Hi Brian,
do you know some way to get a good backtrace for your purpose? Note that
this is 100% reproducible, just run update manager, and even if it tells
you that the system is up to date, switch window focus to somewhere else
to trigger the 8-10% CPU usage.
A quick gdb -p PID and bt doesn't convey much information, the app is
stuck in GTK's event loop:
(gdb) bt
#0 0x00007f31edfd170d in poll () at ../sysdeps/unix/syscall-template.S:84
#1 0x00007f31ec62338c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007f31ec623712 in g_main_loop_run () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3 0x00007f31e3f33395 in gtk_main () from
/usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#4 0x00007f31ec3d6e40 in ffi_call_unix64 () from
/usr/lib/x86_64-linux-gnu/libffi.so.6
#5 0x00007f31ec3d68ab in ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6
#6 0x00007f31ecdc58fc in ?? () from
/usr/lib/python3/dist-packages/gi/_gi.cpython-35m-x86_64-linux-gnu.so
#7 0x00007f31ecdc73e8 in ?? () from
/usr/lib/python3/dist-packages/gi/_gi.cpython-35m-x86_64-linux-gnu.so
#8 0x00000000005b7167 in PyObject_Call ()
#9 0x0000000000528d06 in PyEval_EvalFrameEx ()
#10 0x000000000052d2e3 in ?? ()
#11 0x000000000052dfdf in PyEval_EvalCode ()
#12 0x00000000005fd2c2 in ?? ()
#13 0x00000000005ff76a in PyRun_FileExFlags ()
#14 0x00000000005ff95c in PyRun_SimpleFileExFlags ()
#15 0x000000000063e7d6 in Py_Main ()
#16 0x00000000004cfe41 in main ()
Also when this happens strace shows just an endless and constant stream of
poll() wakeups over the X11 socket descriptor:
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=9, events=POLLIN},
{fd=11, events=POLLIN}, {fd=12, events=POLLIN}], 5, 498) = 1 ([{fd=3,
revents=POLLIN}])
recvmsg(3, {msg_name(0)=NULL,
msg_iov(1)=[{"A\0Db\374\23`\4\3\0\202\0\f\0`\4\0P8\0\0\0\0\0\0\0\0\0\0\0\0\0",
4096}], msg_controllen=0, msg_flags=0}, 0) = 32
recvmsg(3, 0x7fffa8436e80, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, 0x7fffa8436d30, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, 0x7fffa8436e60, 0) = -1 EAGAIN (Resource temporarily
unavailable)
poll([{fd=3, events=POLLIN}, {fd=4, events=POLLIN}, {fd=9, events=POLLIN},
{fd=11, events=POLLIN}, {fd=12, events=POLLIN}], 5, 498) = 1 ([{fd=3,
revents=POLLIN}])
recvmsg(3, {msg_name(0)=NULL,
msg_iov(1)=[{"#\203|b\32\0\0\0\6\0\2\0\340\330\333\10\0\0\0\0\366\0\0\0\7\0`\4\0\0\0\0"...,
4096}], msg_controllen=0, msg_flags=0}, 0) = 136
recvmsg(3, 0x7fffa8436e80, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, 0x7fffa8436d30, 0) = -1 EAGAIN (Resource temporarily
unavailable)
recvmsg(3, 0x7fffa8436e60, 0) = -1 EAGAIN (Resource temporarily
unavailable)
This stops as soon as the window gets focused.
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https://bugs.launchpad.net/bugs/1637180
Title:
"The computer needs to restart" dialog constantly eats CPU
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