Public bug reported:
Ubuntu 18.04 LTS
Session: gnome-flashback
Tested with: gnome-panel: 3.26.0-1ubuntu5 / 3.28.0-1ubuntu1 (cosmic)
We recognized a steady CPU load of about 2% when starting our QT4 tray
application. To eliminate any issues in our application, we created a
minimal python qt4 tray app (attached).
As soon as this app is started, the gnome-panel process gets a CPU load of
about 2%.
When stracing the gnome-panel, we recognize a repeating log pattern:
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3,
0) = 0 (Timeout)
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\212\5\4\0f\26 \0\0\0\26\0\26\0\2\0\217\3\4\0U\1 \0f\26
\0\0\0\0\0"..., iov_len=40}, {iov_base=NULL, iov_len=0}, {iov_base="",
iov_len=0}], 3) = 40
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3,
13) = 0 (Timeout)
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="5 \4\0g\26 \0\3\0 \0\26\0\2\0\213\4\6\0h\26 \0g\26
\0&\0\0\0"..., iov_len=236}, {iov_base=NULL, iov_len=0}, {iov_base="",
iov_len=0}], 3) = 236
recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="[\2\353kT\1 \0U\1
\0\200)y\0\0\0\26\0\26\0\2\0\n\5h\3\26\0\30\0", iov_len=4096}], msg_iovlen=1,
msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3,
0) = 0 (Timeout)
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="\212\5\4\0i\26 \0\0\0\26\0\26\0\2\0\217\3\4\0U\1 \0i\26
\0\0\0\0\0"..., iov_len=40}, {iov_base=NULL, iov_len=0}, {iov_base="",
iov_len=0}], 3) = 40
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3,
13) = 0 (Timeout)
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{iov_base="5 \4\0j\26 \0\3\0 \0\26\0\2\0\213\4\6\0k\26 \0j\26
\0&\0\0\0"..., iov_len=236}, {iov_base=NULL, iov_len=0}, {iov_base="",
iov_len=0}], 3) = 236
recvmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="[\2\371kT\1 \0U\1
\0\217)y\0\0\0\26\0\26\0\2\0\n\5h\3\26\0\30\0", iov_len=4096}], msg_iovlen=1,
msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=6, events=POLLIN}], 3,
0) = 0 (Timeout)
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
The trayapp is doing nothing. Can anybody explain how to stop this behaviour in
gnome-panel? Thanks!
** Affects: gnome-panel (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "python-tray.tar.gz"
https://bugs.launchpad.net/bugs/1779663/+attachment/5158665/+files/python-tray.tar.gz
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https://bugs.launchpad.net/bugs/1779663
Title:
QT4 Tray application and CPU load in 18.04
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