[Bug 1809438] Re: systemd-resolved segfaults

Sun Mar 31 10:56:48 UTC 2019

not sure if this gives helpful information, but here is a backtrace:

# gdb --pid=26353
GNU gdb (Ubuntu 8.1-0ubuntu3) 8.1.0.20180409-git
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Attaching to process 26353
Reading symbols from target:/lib/systemd/systemd-resolved...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libc.so.6...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu//libc-2.27.so...done.
done.
Reading symbols from target:/lib/systemd/libsystemd-shared-237.so...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libgpg-error.so.0...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libm.so.6...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu//libm-2.27.so...done.
done.
Reading symbols from target:/lib/x86_64-linux-gnu/libgcrypt.so.20...(no debugging symbols found)...done.
Reading symbols from target:/lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/librt.so.1...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu//librt-2.27.so...done.
done.
Reading symbols from target:/lib/x86_64-linux-gnu/libcap.so.2...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libacl.so.1...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libcryptsetup.so.12...(no debugging symbols found)...done.
Reading symbols from target:/usr/lib/x86_64-linux-gnu/libip4tc.so.0...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libseccomp.so.2...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libselinux.so.1...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libidn.so.11...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/liblzma.so.5...(no debugging symbols found)...done.
Reading symbols from target:/usr/lib/x86_64-linux-gnu/liblz4.so.1...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libblkid.so.1...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libpthread.so.0...Reading symbols from /usr/lib/debug/.build-id/28/c6aade70b2d40d1f0f3d0a1a0cad1ab816448f.debug...done.
done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Reading symbols from target:/lib/x86_64-linux-gnu/libattr.so.1...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libuuid.so.1...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libdevmapper.so.1.02.1...(no debugging symbols found)...done.
Reading symbols from target:/usr/lib/x86_64-linux-gnu/libargon2.so.0...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libjson-c.so.3...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libpcre.so.3...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libdl.so.2...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu//libdl-2.27.so...done.
done.
Reading symbols from target:/lib/x86_64-linux-gnu/libudev.so.1...(no debugging symbols found)...done.
Reading symbols from target:/lib/x86_64-linux-gnu/libnss_compat.so.2...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu//libnss_compat-2.27.so...done.
done.
Reading symbols from target:/lib/x86_64-linux-gnu/libnss_nis.so.2...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu//libnss_nis-2.27.so...done.
done.
Reading symbols from target:/lib/x86_64-linux-gnu/libnsl.so.1...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu//libnsl-2.27.so...done.
done.
Reading symbols from target:/lib/x86_64-linux-gnu/libnss_files.so.2...Reading symbols from /usr/lib/debug/lib/x86_64-linux-gnu//libnss_files-2.27.so...done.
done.
0x00007f7016940b77 in epoll_wait (epfd=4, events=0x7fffaadc3100, maxevents=14, timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
30	../sysdeps/unix/sysv/linux/epoll_wait.c: No such file or directory.
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) n
Program not restarted.
(gdb) c
Continuing.

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  __GI_raise (sig=sig at entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007f701685f801 in __GI_abort () at abort.c:79
#2  0x00007f7016428676 in log_assert_failed_realm () from target:/lib/systemd/libsystemd-shared-237.so
#3  0x000055dfa6e93af1 in ?? ()
#4  0x000055dfa6e93c0b in ?? ()
#5  0x00007f701644441e in ?? () from target:/lib/systemd/libsystemd-shared-237.so
#6  0x00007f701644469a in sd_event_dispatch () from target:/lib/systemd/libsystemd-shared-237.so
#7  0x00007f7016444829 in sd_event_run () from target:/lib/systemd/libsystemd-shared-237.so
#8  0x00007f7016444a6b in sd_event_loop () from target:/lib/systemd/libsystemd-shared-237.so
#9  0x000055dfa6e8e72b in ?? ()
#10 0x00007f7016840b97 in __libc_start_main (main=0x55dfa6e8d300, argc=1, argv=0x7fffaadc34f8, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fffaadc34e8) at ../csu/libc-start.c:310
#11 0x000055dfa6e8edfa in ?? ()

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https://bugs.launchpad.net/bugs/1809438

Title:
  systemd-resolved segfaults

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  I regularly (once almost every hour) get segfaults resported in
  systemd-resolved. The syslog is not always the same:

  Dec 21 06:59:21 marshall kernel: [988042.071003] systemd-resolve[15794]: segfault at e60e8ad514 ip 000000e60e8ad514 sp 00007ffe0376e748 error 14 in systemd-resolved[556f74bcf000+59000]
  Dec 21 06:59:21 marshall systemd[1]: systemd-resolved.service: Main process exited, code=dumped, status=11/SEGV
  Dec 21 06:59:21 marshall systemd[1]: systemd-resolved.service: Failed with result 'core-dump'.

  Dec 21 08:17:47 marshall kernel: [992748.334333] systemd-resolve[16943]: segfault at 2a11d9b0 ip 00007f4810f5ad26 sp 00007fff544db0f0 error 4 in libsystemd-shared-237.so[7f4810e1f000+1b5000]
  Dec 21 08:17:47 marshall systemd[1]: systemd-resolved.service: Main process exited, code=dumped, status=11/SEGV
  Dec 21 08:17:47 marshall systemd[1]: systemd-resolved.service: Failed with result 'core-dump'.

  Dec 21 06:22:45 marshall systemd-resolved[15727]: Assertion 'p->n_ref > 0' failed at ../src/resolve/resolved-dns-packet.c:210, function dns_packet_unref(). Aborting.
  Dec 21 06:22:45 marshall systemd[1]: systemd-resolved.service: Main process exited, code=dumped, status=6/ABRT
  Dec 21 06:22:45 marshall systemd[1]: systemd-resolved.service: Failed with result 'core-dump'.

  Dec 21 06:17:46 marshall systemd-resolved[15662]: Assertion 'DNS_TRANSACTION_IS_LIVE(q->state)' failed at ../src/resolve/resolved-dns-query.c:540, function dns_query_complete(). Aborting.
  Dec 21 06:17:46 marshall systemd[1]: systemd-resolved.service: Main process exited, code=dumped, status=6/ABRT
  Dec 21 06:17:46 marshall systemd[1]: systemd-resolved.service: Failed with result 'core-dump'.

  The system in question uses dnsmasq as local DNS server. Logging that is probably unrelated, but often seen (possibly due to the setup with dnsmasq) is:
  dec 21 10:22:00 marshall systemd-resolved[3183]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
  dec 21 10:17:15 marshall systemd-resolved[3183]: Using degraded feature set (TCP) for DNS server 127.0.0.1.

  # dpkg --status systemd
  Package: systemd
  Installed-Size: 12444
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Architecture: amd64
  Multi-Arch: foreign
  Version: 237-3ubuntu10.9

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