Yes, still happens with 2.90-0ubuntu0.22.04.1.
It is a problem with the upstream code as far as I can tell from
dnsmasq, not the ubuntu package build itself.
Message: Process 1671294 (dnsmasq) of user 65534 dumped core.
Found module linux-vdso.so.1 with build-id:
975d8292a19f8c241322ae7eb151b63f4f01d8e2
Found module ld-linux-x86-64.so.2 with build-id:
15921ea631d9f36502d20459c43e5c85b7d6ab76
Found module libc.so.6 with build-id:
c289da5071a3399de893d2af81d6a30c62646e1e
Found module dnsmasq with build-id:
aa89f97a7ccd45a1c50674eb7d5da473d605d476
Stack trace of thread 1671294:
#0 0x00007fbd66ca29fc __pthread_kill_implementation (libc.so.6
+ 0x969fc)
#1 0x00007fbd66c4e476 __GI_raise (libc.so.6 + 0x42476)
#2 0x00007fbd66c347f3 __GI_abort (libc.so.6 + 0x287f3)
#3 0x00007fbd66c95676 __libc_message (libc.so.6 + 0x89676)
#4 0x00007fbd66caccfc malloc_printerr (libc.so.6 + 0xa0cfc)
#5 0x00007fbd66caea44 _int_free (libc.so.6 + 0xa2a44)
#6 0x00007fbd66cb1453 __GI___libc_free (libc.so.6 + 0xa5453)
#7 0x0000555899cd1a32 dhcp_netid_free (dnsmasq + 0x16a32)
#8 0x0000555899cdc001 clear_dynamic_conf (dnsmasq + 0x21001)
#9 0x0000555899ce58af clear_cache_and_reload (dnsmasq +
0x2a8af)
#10 0x0000555899cc5ad7 async_event (dnsmasq + 0xaad7)
#11 0x00007fbd66c35d90 __libc_start_call_main (libc.so.6 +
0x29d90)
#12 0x00007fbd66c35e40 __libc_start_main_impl (libc.so.6 +
0x29e40)
#13 0x0000555899cc6375 _start (dnsmasq + 0xb375)
--
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https://bugs.launchpad.net/bugs/2026757
Title:
dnsmasq on Ubuntu Jammy crashes on neutron-dhcp-agent updates
Status in Ironic:
Triaged
Status in neutron:
New
Status in dnsmasq package in Ubuntu:
Invalid
Status in dnsmasq source package in Jammy:
Incomplete
Status in dnsmasq source package in Kinetic:
Won't Fix
Status in dnsmasq source package in Lunar:
Invalid
Status in dnsmasq source package in Mantic:
Invalid
Bug description:
The Ironic project's CI has been having major blocking issues moving
to utilizing Ubuntu Jammy and with some investigation we were able to
isolate the issues down to the dhcp updates causing dnsmasq to crash
on Ubuntu Jammy, which ships with dnsmasq 2.86. This issue sounds
similar to an issue known about to the dnsmasq maintainers, where
dnsmasq would crash with updates occurring due to configuration
refresh[0].
This resulted in us upgrading dnsmasq to the version which ships with
Ubuntu Lunar.
Which was no better. Dnsmasq still crashed upon record updates for
addresses and ports getting configuration added/changed/removed.
We later downgraded to the version of dnsmasq shipped in Ubuntu Focal,
and dnsmasq stopped crashing and appeared stable enough to utilize for
CI purposes.
** Kernel log from Ubuntu Jammy Package **
[229798.876726] dnsmasq[81586]: segfault at 7c28 ip 00007f6e8313147e sp
00007fffb3d6f830 error 4 in libc.so.6[7f6e830b4000+195000]
[229798.876745] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[229805.444912] dnsmasq[401428]: segfault at dce8 ip 00007fe63bf6a47e sp
00007ffdb105b440 error 4 in libc.so.6[7fe63beed000+195000]
[229805.444933] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[230414.213448] dnsmasq[401538]: segfault at 78b8 ip 00007f12160e447e sp
00007ffed6ef2190 error 4 in libc.so.6[7f1216067000+195000]
[230414.213467] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[230465.098989] dnsmasq[402665]: segfault at c378 ip 00007f81458f047e sp
00007fff0db334a0 error 4 in libc.so.6[7f8145873000+195000]
[230465.099005] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[231787.247374] dnsmasq[402863]: segfault at 7318 ip 00007f3940b9147e sp
00007ffc8df4f010 error 4 in libc.so.6[7f3940b14000+195000]
[231787.247392] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[231844.886399] dnsmasq[405182]: segfault at dc58 ip 00007f32a29e147e sp
00007ffddedd7480 error 4 in libc.so.6[7f32a2964000+195000]
[231844.886420] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[234692.482154] dnsmasq[405289]: segfault at 67d8 ip 00007fab0c5c447e sp
00007fffd6fd8fa0 error 4 in libc.so.6[7fab0c547000+195000]
[234692.482173] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
** Kernel log entries from Ubuntu Lunar package **
[234724.842339] dnsmasq[409843]: segfault at fffffffffffffffd ip
00007f35a147647e sp 00007ffd536038c0 error 5 in libc.so.6[7f35a13f9000+195000]
[234724.842368] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[234784.918116] dnsmasq[410019]: segfault at fffffffffffffffd ip
00007f634233947e sp 00007fff33877f20 error 5 in libc.so.6[7f63422bc000+195000]
[234784.918133] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[235022.163339] dnsmasq[410151]: segfault at fffffffffffffffd ip
00007f21dd37f47e sp 00007fff9bf416d0 error 5 in libc.so.6[7f21dd302000+195000]
[235022.163362] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[235024.831325] dnsmasq[410445]: segfault at fffffffffffffffd ip
00007f7edf02147e sp 00007ffc4fb19cd0 error 5 in libc.so.6[7f7edefa4000+195000]
[235024.831354] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[236052.793683] dnsmasq[410630]: segfault at fffffffffffffffd ip
00007f3046ca147e sp 00007ffe5583df50 error 5 in libc.so.6[7f3046c24000+195000]
[236052.793704] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
[236105.451351] dnsmasq[412107]: segfault at fffffffffffffffd ip
00007f4425bcd47e sp 00007fffd5337560 error 5 in libc.so.6[7f4425b50000+195000]
[236105.451368] Code: 98 13 00 e8 04 b9 ff ff 0f 1f 40 00 f3 0f 1e fa 48 85
ff 0f 84 bb 00 00 00 55 48 8d 77 f0 53 48 83 ec 18 48 8b 1d 92 39 17 00 <48> 8b
47 f8 64 8b 2b a8 02 75 57 48 8b 15 18 39 17 00 64 48 83 3a
** The command line the process is launched with **
dnsmasq --no-hosts --pid-
file=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/pid
--dhcp-
hostsfile=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/host
--addn-
hosts=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/addn_hosts
--dhcp-
optsfile=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/opts
--dhcp-
leasefile=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/leases
--dhcp-match=set:ipxe,175 --dhcp-userclass=set:ipxe6,iPXE --local-
service--bind-dynamic --dhcp-
range=set:subnet-3c1445e7-6f7d-4e62-997f-627bc53da72c,10.1.0.0,static,255.255.255.192,86400s
--dhcp-option-force=option:mtu,1380 --dhcp-lease-max=64 --conf-
file=/dev/null --domain=openstacklocal
** Neutron Logging **
Jul 10 15:26:01 np0034614991 neutron-dhcp-agent[60941]: DEBUG
neutron.agent.dhcp.agent [-] neutron.agent.dhcp.agent.DhcpAgentWithStateReport
method _port_delete called with arguments ({'port_id':
'bdeaa43c-687c-4e60-a24e-3725d6353828', 'network_id':
'c1ca059e-350d-4d78-9330-600f7315c380', 'fixed_ips': [{'subnet_id':
'3c1445e7-6f7d-4e62-997f-627bc53da72c', 'ip_address': '10.1.0.14'},
{'subnet_id': '54bc71f6-bff5-417d-9e4b-1f5f58ed6318', 'ip_address':
'fdd9:92b1:9e2c:0:5054:ff:fe44:5c9f'}], 'priority': 6},) {} {{(pid=60941)
wrapper /usr/local/lib/python3.10/dist-packages/oslo_log/helpers.py:65}}
Jul 10 15:26:01 np0034614991 neutron-dhcp-agent[60941]: DEBUG
neutron.agent.dhcp.agent [-] Calling driver for network:
c1ca059e-350d-4d78-9330-600f7315c380/seg=None action: reload_allocations
{{(pid=60941) _call_driver /opt/stack/neutron/neutron/agent/dhcp/agent.py:246}}
Jul 10 15:26:01 np0034614991 neutron-dhcp-agent[60941]: DEBUG
oslo_concurrency.processutils [-] Running cmd (subprocess): ip netns exec
qdhcp-c1ca059e-350d-4d78-9330-600f7315c380 dhcp_release tapbb6348d9-39
10.1.0.14 52:54:00:44:5c:9f {{(pid=78114) execute
/usr/local/lib/python3.10/dist-packages/oslo_concurrency/processutils.py:384}}
Jul 10 15:26:01 np0034614991 neutron-dhcp-agent[60941]: DEBUG
oslo_concurrency.processutils [-] CMD "ip netns exec
qdhcp-c1ca059e-350d-4d78-9330-600f7315c380 dhcp_release tapbb6348d9-39
10.1.0.14 52:54:00:44:5c:9f" returned: 0 in 0.011s {{(pid=78114) execute
/usr/local/lib/python3.10/dist-packages/oslo_concurrency/processutils.py:422}}
Jul 10 15:26:01 np0034614991 neutron-dhcp-agent[60941]: DEBUG
oslo.privsep.daemon [-] privsep: reply[8a4f2794-3b63-4f8d-9604-53dd6a4a868c]:
(4, ('', '')) {{(pid=78114) _call_back
/usr/local/lib/python3.10/dist-packages/oslo_privsep/daemon.py:501}}
Jul 10 15:26:01 np0034614991 neutron-dhcp-agent[60941]: DEBUG
oslo_concurrency.processutils [-] Running cmd (subprocess): ip netns exec
qdhcp-c1ca059e-350d-4d78-9330-600f7315c380 dhcp_release tapbb6348d9-39
10.1.0.14 52:54:00:44:5c:9f 01:52:54:00:44:5c:9f {{(pid=78114) execute
/usr/local/lib/python3.10/dist-packages/oslo_concurrency/processutils.py:384}}
Jul 10 15:26:01 np0034614991 neutron-dhcp-agent[60941]: DEBUG
oslo_concurrency.processutils [-] CMD "ip netns exec
qdhcp-c1ca059e-350d-4d78-9330-600f7315c380 dhcp_release tapbb6348d9-39
10.1.0.14 52:54:00:44:5c:9f 01:52:54:00:44:5c:9f" returned: 0 in 0.011s
{{(pid=78114) execute
/usr/local/lib/python3.10/dist-packages/oslo_concurrency/processutils.py:422}}
Jul 10 15:26:01 np0034614991 neutron-dhcp-agent[60941]: DEBUG
oslo.privsep.daemon [-] privsep: reply[33a91aed-bc58-48dd-b673-d4a4d5da54f6]:
(4, ('', '')) {{(pid=78114) _call_back
/usr/local/lib/python3.10/dist-packages/oslo_privsep/daemon.py:501}}
Jul 10 15:26:02 np0034614991 neutron-dhcp-agent[60941]: DEBUG
neutron.agent.linux.dhcp [-] Building host file:
/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/host
{{(pid=60941) _output_hosts_file
/opt/stack/neutron/neutron/agent/linux/dhcp.py:956}}
Jul 10 15:26:02 np0034614991 neutron-dhcp-agent[60941]: DEBUG
neutron.agent.linux.utils [-] Running command: ['env', 'LC_ALL=C',
'PATH=/sbin:/usr/sbin', 'dnsmasq', '--test', '--dhcp-host=tag:foo']
{{(pid=60941) create_process
/opt/stack/neutron/neutron/agent/linux/utils.py:84}}
Jul 10 15:26:02 np0034614991 neutron-dhcp-agent[60941]: DEBUG
neutron.agent.linux.dhcp [-] Done building host file
/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/host
{{(pid=60941) _output_hosts_file
/opt/stack/neutron/neutron/agent/linux/dhcp.py:997}}
Jul 10 15:26:02 np0034614991 neutron-dhcp-agent[60941]: DEBUG
oslo.privsep.daemon [-] privsep: reply[f3dd1224-fe8c-4fb0-8113-699e779df64e]:
(4, ('', '', 0)) {{(pid=62248) _call_back
/usr/local/lib/python3.10/dist-packages/oslo_privsep/daemon.py:501}}
Jul 10 15:27:00 np0034614991 neutron-dhcp-agent[60941]: DEBUG
oslo_concurrency.lockutils [-] Acquiring lock "_check_child_processes" by
"neutron.agent.linux.external_process.ProcessMonitor._check_child_processes"
{{(pid=60941) inner
/usr/local/lib/python3.10/dist-packages/oslo_concurrency/lockutils.py:404}}
Jul 10 15:27:00 np0034614991 neutron-dhcp-agent[60941]: DEBUG
oslo_concurrency.lockutils [-] Lock "_check_child_processes" acquired by
"neutron.agent.linux.external_process.ProcessMonitor._check_child_processes" ::
waited 0.001s {{(pid=60941) inner
/usr/local/lib/python3.10/dist-packages/oslo_concurrency/lockutils.py:409}}
Jul 10 15:27:00 np0034614991 neutron-dhcp-agent[60941]: ERROR
neutron.agent.linux.external_process [-] dnsmasq for dhcp with uuid
c1ca059e-350d-4d78-9330-600f7315c380 not found. The process should not have died
Jul 10 15:27:00 np0034614991 neutron-dhcp-agent[60941]: WARNING
neutron.agent.linux.external_process [-] Respawning dnsmasq for uuid
c1ca059e-350d-4d78-9330-600f7315c380
Jul 10 15:27:00 np0034614991 neutron-dhcp-agent[60941]: DEBUG
neutron.agent.linux.utils [-] Running command (rootwrap daemon): ['ip',
'netns', 'exec', 'qdhcp-c1ca059e-350d-4d78-9330-600f7315c380', 'env',
'PROCESS_TAG=dnsmasq-c1ca059e-350d-4d78-9330-600f7315c380', 'dnsmasq',
'--no-hosts', '',
'--pid-file=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/pid',
'--dhcp-hostsfile=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/host',
'--addn-hosts=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/addn_hosts',
'--dhcp-optsfile=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/opts',
'--dhcp-leasefile=/opt/stack/data/neutron/dhcp/c1ca059e-350d-4d78-9330-600f7315c380/leases',
'--dhcp-match=set:ipxe,175', '--dhcp-userclass=set:ipxe6,iPXE',
'--local-service', '--bind-dynamic',
'--dhcp-range=set:subnet-3c1445e7-6f7d-4e62-997f-627bc53da72c,10.1.0.0,static,255.255.255.192,86400s',
'--dhcp-option-force=option:mtu,1380', '--dhcp-l
ease-max=64', '--conf-file=/dev/null', '--domain=openstacklocal']
{{(pid=60941) execute_rootwrap_daemon
/opt/stack/neutron/neutron/agent/linux/utils.py:108}}
We don't believe this is a neutron bug, at least outright, but suspect
neutron is also likely encountering this issue as well, at least with any sort
of exhaustive test jobs. Most of Ironic's one job tests would pass with this
dnsmasq, it was only where we continually ran new test scenarios that we would
see this issue crop up and cause failures.
In the mean time, the ironic project will likely downgrade dnsmasq to
unblock it's CI.
[0]: https://lists.thekelleys.org.uk/pipermail/dnsmasq-
discuss/2022q3/016562.html
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https://bugs.launchpad.net/ironic/+bug/2026757/+subscriptions
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