Hi there.
I have encountered the same issue as Dennis Sheil in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1674838/comments/18
post.
The same way, was using firefox which in turn became unresponsive.
The difference is that I am running firefox v53.0 in docker
(v17.04.0-ce) using ``--kernel-memory=2G`` to limit it. Then I've
increased that limit once it has been reached up to 4G. (``docker update
--kernel-memory=4G firefox``). Shortly after that firefox became
unresponsive.
Please find attached dmesg logs in dmesg-firefox-kernel-swap-bug.txt
Linux kernel ver. 4.10.0-19-generic
And below are some outputs while I've hit that problem, hopefully some
useful info in there:
```
$ df (hanged)
root@sony:~# ps auxww |grep Z
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
arno 8866 5.0 0.0 0 0 ? Zl 00:18 70:14 [firefox]
<defunct>
arno 8908 10.2 0.0 0 0 ? Z 00:18 142:19 [Web Content]
<defunct>
arno@sony:~$ mount |grep -i docker
rpool/docker on /var/lib/docker type zfs (rw,nodev,noatime,xattr,noacl)
rpool/docker on /var/lib/docker/zfs type zfs (rw,nodev,noatime,xattr,noacl)
rpool/docker/96f7e9089ac7e330e9868d3ff4530b39364e574a3a32479d7c3ca41f2ad76476
on
/var/lib/docker/zfs/graph/96f7e9089ac7e330e9868d3ff4530b39364e574a3a32479d7c3ca41f2ad76476
type zfs (rw,relatime,xattr,noacl)
shm on
/var/lib/docker/containers/7e253eea4f68195d1085aeb69d7f0428f0106cb414c66a27e03dab27a814b37f/shm
type tmpfs (rw,nosuid,nodev,noexec,relatime,size=2097152k)
nsfs on /run/docker/netns/c1194198f0d2 type nsfs (rw)
```
Very strange part is that my SWAP file got reduced itself down to 16MiB:
```
root@sony:~# swapoff -a
hanged ...
though reduced swap usage down to 16M (and Swap Total !!)
arno@sony:~$ free -mh
total used free shared buff/cache available
Mem: 7.7G 1.9G 3.5G 710M 2.3G 3.6G
Swap: 16M 16M 0B
arno@sony:~$ free -b
total used free shared buff/cache available
Mem: 8270503936 2048671744 3625005056 745644032 2596827136 3855400960
Swap: 17055744 17055744 0
```
Whilst, I should normally have 8GiB swap:
```
root@sony:~# free -mh
total used free shared buff/cache available
Mem: 7.7G 2.0G 4.1G 473M 1.6G 4.4G
Swap: 8.0G 0B 8.0G
root@sony:~# free -b
total used free shared buff/cache available
Mem: 8270512128 2095005696 4448485376 496779264 1727021056 4701388800
Swap: 8589930496 0 8589930496
root@sony:~#
```
** Attachment added: "dmesg-firefox-kernel-swap-bug.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1674838/+attachment/4867386/+files/dmesg-firefox-kernel-swap-bug.txt
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https://bugs.launchpad.net/bugs/1674838
Title:
kernel BUG at /build/linux-
7LGLH_/linux-4.10.0/include/linux/swapops.h:129
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