[Bug 1886115] Re: libseccomp 2.4.3-1ubuntu3.18.04.2 causes systemd to segfault on boot

Thu Jul 30 13:05:02 UTC 2020

Hello guenthert, or anyone else affected,

Accepted systemd into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.42 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
bionic to verification-done-bionic. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-bionic. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: systemd (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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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:
  Incomplete
Status in systemd package in Ubuntu:
  Fix Released
Status in libseccomp source package in Bionic:
  New
Status in systemd source package in Bionic:
  Fix Committed

Bug description:
  [impact]

  systemd sometimes crashes on boot due to free of uninitalized var

  [test case]

  a specific system setup is required, see original description

  [regression potential]

  any regression would likely involve further crashes on boot.

  [scope]

  this is needed in b.

  this is fixed upstream by commit
  58d9d89b4b41189bdcea86c2ad5cf708b7d54aca which is included starting in
  v240, so this is included already in f and later.

  this is caused by commit 25cd49647c8 which is included starting in
  v237, so this bug does not exist in x.

  [original 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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