Public bug reported:
Immediately after upgrading from 18.10 to 19.04, my computer froze about
30-40 secs after I logged in.
I finally tracked this down to the tracker-extract process. This process
starts within about half a minute after logging in. When it starts, it's
a matter of seconds until it consumes 100% CPU and all available system
memory (I have 16 GB on an Intel 8700k @ 4.8 GHz and SSD/M.2)
This only happens with my regular user. It does not occur with a newly
created user (I guess due to the large amount of files within my home
directory).
It happens every time I log in.
I'm filing this bug against the Ubuntu package because this phenomenon
causes the entire system to freeze up completely. The wheels seem to
fall off the wagon in such a way the system can't recover. The only
alternative at this point is a hard reset or SysRQ REISUB. It is not
possible to switch to a TTY (ctrl-alt-fX), and it's not possible to ssh
in from another machine. SysRQ-k does not work. I've tried logging in to
a TTY before logging in to the GUI, and then switching to the TTY
quickly after logging in to the GUI. Surely enough - a few seconds later
the TTY locks up as well.
I can reproduce the problem easily, but I'm not sure how to go about
debugging it - would be happy to assist. I can't let the process run for
more than a few seconds at a time so bear that in mind. I tried grabbing
the process in gdb, but the package seem to be stripped of debug
symbols. I did a strace -p for a few seconds and the process _appears_
to be symlinking files in my homedirectory to a subdirectory within /tmp
(?!?) - I can get more details here if it helps.
A bonus question from me is how it's possible that a process run by a
user can take down the entire system in this manner.
tracker-extract and tracker-miner-fs: 2.1.6-1
tracker: 2.1.8-2
kernel: 5.0.0-13-generic (I've also tried 5.0.9)
I've attached a photo(!) of top illustrating what's going on (at this
point the machine has already frozen up. There appears to still be some
memory available, but this is just because top never got around to
report the true numbers before the machine died.)
** Affects: tracker-miners (Ubuntu)
Importance: Undecided
Status: New
** Tags: freeze lock-up tracker-extract
** Attachment added: "2019-04-25 18.26.23.jpg"
https://bugs.launchpad.net/bugs/1826439/+attachment/5259089/+files/2019-04-25%2018.26.23.jpg
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https://bugs.launchpad.net/bugs/1826439
Title:
tracker-extract causes system lock-up due to 100% CPU and memory usage
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