┐
                                     │Couldn't create thread/CPU maps:
No such process│
                                     │
│
                                     │
│
                                     │Press any key...
│

└────────────────────────────────────────────────┘
Tim
#1012227#44
Date:
2022-06-10 16:34:44 UTC
From:
To:
Here -pPID would have the number of the process that is using the CPU,
in your case

sudo perf top -p5533 --sort dso,symbol

Berto
#1012227#49
Date:
2022-06-10 16:46:36 UTC
From:
To:
   PerfTop:    2757 irqs/sec  kernel: 3.7%  exact:  0.0% lost: 0/0
drop: 0/0 [4000Hz cycles],  (target_pid: 82438)
-----------------------------------------------------------------------
--------

     4.20%  libharfbuzz.so.0.20704.0             [.]
hb_ot_name_get_utf32
     2.62%  libcairo.so.2.11600.0                [.]
cairo_scaled_font_glyph_e
     2.26%  libicuuc.so.71.1                     [.]
icu_71::ComposeNormalizer
     2.09%  libpthread-2.33.so                   [.]
__pthread_mutex_lock
     1.71%  libpthread-2.33.so                   [.]
__pthread_mutex_unlock_us
     1.51%  libicuuc.so.71.1                     [.]
unorm2_isNormalized_71
     1.49%  libicuuc.so.71.1                     [.]
u_getUnicodeProperties_71
     1.46%  libicuuc.so.71.1                     [.] ucase_toupper_71
     1.46%  libicuuc.so.71.1                     [.] u_charType_71
     1.43%  libjavascriptcoregtk-4.0.so.18.20.7  [.]
Gigacage::addPrimitiveDis
     1.29%  libjavascriptcoregtk-4.0.so.18.20.7  [.] WTF::normalizedNFC
     1.28%  libcairo.so.2.11600.0                [.]
cairo_font_options_get_va
     1.18%  libc-2.33.so                         [.] _int_malloc
     1.00%  libpthread-2.33.so                   [.]
pthread_getspecific
     0.96%  libc-2.33.so                         [.] _int_free
     0.93%  libicuuc.so.71.1                     [.]
icu_71::EmojiProps::hasBi
     0.89%  libicuuc.so.71.1                     [.]
icu_71::EmojiProps::hasBi
     0.88%  libicuuc.so.71.1                     [.]
icu_71::UnicodeString::cl
     0.88%  libjavascriptcoregtk-4.0.so.18.20.7  [.] WTF::fastMalloc
     0.85%  libharfbuzz.so.0.20704.0             [.]
hb_segment_properties_has
#1012227#54
Date:
2022-06-10 19:25:28 UTC
From:
To:
I had a better idea, and piped it to the attached file and let it run
until the CPU usage went down. Currently my CPU is between 9 - 15 %
Sorry for the big file, it took a while.
Tim
#1012227#59
Date:
2022-06-10 21:51:43 UTC
From:
To:
Ok, it looks like it's just drawing text all the time, do you have any
particular website or page open, or when does this happen?

Berto
#1012227#64
Date:
2022-06-10 22:12:52 UTC
From:
To:
So when that was done all I had running was Evolution, Selektor, my VPN
. It was impossible to read email, (Nothing would open unless I double
clicked it) but even if I shut down Evolution it stays around 50 % CPU
usage and if I just let it fight it's way through it and comeback later
it does the same thing, Something is going wrong, I have no idea why or
what. 
#1012227#69
Date:
2022-06-11 18:21:48 UTC
From:
To:
This might seem like a stupid question, however; I noticed that when
the CPU was at 100% usage WebKitWebProcess had two PIDs. If I can get
it to do it again so I need to run the command for each PID or can I
run sudo perf top -pPID1 -pPID2 --sort dso,symbol?
Thanks!
Tim
#1012227#74
Date:
2022-06-15 17:52:28 UTC
From:
To:
Sorry I thought I had replied to this and I didn't. All I'm doing when
this happens is checking my local email (log file reports etc) in
Evolution. It doesn't do it when I check gmail though. and strangely
enough, it only does it if the PC sits over night, with Evolution open.
So like if I check email first thing in the morning, the rest of the
day it's fine. 
Tim
#1012227#79
Date:
2022-06-25 17:00:12 UTC
From:
To:
Update: Evolution mailing list gave me this command to run: gdb --batch
--ex "t a a bt" --pid=27250 &>>~/bt.txt. I've attached it to this
email. Hope it helps.
#1012227#84
Date:
2022-06-26 18:56:38 UTC
From:
To:
Hi Berto,
As an FYI I sent a question about this to the Evolution mailing list
and was told to run this command.
gdb --batch --ex "t a a bt" --pid=27250 &>>~/bt.txt
Here's the output (it does it when I'm in Evoution->On This Computer -

[New LWP 27261]
[New LWP 27265]
[New LWP 27267]
[New LWP 27278]
[New LWP 27281]
[New LWP 27282]
[New LWP 27283]
[New LWP 27317]
[New LWP 27320]
[New LWP 27321]
[New LWP 27322]

warning: .dynamic section for "/lib/x86_64-linux-gnu/libgnutls.so.30"
is not at the expected address (wrong library or version mismatch?)
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-
gnu/libthread_db.so.1".
0x00007f013000a87f in __GI___poll (fds=0x55648400ae00, nfds=2,
timeout=29685) at ../sysdeps/unix/sysv/linux/poll.c:29
29	../sysdeps/unix/sysv/linux/poll.c: No such file or directory.

Thread 12 (Thread 0x7f0078eaa640 (LWP 27322) "WebKitWe:shlo0"):
#0  0x00007f012be280fa in __futex_abstimed_wait_common64
(futex_word=futex_word@entry=0x556484224898, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0, cancel=cancel@entry=true) at
../sysdeps/nptl/futex-internal.c:74
#1  0x00007f012be2815b in __GI___futex_abstimed_wait_cancelable64
(futex_word=futex_word@entry=0x556484224898, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0) at ../sysdeps/nptl/futex-internal.c:123
#2  0x00007f012be21c30 in __pthread_cond_wait_common (abstime=0x0,
clockid=0, mutex=0x556484224848, cond=0x556484224870) at
pthread_cond_wait.c:504
#3  __pthread_cond_wait (cond=0x556484224870, mutex=0x556484224848) at
pthread_cond_wait.c:619
#4  0x00007f00cdf4048b in  () at /usr/lib/x86_64-linux-
gnu/dri/radeonsi_dri.so
#5  0x00007f00cdf400d7 in  () at /usr/lib/x86_64-linux-
gnu/dri/radeonsi_dri.so
#6  0x00007f012be1bd80 in start_thread (arg=0x7f0078eaa640) at
pthread_create.c:481
#7  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f00796ab640 (LWP 27321) "WebKitWebP:sh0"):
#0  0x00007f012be280fa in __futex_abstimed_wait_common64
(futex_word=futex_word@entry=0x556484224328, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0, cancel=cancel@entry=true) at
../sysdeps/nptl/futex-internal.c:74
#1  0x00007f012be2815b in __GI___futex_abstimed_wait_cancelable64
(futex_word=futex_word@entry=0x556484224328, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0) at ../sysdeps/nptl/futex-internal.c:123
#2  0x00007f012be21c30 in __pthread_cond_wait_common (abstime=0x0,
clockid=0, mutex=0x5564842242d8, cond=0x556484224300) at
pthread_cond_wait.c:504
#3  __pthread_cond_wait (cond=0x556484224300, mutex=0x5564842242d8) at
pthread_cond_wait.c:619
#4  0x00007f00cdf4048b in  () at /usr/lib/x86_64-linux-
gnu/dri/radeonsi_dri.so
#5  0x00007f00cdf400d7 in  () at /usr/lib/x86_64-linux-
gnu/dri/radeonsi_dri.so
#6  0x00007f012be1bd80 in start_thread (arg=0x7f00796ab640) at
pthread_create.c:481
#7  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f00cc87b640 (LWP 27320) "WebKitW:disk$0"):
#0  0x00007f012be280fa in __futex_abstimed_wait_common64
(futex_word=futex_word@entry=0x556483f44708, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0, cancel=cancel@entry=true) at
../sysdeps/nptl/futex-internal.c:74
#1  0x00007f012be2815b in __GI___futex_abstimed_wait_cancelable64
(futex_word=futex_word@entry=0x556483f44708, expected=expected@entry=0,
clockid=clockid@entry=0, abstime=abstime@entry=0x0,
private=private@entry=0) at ../sysdeps/nptl/futex-internal.c:123
#2  0x00007f012be21c30 in __pthread_cond_wait_common (abstime=0x0,
clockid=0, mutex=0x556483f446b8, cond=0x556483f446e0) at
pthread_cond_wait.c:504
#3  __pthread_cond_wait (cond=0x556483f446e0, mutex=0x556483f446b8) at
pthread_cond_wait.c:619
#4  0x00007f00cdf4048b in  () at /usr/lib/x86_64-linux-
gnu/dri/radeonsi_dri.so
#5  0x00007f00cdf400d7 in  () at /usr/lib/x86_64-linux-
gnu/dri/radeonsi_dri.so
#6  0x00007f012be1bd80 in start_thread (arg=0x7f00cc87b640) at
pthread_create.c:481
#7  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f00cfffd640 (LWP 27317) "ReceiveQueue"):
#0  0x00007f013000a87f in __GI___poll (fds=0x556483fabb50, nfds=2,
timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f012fb581ee in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f012fb58543 in g_main_loop_run () at /lib/x86_64-linux-
gnu/libglib-2.0.so.0
#3  0x00007f012f7137c0 in WTF::RunLoop::run() () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#4  0x00007f012f6b98ca in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#5  0x00007f012f716339 in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#6  0x00007f012be1bd80 in start_thread (arg=0x7f00cfffd640) at
pthread_create.c:481
#7  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f0124ffd640 (LWP 27283) "ReceiveQueue"):
#0  0x00007f013000a87f in __GI___poll (fds=0x7f00c0002ec0, nfds=2,
timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f012fb581ee in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f012fb58543 in g_main_loop_run () at /lib/x86_64-linux-
gnu/libglib-2.0.so.0
#3  0x00007f012f7137c0 in WTF::RunLoop::run() () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#4  0x00007f012f6b98ca in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#5  0x00007f012f716339 in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#6  0x00007f012be1bd80 in start_thread (arg=0x7f0124ffd640) at
pthread_create.c:481
#7  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f01257fe640 (LWP 27282) "rruptDispatcher"):
#0  0x00007f013000a87f in __GI___poll (fds=0x7f00c8002a90, nfds=1,
timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f012fb581ee in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f012fb58543 in g_main_loop_run () at /lib/x86_64-linux-
gnu/libglib-2.0.so.0
#3  0x00007f012f7137c0 in WTF::RunLoop::run() () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#4  0x00007f012f6b98ca in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#5  0x00007f012f716339 in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#6  0x00007f012be1bd80 in start_thread (arg=0x7f01257fe640) at
pthread_create.c:481
#7  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f0125fff640 (LWP 27281) "EventDispatcher"):
#0  0x00007f013000a87f in __GI___poll (fds=0x7f01140026a0, nfds=1,
timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f012fb581ee in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f012fb58543 in g_main_loop_run () at /lib/x86_64-linux-
gnu/libglib-2.0.so.0
#3  0x00007f012f7137c0 in WTF::RunLoop::run() () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#4  0x00007f012f6b98ca in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#5  0x00007f012f716339 in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#6  0x00007f012be1bd80 in start_thread (arg=0x7f0125fff640) at
pthread_create.c:481
#7  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f01269c8640 (LWP 27278) "BMScavenger"):
#0  0x00007f012be280fa in __futex_abstimed_wait_common64
(futex_word=futex_word@entry=0x7f012faffdac
<bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s
_memory+76>, expected=expected@entry=0, clockid=clockid@entry=0,
abstime=abstime@entry=0x0, private=private@entry=0,
cancel=cancel@entry=true) at ../sysdeps/nptl/futex-internal.c:74
#1  0x00007f012be2815b in __GI___futex_abstimed_wait_cancelable64
(futex_word=futex_word@entry=0x7f012faffdac
<bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s
_memory+76>, expected=expected@entry=0, clockid=clockid@entry=0,
abstime=abstime@entry=0x0, private=private@entry=0) at
../sysdeps/nptl/futex-internal.c:123
#2  0x00007f012be21c30 in __pthread_cond_wait_common (abstime=0x0,
clockid=0, mutex=0x55648400f140, cond=0x7f012faffd80
<bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s
_memory+32>) at pthread_cond_wait.c:504
#3  __pthread_cond_wait (cond=0x7f012faffd80
<bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s
_memory+32>, mutex=0x55648400f140) at pthread_cond_wait.c:619
#4  0x00007f012f7242db in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#5  0x00007f012f724619 in  () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#6  0x00007f012c0789d3 in  () at /lib/x86_64-linux-gnu/libstdc++.so.6
#7  0x00007f012be1bd80 in start_thread (arg=0x7f01269c8640) at
pthread_create.c:481
#8  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f01273fa640 (LWP 27267) "gdbus"):
#0  0x00007f013000a87f in __GI___poll (fds=0x7f011800d660, nfds=4,
timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f012fb581ee in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f012fb58543 in g_main_loop_run () at /lib/x86_64-linux-
gnu/libglib-2.0.so.0
#3  0x00007f012fdbdcf6 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f012fb8259d in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f012be1bd80 in start_thread (arg=0x7f01273fa640) at
pthread_create.c:481
#6  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f0127bfb640 (LWP 27265) "dconf worker"):
#0  0x00007f013000a87f in __GI___poll (fds=0x556483f72a40, nfds=1,
timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f012fb581ee in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f012fb5830f in g_main_context_iteration () at /lib/x86_64-
linux-gnu/libglib-2.0.so.0
#3  0x00007f0133c0f3bd in  () at /usr/lib/x86_64-linux-
gnu/gio/modules/libdconfsettings.so
#4  0x00007f012fb8259d in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f012be1bd80 in start_thread (arg=0x7f0127bfb640) at
pthread_create.c:481
#6  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f0128c83640 (LWP 27261) "gmain"):
#0  0x00007f013000a87f in __GI___poll (fds=0x556483f56930, nfds=1,
timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f012fb581ee in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f012fb5830f in g_main_context_iteration () at /lib/x86_64-
linux-gnu/libglib-2.0.so.0
#3  0x00007f012fb58361 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f012fb8259d in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f012be1bd80 in start_thread (arg=0x7f0128c83640) at
pthread_create.c:481
#6  0x00007f013001676f in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f012d033000 (LWP 27250) "WebKitWebProces"):
#0  0x00007f013000a87f in __GI___poll (fds=0x55648400ae00, nfds=2,
timeout=29685) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f012fb581ee in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f012fb58543 in g_main_loop_run () at /lib/x86_64-linux-
gnu/libglib-2.0.so.0
#3  0x00007f012f7137c0 in WTF::RunLoop::run() () at /lib/x86_64-linux-
gnu/libjavascriptcoregtk-4.0.so.18
#4  0x00007f0130f11d81 in  () at /lib/x86_64-linux-gnu/libwebkit2gtk-
4.0.so.37
#5  0x00007f012ff3f7fd in __libc_start_main (main=0x55648314b050,
argc=3, argv=0x7ffe9e9fa728, init=<optimized out>, fini=<optimized
out>, rtld_fini=<optimized out>, stack_end=0x7ffe9e9fa718) at
../csu/libc-start.c:332
#6  0x000055648314b08a in  ()
[Inferior 1 (process 27250) detached]

Hope that helps?
Tim