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
I wonder if the latest update to Jammy has fixed the issue? Is this
issue still occurring for you when upgrading to the Jammy package
version 2.90-0ubuntu0.22.04.1 Julia?
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So, I tossed the change because I wanted to try and produce the failure.
I tried to re-create it, but didn't have the best of luck which makes me
think I masked the issue a bit too well. Playing with valgrind has me
questioning reality:
==1119241== ERROR SUMMARY: 9 errors from 6 contexts
Can you paste the change you're using that seems to help? Maybe getting
some eyes on it might help point in a direction? Not that I have lots of
extra cycles.
And I didn't expect the change I made to help, that failure probably
never happens, and if you're just dealing with IPv4 it won't come
Petr messaged me and suggested maybe we try using rr to capture the
execution and failure to aid in debugging, unfortunately the cpu
performance events are unavailable on the machine I'm attempting
reproduction on.
I did manage to spend a little time the last two days adding some
additional debug
Coredump obtained from dnsmasq-base_2.90-0ubuntu0.22.04.1_amd64.deb
** Attachment added:
"core.dnsmasq.65534.9aed02ce9d8a44b9845ff26acd24ad62.34.170932239200.zst"
Using instructions at https://askubuntu.com/questions/41610/how-do-i-
rebuild-a-package-to-include-debugging-information built a package with
working debug symbols.
(gdb) bt
#0 0x7f21c90499fc in pthread_kill () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x7f21c8ff5476 in raise () from
This is from v2.90 from the ubuntu packaging:
Stack trace of thread 34:
#0 0x7f21c90499fc pthread_kill (libc.so.6 + 0x969fc)
#1 0x7f21c8ff5476 raise (libc.so.6 + 0x42476)
#2 0x7f21c8fdb7f3 abort (libc.so.6 +
>From that trace, it looks like it is in this code in dhcp_config_free()
when it makes the free() call:
#ifdef HAVE_DHCP6
if (config->flags & CONFIG_ADDR6)
{
struct addrlist *addr, *tmp;
for (addr = config->addr6; addr; addr = tmp)
{
So, trying to at least get symbols for the dnsmasq binary has been
largely unsucessful, so i build v2.90 from dnsmasq git, and here is what
I got:
Found module linux-vdso.so.1 with build-id:
975d8292a19f8c241322ae7eb151b63f4f01d8e2
Found module
Listing... Done
dnsmasq-base-lua/unknown,unknown 2.90-0ubuntu0.22.04.1 amd64
dnsmasq-base/unknown,unknown,now 2.90-0ubuntu0.22.04.1 amd64
[installed,automatic]
dnsmasq-utils/unknown,unknown,now 2.90-0ubuntu0.22.04.1 amd64 [installed]
dnsmasq/unknown,unknown,now 2.90-0ubuntu0.22.04.1 all
** Attachment added: "core dump file from 2.90 on Ubuntu Jammy"
https://bugs.launchpad.net/ironic/+bug/2026757/+attachment/5751256/+files/dnsmasq-jammy-2.90-package-coredumpctl_dump.core
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** Attachment added: "coredumpctl info output for 2.90 from Ubuntu Jammy"
https://bugs.launchpad.net/ironic/+bug/2026757/+attachment/5751229/+files/dnsmasq-jammy-2.90-package-coredumpctl_info
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** Attachment added: "core dump file from 2.90 on Ubuntu Jammy"
https://bugs.launchpad.net/ironic/+bug/2026757/+attachment/5751255/+files/dnsmasq-jammy-2.90-package-coredumpctl_dump.core
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Took some effort, but I've managed to capture a core dump
root@np0036907443:/opt/stack/dnsmasq# coredumpctl info 328293
PID: 328293 (dnsmasq)
UID: 65534 (nobody)
GID: 30 (dip)
Signal: 6 (ABRT)
Timestamp: Fri 2024-03-01 16:19:37 UTC (2min 34s ago)
https://lists.thekelleys.org.uk/pipermail/dnsmasq-
discuss/2023q2/017134.html and original post relates.
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https://bugs.launchpad.net/bugs/2026757
Title:
Indeed, and unfortunately it seems like I've been able to identify the
root cause which is still present in 2.90. What changed, we're no longer
seeing a segfault which was the tell-tale sign we were looking for, but
instead we just see it quietly exit with no trace. This led me to
getting a setup
dnsmasq in Jammy was updated to a 2.90 based to resolve some security
issues.
As a result this bug may have been fixed by the rollforward to a new
version.
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Noting that there's very little action Ironic can take on this bug, but
marking it triaged to get it out of our dashboard. If there's anything
Ironic contributors or CI can do to move this forward, please let us
know.
** Changed in: ironic
Status: New => Triaged
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