Hi,
i'm trying hard to create that backtrace, but it doesn't work:

 ...
dynamically loaded /usr/lib/x86_64-linux-gnu/libxml2.so.2.9.10 needs package 
libxml2, queueing
Installing extra package nginx-core to get ExecutablePath
Get:1  [3029 kB]
Fetched 3029 kB in 0s (0 B/s)
Extracting downloaded debs...
dpkg-source: info: extracting nginx in nginx-1.18.0
dpkg-source: info: unpacking nginx_1.18.0.orig.tar.gz
dpkg-source: info: unpacking nginx_1.18.0-0ubuntu1.2.debian.tar.xz
dpkg-source: info: using patch list from debian/patches/series
dpkg-source: info: applying 
0002-Make-sure-signature-stays-the-same-in-all-nginx-buil.patch
dpkg-source: info: applying 
0003-define_gnu_source-on-other-glibc-based-platforms.patch
dpkg-source: info: applying ubuntu-branding.patch
dpkg-source: info: applying nginx-fix-pidfile.patch
dpkg-source: info: applying CVE-2021-23017-1.patch
dpkg-source: info: applying CVE-2021-23017-2.patch
W: Der Download wird als root und nicht Sandbox-geschützt durchgeführt, da auf 
die Datei »nginx_1.18.0-0ubuntu1.2.dsc« durch den Benutzer »_apt« nicht 
zugegriffen werden kann. - pkgAcquire::Run (13: Permission denied)
--- stack trace ---
#0  0x00007fbf59548593 in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.
--- source code stack trace ---
#0  0x00007fbf59548593 in ?? ()
#1  0x0000000000000000 in ?? ()

It seems the symbols aren't there. Can you help me here with this problem or do 
i have to ask that anywhere else ?
Sorry, i'm completely new to filing a bug in Ubuntu.

Thanks,

Bernd


** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-23017

** Attachment added: "no symbols creating backtrace.txt"
   
https://bugs.launchpad.net/ubuntu/+source/nginx/+bug/1952614/+attachment/5545793/+files/no%20symbols%20creating%20backtrace.txt

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https://bugs.launchpad.net/bugs/1952614

Title:
  nginx crashes with dump because of segfault

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