.This is a new laptop with fresh install. I received it only a few days
before noticing the swapping issue. Laptop model is previous generation
meaning that this hardware has been around for nearly two years.
I haven't tried older kernels if I can find a stable one. Only relevant
looking report about very similar problem pointed to bug being present
already in 3.19 kernels. If this is same bug then his report about older
kernel being stable means I would need to install quite old kernel to
find a stable one. But I might setup kernel build and bisection for the
broken commit in a few days. But I wanted first to learn how relevant
code behaviors in my system before trying to find the bug. That means I
need to read thousands lines of code and setup some kernel traces to see
how thread, hw access and irq timings interact.
I tested mainline kernel package linux-
image-4.7.0-040700rc2-generic_4.7.0-040700rc2.201606051831_amd64.deb
There is some changes to system behavior but still underlying bug is
present that makes swapping not working on this laptop.
Changes in 4.7-rc2 kernel:
+ SLUB now reports actively about allocation problems
+ Kernel manages to use about 1G swap space before freezing (so far only one
attempt to reproduce) when 4.4 kernel consistently used only about 100M swap
before freeze
+ freeze triggers OOM killer very quickly and system automatically recovers
after OOM killer removes the offending compiling process.
- Netconsole has become unreliable. There is allocation failures reported from
netconsole context that results to lost kernel messages
+ Local kernel log recorded to disk is complete. There is no report from
systemd about ring buffer overflows.
Attaching locally recorded kern.log from boot and reproduction attempt.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: kernel-bug-exists-upstream
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https://bugs.launchpad.net/bugs/1589563
Title:
ext4 journaling and swapping to same encrypted SSHD hangs system
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