[Bug 1934221] Re: systemd-resolve segfault

Launchpad Bug Tracker 1934221 at bugs.launchpad.net
Wed Sep 15 03:24:04 UTC 2021 

This bug was fixed in the package systemd - 245.4-4ubuntu3.13

---------------
systemd (245.4-4ubuntu3.13) focal; urgency=medium

  * d/p/dell-clamshell-accel-location-base-with-sku.patch:
    Revert incorrect patch (LP: #1942899)

systemd (245.4-4ubuntu3.12) focal; urgency=medium

  [ Yao Wei ]
  * d/p/dell-clamshell-accel-location-base.patch:
    Add ACCEL_LOCATION=base property for Dell clamshell models (LP: #1938259)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=5c1be33900edee94da0dc9a4ade8edcd079b4c85

  [ Lukas Märdian ]
  * Add d/p/lp1934221-resolved-disable-event-sources-before-unreffing-them.patch
    - Fix segfault in systemd-resolve (LP: #1934221)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=6c401900c70962052f56c7108fdc02fe7f84c9bf

  [ Simon Chopin ]
  * d/p/lp1914740-network-enable-DHCP-broadcast-flag-if-required-by-in.patch:
    - Apply upstream patch to fix Hipersocket DHCP mode (LP: #1914740)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=326ae43b7966d9e7c5f7124027185a79a07fa276

  [ Dan Streetman ]
  * d/p/lp1934981-correct-suspend-then-sleep-string.patch:
    Fix sleep verb used by logind during suspend-then-hibernate
    (LP: #1934981)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=997f3a7da3d5db22e3c63626c3f7dc3dff0830b0
  * d/p/lp1937238-util-return-the-correct-correct-wd-from-inotify-help.patch:
    Fix watch for time sync (LP: #1937238)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=dbabff8a03eb232c19174eff1335cd7cb7d7860c
  * d/extra/dhclient-enter-resolved-hook:
    Reset start limit counter for systemd-resolved in dhclient hook
    (LP: #1939255)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=9d3a91a0b70a4b2bcc166f366cd0a880fd494812
  * d/p/lp1935051-shared-unit-file-make-sure-the-old-hashmaps-and-sets.patch:
    Fix memory leak in path cache (LP: #1935051)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=12d6bdeb35f309158fe8d4242c6dd9be4d067604
  * d/p/lp1934147/0001-cgroup-do-catchup-for-unit-cgroup-inotify-watch-file.patch,
    d/p/lp1934147/0002-core-Make-sure-cgroup_oom_queue-is-flushed-on-manage.patch:
    Catchup cgroup inotify watch after reexec/reload (LP: #1934147)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=63eabc88b8e0005eb40b15b543538ce35377bdbd

 -- Dan Streetman <ddstreet at canonical.com>  Tue, 07 Sep 2021 14:37:22
-0400

** Changed in: systemd (Ubuntu Focal)
       Status: Fix Committed => Fix Released

** Changed in: systemd (Ubuntu Hirsute)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1934221

Title:
  systemd-resolve segfault

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Fix Released
Status in systemd source package in Hirsute:
  Fix Released
Status in systemd source package in Impish:
  Fix Released

Bug description:
  [Impact]

   * systemd-resolved stops replying to clients on the local LAN.
   * logging segfault crashes in dmesg:
  [836786.046514] systemd-resolve[872009]: segfault at 39900000000 ip 0000039900000000 sp 00007ffd7959a6d8 error 14 in systemd-resolved[556398695000+9000]
  [836786.046524] Code: Bad RIP value.
  [840887.303994] traps: systemd-resolve[877019] general protection fault ip:55ba402e2594 sp:7ffe8cb6bbb0 error:0 in systemd-resolved[55ba402b5000+40000]
  [844395.313421] systemd-resolve[878503]: segfault at 208 ip 00005557a249f5fa sp 00007ffe686f5a90 error 6 in systemd-resolved[5557a2472000+40000]
  [844395.313431] Code: 48 85 c0 74 0e 48 8b 8d 00 01 00 00 48 89 88 00 01 00 00 48 8b 85 00 01 00 00 48 85 c0 0f 84 1d 01 00 00 48 8b 95 f8 00 00 00 <48> 89 90 f8 00 00 00 48 c7 85 00 01 00 00 00 00 00 00 48 c7 85 f8

   * The upload backports the upstream fix
  (https://github.com/systemd/systemd/pull/18832) to Focal & Hirsute.

  [Test Plan]

   * Setup /etc/systemd/resolved.conf:
  [Resolve]
  DNS=46.182.19.48#dns2.digitalcourage.de 1.1.1.1#cloudflare-dns.com 9.9.9.9#dns.quad9.net
  DNSSEC=yes
  DNSOverTLS=opportunistic
  MulticastDNS=no
  LLMNR=no
  Cache=yes
  DNSStubListener=yes
  Domains=~.

   * wait for ~24-48 hours and observe if any crash happens

  [Where problems could occur]

   * Any regression would likely cause crashes in systemd-resolved,
  making it unresponsive to DNS network name requests to local
  applications.

  [Other Info]
   
   * Reported upstream: https://github.com/systemd/systemd/issues/18427
   * Fixed upstream in v248: https://github.com/systemd/systemd/pull/18832

  === Original description ===

  
  systemd-resolve keep crashing and it is very annoying as sometimes it severely interrupt normal dns resolving.

  Last uploaded report is 2d9e7378-d89b-11eb-9e14-fa163ee63de6
  Typical error in dmesg:
  systemd-resolve[1792202]: segfault at 564ff982f3e0 ip 0000564ff982f3e0 sp 00007ffe2fd0b758 error 15

  apport hints me that problem is related to mdns

  #3  0x00007f3e903c2f11 in sd_event_dispatch () from
  /lib/systemd/libsystemd-shared-245.so

  It might be (or not) related that some hosts with mdns in my network
  have ipv6 enabled.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: systemd 245.4-4ubuntu3.7
  ProcVersionSignature: Ubuntu 5.4.0-75.84-generic 5.4.119
  Uname: Linux 5.4.0-75-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jul  1 08:22:51 2021
  InstallationDate: Installed on 2018-12-05 (938 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.3)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-75-generic root=UUID=54b80d5c-3d61-4919-873f-0d308083e3b9 ro quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: Upgraded to focal on 2020-05-22 (405 days ago)
  dmi.bios.date: 05/12/2020
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1205
  dmi.board.asset.tag: Default string
  dmi.board.name: ROG STRIX X399-E GAMING
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1205:bd05/12/2020:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXX399-EGAMING:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: System Product Name
  dmi.product.sku: SKU
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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