> can you confirm which one you have had to disable the SystemCallFilter?
  Both files are just symlinks to /lib/systemd/system/systemd-resolved.service.

> Also there appear to be a bunch of systemd managed services which have failed 
> to run
  I moved snap related services out of the way recently as it isn't used here.  
systemd complains, but I didn't observe any other ill effects yet.

> could you perhaps downgrade libseccomp back to the previous version and see 
> if this resolves the issue?
--8<--
$ sudo apt install libseccomp=2.4.1-0ubuntu0.18.04.2
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package libseccomp
tho@deimos:~$ sudo apt install libseccomp2=2.4.1-0ubuntu0.18.04.2
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Version '2.4.1-0ubuntu0.18.04.2' for 'libseccomp2' was not found
-->8--

  I attempted to downgrade earlier, but couldn't readily find that
original package.  Let me have another look (I might have still the
original install medium) ...

> try and capture a more complete stack trace of the crash
  Hmmh?  The call stack is fairly shallow here (not untypical for non-recursive 
applications programmed in C), what do you expect is missing?  I saved the 
original core file, but can produce a new one as you described above later.

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You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1886115

Title:
  libseccomp 2.4.3-1ubuntu3.18.04.2 causes systemd to segfault on boot

Status in libseccomp package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
    After applying updates to Ubuntu 18.04 my desktop (apple mini with
  i5-2415M CPU) failed to complete the boot process.  A few seconds into
  the boot, the last message displayed is "/var mounted".  The system
  then appears to hang indefinitely.

    Luckily, the 'rescue' boot image allows the boot process to proceed 
sufficiently far to allow a root shell to be spawned.  Unfortunately no log 
files were written during the unsuccessful attempts to boot.  Spawning a 2nd 
root shell (# nohup getty tty5) on a 2nd virtual terminal (tty5) I was able to 
observe the message 'systemd freezing execution' after I closed the first root 
shell and resumed the boot process.  Further a core file was created (belonging 
to /sbin/init) in the root fs
  --8<--
  (gdb) bt
  #0  0x00007f16807ba187 in kill () at ../sysdeps/unix/syscall-template.S:78
  #1  0x0000563b957223b7 in ?? ()
  #2  <signal handler called>
  #3  __GI___libc_free (mem=0x4a60d140dfd9a5) at malloc.c:3103
  #4  0x0000563b9577c22e in ?? ()
  #5  0x0000563b957672d6 in ?? ()
  #6  0x0000563b9576ba22 in ?? ()
  #7  0x0000563b9574f51a in ?? ()
  #8  0x00007f16803a509a in ?? () from /lib/systemd/libsystemd-shared-237.so
  #9  0x00007f16803a53ea in sd_event_dispatch () from 
/lib/systemd/libsystemd-shared-237.so
  #10 0x00007f16803a5579 in sd_event_run () from 
/lib/systemd/libsystemd-shared-237.so
  #11 0x0000563b9572a49d in ?? ()
  #12 0x0000563b9571560c in ?? ()
  #13 0x00007f168079cb97 in __libc_start_main (main=0x563b957139c0, argc=3, 
argv=0x7ffe78153758, 
      init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, 
      stack_end=0x7ffe78153748) at ../csu/libc-start.c:310
  #14 0x0000563b957164fa in ?? ()
  (gdb) 
  -->8--
   and the kernel message buffer lists 
  --8<--
  traps: systemd[1] general protection fault ip:7f17ebf6e98d sp:7ffd774d6020 
error:0 in libc-2.27.so[7f17ebed7000+1e7000]
  -->8--
  . 

    To me that looked a bit like Bug 669702 of Gentoo
  (https://bugs.gentoo.org/669702) and indeed one of the (few) updates
  applied just prior the reboot was the update of libseccomp.

    I was able to circumvent the problem by disabling (commenting out) the 
syscall filtering requested by systemd (on my system, only 
/etc/systemd/system/dbus-org.freedesktop.resolve1.service needed to be 
modified).
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CurrentDesktop: MATE
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2019-03-30 (460 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 
(20190210)
  MachineType: Apple Inc. Macmini5,1
  NonfreeKernelModules: wl
  Package: systemd 237-3ubuntu10.41 [modified: 
lib/systemd/system/systemd-resolved.service]
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.3.0-62-generic 
root=UUID=891c2e06-2b40-4e79-a57f-6e550be932bb ro recovery nomodeset
  ProcVersionSignature: Ubuntu 5.3.0-62.56~18.04.1-generic 5.3.18
  Tags:  bionic
  Uname: Linux 5.3.0-62-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/24/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MM51.88Z.0077.B10.1201241549
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-8ED6AF5B48C039E1
  dmi.board.vendor: Apple Inc.
  dmi.board.version: Macmini5,1
  dmi.chassis.type: 16
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-8ED6AF5B48C039E1
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMM51.88Z.0077.B10.1201241549:bd01/24/2012:svnAppleInc.:pnMacmini5,1:pvr1.0:rvnAppleInc.:rnMac-8ED6AF5B48C039E1:rvrMacmini5,1:cvnAppleInc.:ct16:cvrMac-8ED6AF5B48C039E1:
  dmi.product.family: Macmini
  dmi.product.name: Macmini5,1
  dmi.product.sku: System SKU#
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CurrentDesktop: MATE
  Dependencies:
   gcc-8-base 8.4.0-1ubuntu1~18.04
   libc6 2.27-3ubuntu1
   libgcc1 1:8.4.0-1ubuntu1~18.04
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2019-03-30 (460 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 
(20190210)
  NonfreeKernelModules: wl
  Package: libseccomp2 2.4.3-1ubuntu3.18.04.2
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 5.3.0-62.56~18.04.1-generic 5.3.18
  Tags:  bionic
  Uname: Linux 5.3.0-62-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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