*** This bug is a duplicate of bug 1674838 ***
https://bugs.launchpad.net/bugs/1674838
Since upgrading to Ubuntu 17-04, I have been experiencing the same
problem with Firefox (and other network applications, even ping). No
reaction to kill, so probably hanging in a syscall. I also have these
"CPU… stuck for 22s" messages in syslog, every 28 – 30 seconds. And the
process taking 100% of a CPU is usually firefox, not khugepaged, so
maybe the problem is not a duplicate of bug #1674838.
While in such cases my system cannot be shutdown regularly it still
accepts magic SysRq (REISUB).
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https://bugs.launchpad.net/bugs/1689538
Title:
Firefox hangs then 17.04 won't shutdown and misbehaves
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