Public bug reported:

Issue found on automated testing.
https://people.canonical.com/~kernel/status/adt-matrix/focal-linux-meta-oem-5.14.html

Package version 6.1.26-dfsg-3~ubuntu1.20.04.2

From the test history this virtualbox-guest-dkms package with version
6.1.26-dfsg-3~ubuntu1.20.04.1 is good with 5.14.0-1004


DKMS build failed with:
$ sudo apt install virtualbox-guest-dkms
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  binutils binutils-common binutils-x86-64-linux-gnu build-essential cpp cpp-9 
dctrl-tools dkms dpkg-dev fakeroot g++ g++-9 gcc gcc-9 gcc-9-base
  libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl 
libasan5 libatomic1 libbinutils libc-dev-bin libc6-dev libcc1-0 libcrypt-dev
  libctf-nobfd0 libctf0 libdpkg-perl libfakeroot libfile-fcntllock-perl 
libgcc-9-dev libgomp1 libisl22 libitm1 liblsan0 libmpc3 libquadmath0 
libstdc++-9-dev
  libtsan0 libubsan1 linux-libc-dev make manpages-dev
Suggested packages:
  binutils-doc cpp-doc gcc-9-locales debtags menu debian-keyring g++-multilib 
g++-9-multilib gcc-9-doc gcc-multilib autoconf automake libtool flex bison gdb 
gcc-doc
  gcc-9-multilib glibc-doc bzr libstdc++-9-doc make-doc
The following NEW packages will be installed:
  binutils binutils-common binutils-x86-64-linux-gnu build-essential cpp cpp-9 
dctrl-tools dkms dpkg-dev fakeroot g++ g++-9 gcc gcc-9 gcc-9-base
  libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl 
libasan5 libatomic1 libbinutils libc-dev-bin libc6-dev libcc1-0 libcrypt-dev
  libctf-nobfd0 libctf0 libdpkg-perl libfakeroot libfile-fcntllock-perl 
libgcc-9-dev libgomp1 libisl22 libitm1 liblsan0 libmpc3 libquadmath0 
libstdc++-9-dev
  libtsan0 libubsan1 linux-libc-dev make manpages-dev virtualbox-guest-dkms
0 upgraded, 44 newly installed, 0 to remove and 19 not upgraded.
Need to get 43.8 MB of archives.
After this operation, 197 MB of additional disk space will be used.
Do you want to continue? [Y/n] 
Get:1 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 gcc-9-base 
amd64 9.3.0-17ubuntu1~20.04 [19.1 kB]
Get:2 http://archive.ubuntu.com/ubuntu focal/main amd64 libisl22 amd64 0.22.1-1 
[592 kB]
Get:3 http://archive.ubuntu.com/ubuntu focal/main amd64 libmpc3 amd64 1.1.0-1 
[40.8 kB]
Get:4 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 cpp-9 amd64 
9.3.0-17ubuntu1~20.04 [7494 kB]
Get:5 http://archive.ubuntu.com/ubuntu focal/main amd64 cpp amd64 
4:9.3.0-1ubuntu2 [27.6 kB]
Get:6 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libcc1-0 amd64 
10.3.0-1ubuntu1~20.04 [48.8 kB]
Get:7 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 binutils-common 
amd64 2.34-6ubuntu1.1 [207 kB]
Get:8 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libbinutils 
amd64 2.34-6ubuntu1.1 [475 kB]
Get:9 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libctf-nobfd0 
amd64 2.34-6ubuntu1.1 [47.1 kB]
Get:10 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libctf0 amd64 
2.34-6ubuntu1.1 [46.6 kB]
Get:11 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 
binutils-x86-64-linux-gnu amd64 2.34-6ubuntu1.1 [1613 kB]
Get:12 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 binutils amd64 
2.34-6ubuntu1.1 [3380 B]
Get:13 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libgomp1 amd64 
10.3.0-1ubuntu1~20.04 [102 kB]
Get:14 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libitm1 amd64 
10.3.0-1ubuntu1~20.04 [26.2 kB]
Get:15 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libatomic1 
amd64 10.3.0-1ubuntu1~20.04 [9284 B]
Get:16 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libasan5 amd64 
9.3.0-17ubuntu1~20.04 [394 kB]
Get:17 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 liblsan0 amd64 
10.3.0-1ubuntu1~20.04 [835 kB]
Get:18 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libtsan0 amd64 
10.3.0-1ubuntu1~20.04 [2009 kB]
Get:19 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libubsan1 
amd64 10.3.0-1ubuntu1~20.04 [784 kB]
Get:20 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libquadmath0 
amd64 10.3.0-1ubuntu1~20.04 [146 kB]
Get:21 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libgcc-9-dev 
amd64 9.3.0-17ubuntu1~20.04 [2360 kB]
Get:22 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 gcc-9 amd64 
9.3.0-17ubuntu1~20.04 [8241 kB]
Get:23 http://archive.ubuntu.com/ubuntu focal/main amd64 gcc amd64 
4:9.3.0-1ubuntu2 [5208 B]
Get:24 http://archive.ubuntu.com/ubuntu focal/main amd64 libdpkg-perl all 
1.19.7ubuntu3 [230 kB]
Get:25 http://archive.ubuntu.com/ubuntu focal/main amd64 make amd64 4.2.1-1.2 
[162 kB]
Get:26 http://archive.ubuntu.com/ubuntu focal/main amd64 dpkg-dev all 
1.19.7ubuntu3 [679 kB]
Get:27 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libc-dev-bin 
amd64 2.31-0ubuntu9.2 [71.8 kB]
Get:28 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 
linux-libc-dev amd64 5.4.0-89.100 [1110 kB]
Get:29 http://archive.ubuntu.com/ubuntu focal/main amd64 libcrypt-dev amd64 
1:4.4.10-10ubuntu4 [104 kB]
Get:30 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 libc6-dev 
amd64 2.31-0ubuntu9.2 [2520 kB]                                                 
          
Get:31 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 
libstdc++-9-dev amd64 9.3.0-17ubuntu1~20.04 [1714 kB]                           
                    
Get:32 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 g++-9 amd64 
9.3.0-17ubuntu1~20.04 [8405 kB]                                                 
        
Get:33 http://archive.ubuntu.com/ubuntu focal/main amd64 g++ amd64 
4:9.3.0-1ubuntu2 [1604 B]                                                       
                  
Get:34 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 
build-essential amd64 12.8ubuntu1.1 [4664 B]                                    
                    
Get:35 http://archive.ubuntu.com/ubuntu focal/main amd64 dctrl-tools amd64 
2.24-3 [61.5 kB]                                                                
          
Get:36 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 dkms all 
2.8.1-5ubuntu2 [66.8 kB]                                                        
           
Get:37 http://archive.ubuntu.com/ubuntu focal/main amd64 libfakeroot amd64 
1.24-1 [25.7 kB]                                                                
          
Get:38 http://archive.ubuntu.com/ubuntu focal/main amd64 fakeroot amd64 1.24-1 
[62.6 kB]                                                                       
      
Get:39 http://archive.ubuntu.com/ubuntu focal/main amd64 libalgorithm-diff-perl 
all 1.19.03-2 [46.6 kB]                                                         
     
Get:40 http://archive.ubuntu.com/ubuntu focal/main amd64 
libalgorithm-diff-xs-perl amd64 0.04-6 [11.3 kB]                                
                            
Get:41 http://archive.ubuntu.com/ubuntu focal/main amd64 
libalgorithm-merge-perl all 0.08-3 [12.0 kB]                                    
                            
Get:42 http://archive.ubuntu.com/ubuntu focal/main amd64 libfile-fcntllock-perl 
amd64 0.22-3build4 [33.1 kB]                                                    
     
Get:43 http://archive.ubuntu.com/ubuntu focal/main amd64 manpages-dev all 
5.05-1 [2266 kB]                                                                
           
Get:44 http://archive.ubuntu.com/ubuntu focal-updates/multiverse amd64 
virtualbox-guest-dkms all 6.1.26-dfsg-3~ubuntu1.20.04.2 [671 kB]                
              
Fetched 43.8 MB in 10s (4569 kB/s)                                              
                                                                                
     
Extracting templates from packages: 100%
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.../43-virtualbox-guest-dkms_6.1.26-dfsg-3~ubuntu1.20.04.2_all.deb ...
Unpacking virtualbox-guest-dkms (6.1.26-dfsg-3~ubuntu1.20.04.2) ...
Setting up manpages-dev (5.05-1) ...
Setting up libfile-fcntllock-perl (0.22-3build4) ...
Setting up libalgorithm-diff-perl (1.19.03-2) ...
Setting up binutils-common:amd64 (2.34-6ubuntu1.1) ...
Setting up linux-libc-dev:amd64 (5.4.0-89.100) ...
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Setting up libgomp1:amd64 (10.3.0-1ubuntu1~20.04) ...
Setting up libfakeroot:amd64 (1.24-1) ...
Setting up fakeroot (1.24-1) ...
update-alternatives: using /usr/bin/fakeroot-sysv to provide /usr/bin/fakeroot 
(fakeroot) in auto mode
Setting up make (4.2.1-1.2) ...
Setting up libquadmath0:amd64 (10.3.0-1ubuntu1~20.04) ...
Setting up libmpc3:amd64 (1.1.0-1) ...
Setting up libatomic1:amd64 (10.3.0-1ubuntu1~20.04) ...
Setting up libdpkg-perl (1.19.7ubuntu3) ...
Setting up libubsan1:amd64 (10.3.0-1ubuntu1~20.04) ...
Setting up libcrypt-dev:amd64 (1:4.4.10-10ubuntu4) ...
Setting up libisl22:amd64 (0.22.1-1) ...
Setting up libbinutils:amd64 (2.34-6ubuntu1.1) ...
Setting up libc-dev-bin (2.31-0ubuntu9.2) ...
Setting up libalgorithm-diff-xs-perl (0.04-6) ...
Setting up libcc1-0:amd64 (10.3.0-1ubuntu1~20.04) ...
Setting up liblsan0:amd64 (10.3.0-1ubuntu1~20.04) ...
Setting up dctrl-tools (2.24-3) ...
Setting up libitm1:amd64 (10.3.0-1ubuntu1~20.04) ...
Setting up gcc-9-base:amd64 (9.3.0-17ubuntu1~20.04) ...
Setting up libalgorithm-merge-perl (0.08-3) ...
Setting up libtsan0:amd64 (10.3.0-1ubuntu1~20.04) ...
Setting up libctf0:amd64 (2.34-6ubuntu1.1) ...
Setting up libasan5:amd64 (9.3.0-17ubuntu1~20.04) ...
Setting up cpp-9 (9.3.0-17ubuntu1~20.04) ...
Setting up libc6-dev:amd64 (2.31-0ubuntu9.2) ...
Setting up binutils-x86-64-linux-gnu (2.34-6ubuntu1.1) ...
Setting up binutils (2.34-6ubuntu1.1) ...
Setting up dpkg-dev (1.19.7ubuntu3) ...
Setting up libgcc-9-dev:amd64 (9.3.0-17ubuntu1~20.04) ...
Setting up cpp (4:9.3.0-1ubuntu2) ...
Setting up gcc-9 (9.3.0-17ubuntu1~20.04) ...
Setting up libstdc++-9-dev:amd64 (9.3.0-17ubuntu1~20.04) ...
Setting up gcc (4:9.3.0-1ubuntu2) ...
Setting up dkms (2.8.1-5ubuntu2) ...
Setting up g++-9 (9.3.0-17ubuntu1~20.04) ...
Setting up g++ (4:9.3.0-1ubuntu2) ...
update-alternatives: using /usr/bin/g++ to provide /usr/bin/c++ (c++) in auto 
mode
Setting up build-essential (12.8ubuntu1.1) ...
Setting up virtualbox-guest-dkms (6.1.26-dfsg-3~ubuntu1.20.04.2) ...
Loading new virtualbox-guest-6.1.26 DKMS files...
Building for 5.14.0-1005-oem
Building initial module for 5.14.0-1005-oem
Error! Bad return status for module build on kernel: 5.14.0-1005-oem (x86_64)
Consult /var/lib/dkms/virtualbox-guest/6.1.26/build/make.log for more 
information.
dpkg: error processing package virtualbox-guest-dkms (--configure):
 installed virtualbox-guest-dkms package post-installation script subprocess 
returned error exit status 10
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.2) ...
Errors were encountered while processing:
 virtualbox-guest-dkms
E: Sub-process /usr/bin/dpkg returned an error code (1)

$ cat /var/lib/dkms/virtualbox-guest/6.1.26/build/make.log
DKMS make.log for virtualbox-guest-6.1.26 for kernel 5.14.0-1005-oem (x86_64)
Fri Oct 15 04:19:01 UTC 2021
make: Entering directory '/usr/src/linux-headers-5.14.0-1005-oem'
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxguest/VBoxGuest-linux.o
  CC [M]  /var/lib/dkms/virtualbox-guest/6.1.26/build/vboxguest/VBoxGuest.o
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxguest/common/string/strformatrt.o
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxguest/combined-agnostic.o
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxguest/combined-os-specific.o
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxguest/combined-os-specific.o: 
warning: objtool: rtR0MemKernelCopyLnxWorker()+0x15: redundant CLD
  LD [M]  /var/lib/dkms/virtualbox-guest/6.1.26/build/vboxguest/vboxguest.o
  CC [M]  /var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/vfsmod.o
  CC [M]  /var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/dirops.o
  CC [M]  /var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/lnkops.o
  CC [M]  /var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/regops.o
  CC [M]  /var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/utils.o
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/VBoxGuestR0LibGenericRequest.o
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/VBoxGuestR0LibHGCM.o
  CC [M]  /var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/VBoxGuestR0LibIdc.o
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/VBoxGuestR0LibIdc-unix.o
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/VBoxGuestR0LibInit.o
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/VBoxGuestR0LibPhysHeap.o
  CC [M]  
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/VBoxGuestR0LibSharedFolders.o
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/regops.c: In function 
‘vbsf_iter_lock_pages’:
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/regops.c:2129:15: error: 
‘struct iov_iter’ has no member named ‘type’
 2129 |     if (!(iter->type & ITER_KVEC)) {
      |               ^~
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/regops.c: In function 
‘vbsf_iter_max_span_of_pages’:
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/regops.c:2376:37: error: 
‘struct iov_iter’ has no member named ‘type’
 2376 |     if (iter_is_iovec(iter) || (iter->type & ITER_KVEC)) {
      |                                     ^~
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/regops.c:2439:28: error: 
‘struct iov_iter’ has no member named ‘type’
 2439 |         size_t cSegs = iter->type & ITER_BVEC ? RT_MAX(1, 
iter->nr_segs) : 1;
      |                            ^~
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/regops.c: At top level:
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/regops.c:3796:23: error: 
‘simple_write_end’ undeclared here (not in a function); did you mean 
‘simple_write_begin’?
 3796 |     .write_end      = simple_write_end,
      |                       ^~~~~~~~~~~~~~~~
      |                       simple_write_begin
make[2]: *** [scripts/Makefile.build:279: 
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf/regops.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [scripts/Makefile.build:522: 
/var/lib/dkms/virtualbox-guest/6.1.26/build/vboxsf] Error 2
make: *** [Makefile:1870: /var/lib/dkms/virtualbox-guest/6.1.26/build] Error 2
make: Leaving directory '/usr/src/linux-headers-5.14.0-1005-oem'

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: virtualbox-guest-dkms 6.1.26-dfsg-3~ubuntu1.20.04.2
ProcVersionSignature: User Name 5.14.0-1005.5-oem 5.14.9
Uname: Linux 5.14.0-1005-oem x86_64
ApportVersion: 2.20.11-0ubuntu27.20
Architecture: amd64
CasperMD5CheckResult: skip
Date: Fri Oct 15 04:22:51 2021
PackageArchitecture: all
SourcePackage: virtualbox
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug focal uec-images

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https://bugs.launchpad.net/bugs/1947310

Title:
  virtualbox-guest-dkms failed to build with Focal OEM 5.14.0-1005

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