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
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:
dnsmasq on Ubuntu Jammy crashes
** 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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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
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)
** 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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** 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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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
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 +
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
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
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
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