Public bug reported:

I have cryptoswap set up both with the 2 GB default swap file and an 8
GB swap partition with 8 GB of ram.  However, the system does not use
this swap when it should.  For example, if I run a little test code
which attempts to allocate 10 GB of memory in 1 GB chuncks, the system
hangs with no obvious use of swap.  E.g. running top shows no swap use
before the hang.  However, if I replace cryptoswap by standard swap, it
works as expected: allocates the requested memory and exits, using swap.
Of course, my disk is slow, so this takes some time but it does work.

I originally noticed this problem when compiling a very large
application.  The system would hang on ld.  I've checked hardware using
memtest and stress.  No problems.  This took me days to track down but
I'm 99% certain now that the problem is with cryptoswap.  If I compile
with cryptoswap: hang.  If I compile with standard swap: no problem.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-13-generic 4.15.0-13.14
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
 /dev/snd/controlC1:  weinberg   2425 F.... pulseaudio
 /dev/snd/controlC0:  weinberg   2425 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr  9 11:57:23 2018
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=8d33a538-4ec4-418d-b277-be1a9a1c1113
InstallationDate: Installed on 2018-03-12 (28 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180114)
MachineType: LENOVO 20ARA0S100
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic 
root=UUID=b6683bc1-7dd5-4afd-8e70-f69253403b71 ro quiet splash vt.handoff=1
 linux-restricted-modules-4.15.0-13-generic N/A
 linux-backports-modules-4.15.0-13-generic  N/A
 linux-firmware                             1.173
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install) 03/19/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GJET74WW (2.24 )
dmi.board.asset.tag: Not Available 20ARA0S100
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi:bvnLENOVO:bvrGJET74WW(2.24):bd03/19/2014:svnLENOVO:pn20ARA0S100:pvrThinkPadT440s:rvnLENOVO:rn20ARA0S100:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable: ThinkPad T440s 20ARA0S100
dmi.product.version: ThinkPad T440s
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic

** Attachment added: "Code used to induce failure with cryptswap enabled"

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  Cryptoswap not working in Bionic

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