Public bug reported:
Upgraded from xenial to zesty recently.
I was using a Firefox instance, one which is a part of Tor Browser
Bundled. First, the application window grayed out, then the whole system
froze for something like 30 seconds (I tried to switch to VT1 to no
avail), then the process got killed.
Well, not exactly killed.
The grayed-out window is still there, `xprop | grep PID` and clicking on
it gives:
```
_NET_WM_PID(CARDINAL) = 13
```
PID 13 is a child of kthreadd:
```
$ ps -A | awk '$1 == "13" { print }'
13 ? 00:00:00 cpuhp/1
```
And this is how the relevant part of `ps -AH` with the "killed" process
looks like:
```
5709 pts/11 00:00:00 firejail
5710 pts/11 00:00:00 firejail
5725 pts/11 00:00:00 bash
5736 pts/11 00:56:49 firefox <defunct>
5769 pts/11 00:00:24 tor
```
I checked syslog and dmesg. Both of them have an interesting and
identical message, which I add as dmesg.log.
I also add the output of `cat /proc/version_signature` as version.log.
I don't think `sudo lspci -vnvn` is relevant here, so I'm not gonna
share it unless absolutely necessary.
The crashed process will be there for something like 2 or 3 days at
least (I don't restart my laptop often), so feel free to ask me to
manipulate or query it somehow, if necessary.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1683091
Title:
The whole system froze for something like 30 seconds, then a process
got killed
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