[Bug 1882547] Re: systemd-resolved dumps core all the time

[Václav Haisman]

Here is a call stack that I get from gdb:

Reading symbols from /usr/lib/systemd/systemd-resolved...
Reading symbols from /usr/lib/debug/.build-id/bb/f07ab7990febf6bbea9cd22392b488187515fb.debug...
[New LWP 1752251]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/lib/systemd/systemd-resolved'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f62ef3321fa in hashmap_iterate_entry (h=h at entry=0x706f746b73656465, i=i at entry=0x7fffd2814cc0) at ../src/basic/hashmap.c:706
706	../src/basic/hashmap.c: No such file or directory.
(gdb) bt
#0  0x00007f62ef3321fa in hashmap_iterate_entry (h=h at entry=0x706f746b73656465, i=i at entry=0x7fffd2814cc0) at ../src/basic/hashmap.c:706
#1  0x00007f62ef334122 in internal_hashmap_iterate (h=0x706f746b73656465, i=i at entry=0x7fffd2814cc0, value=value at entry=0x7fffd2814cb8, key=key at entry=0x0) at ../src/basic/hashmap.c:715
#2  0x00007f62ef3341d7 in set_iterate (s=<optimized out>, i=i at entry=0x7fffd2814cc0, value=value at entry=0x7fffd2814cb8) at ../src/basic/hashmap.c:736
#3  0x000055b8fbc76c67 in dns_query_candidate_go (c=c at entry=0x55b8fd390bb0) at ../src/resolve/resolved-dns-query.c:152
#4  0x000055b8fbc75dfc in dns_query_candidate_notify (c=c at entry=0x55b8fd390bb0) at ../src/resolve/resolved-dns-query.c:312
#5  0x000055b8fbc76058 in dns_transaction_complete (t=t at entry=0x55b8fd394ec0, state=state at entry=DNS_TRANSACTION_RCODE_FAILURE) at ../src/resolve/resolved-dns-transaction.c:350
#6  0x000055b8fbc76a1d in dns_transaction_process_dnssec (t=0x55b8fd394ec0) at ../src/resolve/resolved-dns-transaction.c:832
#7  0x000055b8fbc6f9b6 in dns_transaction_process_reply (t=t at entry=0x55b8fd394ec0, p=p at entry=0x55b8fd39e210) at ../src/resolve/resolved-dns-transaction.c:1194
#8  0x000055b8fbc703ab in on_dns_packet (s=<optimized out>, fd=<optimized out>, revents=<optimized out>, userdata=0x55b8fd394ec0) at ../src/resolve/resolved-dns-transaction.c:1248
#9  0x00007f62ef2a4507 in source_dispatch (s=s at entry=0x55b8fd392260) at ../src/libsystemd/sd-event/sd-event.c:3193
#10 0x00007f62ef2a47a1 in sd_event_dispatch (e=e at entry=0x55b8fd37bf30) at ../src/libsystemd/sd-event/sd-event.c:3634
#11 0x00007f62ef2a61d8 in sd_event_run (e=e at entry=0x55b8fd37bf30, timeout=timeout at entry=18446744073709551615) at ../src/libsystemd/sd-event/sd-event.c:3692
#12 0x00007f62ef2a63f7 in sd_event_loop (e=0x55b8fd37bf30) at ../src/libsystemd/sd-event/sd-event.c:3714
#13 0x000055b8fbc4fb8a in run (argv=<optimized out>, argc=<optimized out>) at ../src/resolve/resolved.c:84
#14 main (argc=<optimized out>, argv=<optimized out>) at ../src/resolve/resolved.c:91

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https://bugs.launchpad.net/bugs/1882547

Title:
  systemd-resolved dumps core all the time

Status in systemd package in Ubuntu:
  New

Bug description:
  It dumps core all the time.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: systemd 245.4-4ubuntu3.1
  ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
  Uname: Linux 5.4.0-33-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.2
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Mon Jun  8 16:51:11 2020
  ExecutablePath: /usr/lib/systemd/systemd-resolved
  InstallationDate: Installed on 2019-09-30 (252 days ago)
  InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  MachineType: Dell Inc. Precision 5530
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-33-generic root=/dev/mapper/kubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /usr/lib/systemd/system/rc-local.service → /usr/lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /usr/lib/systemd/system/user at .service → /usr/lib/systemd/system/user at .service.d/timeout.conf
   
   2 overridden configuration files found.
  UpgradeStatus: Upgraded to focal on 2020-05-28 (11 days ago)
  dmi.bios.date: 08/22/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.13.0
  dmi.board.name: 0FP2W2
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr1.13.0:bd08/22/2019:svnDellInc.:pnPrecision5530:pvr:rvnDellInc.:rn0FP2W2:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: Precision
  dmi.product.name: Precision 5530
  dmi.product.sku: 087D
  dmi.sys.vendor: Dell Inc.
  mtime.conffile..etc.systemd.logind.conf: 2019-11-18T09:50:53.885999
  mtime.conffile..etc.systemd.resolved.conf: 2020-06-04T14:51:08.011600

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