unity-panel-service uses 3% to 5% of one CPU core all the time

[Paul]

unity-panel-service sits at between 3% and 5% of one core, all the time. That's up to 50 MIPS! What's it doing?

Only standard indicators used, and most Unity lenses and scopes not installed. Internet access is available and unfiltered. Standard Intel Mobile 4 GPU.

When I set the datetime indicator to show seconds, unity-panel-service uses an additional 1% of CPU. That's 10 million instructions each time the clock ticks!

Sample strace output (most of it looks like this, repeated over and over again, once per second):

futex(0x7fad2800f2b0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad2800eac0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad28004110, FUTEX_WAKE_PRIVATE, 1) = 1
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 481) = 1 ([{fd=4, revents=POLLIN}])
write(7, "\1\0\0\0\0\0\0\0", 8) = 8
futex(0x7fad2800f2b0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad2800eac0, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7fad28004110, FUTEX_WAKE_PRIVATE, 1) = 1
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 478) = 1 ([{fd=4, revents=POLLIN}])
read(4, "\1\0\0\0\0\0\0\0", 16) = 8
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 478) = 0 (Timeout)
read(4, 0x7fff81ade700, 16) = -1 EAGAIN (Resource temporarily unavailable)
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 962) = 1 ([{fd=4, revents=POLLIN}])
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 80) = 1 ([{fd=4, revents=POLLIN}])
read(4, "\1\0\0\0\0\0\0\0", 16) = 8
recvfrom(3, 0x25896f4, 4096, 0, 0, 0) = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=4, events=POLLIN}, {fd=3, events=POLLIN}, {fd=10, events=POLLIN}], 3, 80) = 0 (Timeout)
read(4, 0x7fff81ade700, 16) = -1 EAGAIN (Resource temporarily unavailable)
write(7, "\1\0\0\0\0\0\0\0", 8) = 8

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Andrea Azzarone (azzar1)]

Thank you for taking the time to report this bug. We have tried to recreate this on the latest release of Ubuntu and cannot reproduce it. This bug is being marked as Invalid. If you believe the problem to still exist in the latest version of Ubuntu please comment on why that is the case and change the bug status to NEW.”