Update: if I switch AppArmor to complain mode, the refresh problems
disappear. Here is a syslog excerpt with the AppArmor audit lines
(notice the third one about /dev/nvidia-modeset):
Jan 28 18:06:48 fsol kernel: [24416.113173] audit: type=1400
audit(1485623208.731:2574): apparmor="ALLOWED" operation="open"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}" name="/etc/ld.so.preload"
pid=6919 comm="plugin-containe" requested_mask="r" denied_mask="r" fsuid=1000
ouid=0
Jan 28 18:06:48 fsol kernel: [24416.229774] audit: type=1400
audit(1485623208.847:2575): apparmor="ALLOWED" operation="open"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/sys/devices/system/node/node0/meminfo" pid=6779 comm="firefox"
requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
Jan 28 18:06:48 fsol kernel: [24416.289012] audit: type=1400
audit(1485623208.907:2576): apparmor="ALLOWED" operation="open"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}" name="/dev/nvidia-modeset"
pid=6779 comm="firefox" requested_mask="wr" denied_mask="wr" fsuid=1000 ouid=0
Jan 28 18:06:48 fsol kernel: [24416.293270] audit: type=1400
audit(1485623208.911:2577): apparmor="ALLOWED" operation="sendmsg"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}" pid=6779 comm="firefox"
family="unix" sock_type="dgram" protocol=0 requested_mask="send"
denied_mask="send" addr=none
peer_addr="@6E7669646961666463393761343100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
peer="unconfined"
Jan 28 18:06:48 fsol kernel: [24416.293291] audit: type=1400
audit(1485623208.911:2578): apparmor="ALLOWED" operation="sendmsg"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}" pid=6779 comm="firefox"
family="unix" sock_type="dgram" protocol=0 requested_mask="send"
denied_mask="send" addr=none
peer_addr="@6E7669646961666463393761343100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
peer="unconfined"
Jan 28 18:06:48 fsol kernel: [24416.293373] audit: type=1400
audit(1485623208.911:2579): apparmor="ALLOWED" operation="sendmsg"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}" pid=6779 comm="firefox"
family="unix" sock_type="dgram" protocol=0 requested_mask="send"
denied_mask="send" addr=none
peer_addr="@6E7669646961666463393761343100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
peer="unconfined"
Jan 28 18:06:48 fsol kernel: [24416.300618] audit: type=1400
audit(1485623208.919:2580): apparmor="ALLOWED" operation="sendmsg"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}" pid=6779 comm="firefox"
family="unix" sock_type="dgram" protocol=0 requested_mask="send"
denied_mask="send" addr=none
peer_addr="@6E7669646961666463393761343100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
peer="unconfined"
Jan 28 18:06:49 fsol dbus[4270]: apparmor="ALLOWED"
operation="dbus_method_call" bus="session" path="/org/gtk/vfs/mounttracker"
interface="org.gtk.vfs.MountTracker" member="ListMountableInfo" mask="send"
name=":1.25" pid=6919 label="/usr/lib/firefox/firefox{,*[^s][^h]}"
peer_pid=4448 peer_label="unconfined"
Jan 28 18:06:56 fsol kernel: [24423.824158] audit: type=1400
audit(1485623216.443:2581): apparmor="ALLOWED" operation="mknod"
profile="/usr/lib/firefox/firefox{,*[^s][^h]}"
name="/dev/shm/org.chromium.T6Ehgv" pid=6919 comm=57656220436F6E74656E74
requested_mask="c" denied_mask="c" fsuid=1000 ouid=1000
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https://bugs.launchpad.net/bugs/1660051
Title:
refresh problems with multi-process
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