Public bug reported:

Upgraded from 19.04 to current 19.10 using "do-release-upgrade -d". Can
still boot using the previous 5.0.0-25-generic kernel, but the
5.2.0-15-generic fails to start.

On selecting Ubuntu from Grub, the message "error: out of memory." is
immediately shown. Pressing a key attempts to start boot-up but fails to
mount root fs.

Machine is HP Spectre X360 with 8GB RAM. Under kernel 5.0.0, free shows
the following (run from Gnome terminal):

              total        used        free      shared  buff/cache   available
Mem:        7906564     1761196     3833240     1020216     2312128     4849224
Swap:       1003516           0     1003516

Kernel packages installed:

linux-generic                              5.2.0.15.16 amd64
linux-headers-5.2.0-15                     5.2.0-15.16 all
linux-headers-5.2.0-15-generic             5.2.0-15.16 amd64
linux-headers-generic                      5.2.0.15.16 amd64
linux-image-5.0.0-25-generic               5.0.0-25.26 amd64
linux-image-5.2.0-15-generic               5.2.0-15.16+signed1 amd64
linux-image-generic                        5.2.0.15.16 amd64
linux-modules-5.0.0-25-generic             5.0.0-25.26 amd64
linux-modules-5.2.0-15-generic             5.2.0-15.16 amd64
linux-modules-extra-5.0.0-25-generic       5.0.0-25.26 amd64
linux-modules-extra-5.2.0-15-generic       5.2.0-15.16 amd64

Photo of kernel panic attached.

NVMe drive partition layout (GPT):

Device           Start        End   Sectors   Size Type
/dev/nvme0n1p1    2048    1050623   1048576   512M EFI System
/dev/nvme0n1p2 1050624    2549759   1499136   732M Linux filesystem
/dev/nvme0n1p3 2549760 1000214527 997664768 475.7G Linux filesystem

$ sudo pvs
  PV                          VG        Fmt  Attr PSize    PFree
  /dev/mapper/nvme0n1p3_crypt ubuntu-vg lvm2 a--  <475.71g    0

$ sudo lvs
  LV     VG        Attr       LSize   Pool Origin Data%  Meta%  Move Log 
Cpy%Sync Convert
  root   ubuntu-vg -wi-ao---- 474.75g
  swap_1 ubuntu-vg -wi-ao---- 980.00m

Partition 3 is LUKS encrypted. Root LV is ext4.

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Attachment added: "IMG_20190902_131055.jpg"
   
https://bugs.launchpad.net/bugs/1842320/+attachment/5286212/+files/IMG_20190902_131055.jpg

** Description changed:

  Upgraded from 19.04 to current 19.10 using "do-release-upgrade -d". Can
  still boot using the previous 5.0.0-25-generic kernel, but the
  5.2.0-15-generic fails to start.
  
  On selecting Ubuntu from Grub, the message "error: out of memory." is
  immediately shown. Pressing a key attempts to start boot-up but fails to
  mount root fs.
  
  Machine is HP Spectre X360 with 8GB RAM. Under kernel 5.0.0, free shows
  the following (run from Gnome terminal):
  
-               total        used        free      shared  buff/cache   
available
+               total        used        free      shared  buff/cache   
available
  Mem:        7906564     1761196     3833240     1020216     2312128     
4849224
  Swap:       1003516           0     1003516
  
  Kernel packages installed:
  
- ii  linux-generic                              5.2.0.15.16                    
      amd64        Complete Generic Linux kernel and headers
- ii  linux-headers-5.2.0-15                     5.2.0-15.16                    
      all          Header files related to Linux kernel version 5.2.0
- ii  linux-headers-5.2.0-15-generic             5.2.0-15.16                    
      amd64        Linux kernel headers for version 5.2.0 on 64 bit x86 SMP
- ii  linux-headers-generic                      5.2.0.15.16                    
      amd64        Generic Linux kernel headers
- ii  linux-image-5.0.0-25-generic               5.0.0-25.26                    
      amd64        Signed kernel image generic
- ii  linux-image-5.2.0-15-generic               5.2.0-15.16+signed1            
      amd64        Signed kernel image generic
- ii  linux-image-generic                        5.2.0.15.16                    
      amd64        Generic Linux kernel image
- ii  linux-modules-5.0.0-25-generic             5.0.0-25.26                    
      amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 
SMP
- ii  linux-modules-5.2.0-15-generic             5.2.0-15.16                    
      amd64        Linux kernel extra modules for version 5.2.0 on 64 bit x86 
SMP
- ii  linux-modules-extra-5.0.0-25-generic       5.0.0-25.26                    
      amd64        Linux kernel extra modules for version 5.0.0 on 64 bit x86 
SMP
- ii  linux-modules-extra-5.2.0-15-generic       5.2.0-15.16                    
      amd64        Linux kernel extra modules for version 5.2.0 on 64 bit x86 
SMP
+ linux-generic                              5.2.0.15.16 amd64
+ linux-headers-5.2.0-15                     5.2.0-15.16 all
+ linux-headers-5.2.0-15-generic             5.2.0-15.16 amd64
+ linux-headers-generic                      5.2.0.15.16 amd64
+ linux-image-5.0.0-25-generic               5.0.0-25.26 amd64
+ linux-image-5.2.0-15-generic               5.2.0-15.16+signed1 amd64
+ linux-image-generic                        5.2.0.15.16 amd64
+ linux-modules-5.0.0-25-generic             5.0.0-25.26 amd64
+ linux-modules-5.2.0-15-generic             5.2.0-15.16 amd64
+ linux-modules-extra-5.0.0-25-generic       5.0.0-25.26 amd64
+ linux-modules-extra-5.2.0-15-generic       5.2.0-15.16 amd64
  
  Photo of kernel panic attached.
  
  NVMe drive partition layout (GPT):
  
  Device           Start        End   Sectors   Size Type
  /dev/nvme0n1p1    2048    1050623   1048576   512M EFI System
  /dev/nvme0n1p2 1050624    2549759   1499136   732M Linux filesystem
  /dev/nvme0n1p3 2549760 1000214527 997664768 475.7G Linux filesystem
  
  $ sudo pvs
-   PV                          VG        Fmt  Attr PSize    PFree
-   /dev/mapper/nvme0n1p3_crypt ubuntu-vg lvm2 a--  <475.71g    0 
+   PV                          VG        Fmt  Attr PSize    PFree
+   /dev/mapper/nvme0n1p3_crypt ubuntu-vg lvm2 a--  <475.71g    0
  
  $ sudo lvs
-   LV     VG        Attr       LSize   Pool Origin Data%  Meta%  Move Log 
Cpy%Sync Convert
-   root   ubuntu-vg -wi-ao---- 474.75g                                         
           
-   swap_1 ubuntu-vg -wi-ao---- 980.00m  
+   LV     VG        Attr       LSize   Pool Origin Data%  Meta%  Move Log 
Cpy%Sync Convert
+   root   ubuntu-vg -wi-ao---- 474.75g
+   swap_1 ubuntu-vg -wi-ao---- 980.00m
  
  Partition 3 is LUKS encrypted. Root LV is ext4.

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https://bugs.launchpad.net/bugs/1842320

Title:
  Out of Memory on boot with 5.2.0 kernel

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