Any update on this? As of dunst 1.8.1-1 (Debian testing/bookworm) this is still an issue. However, in my case, a coredump is also generated when it fails due to a SIGTRAP.
$ systemctl --user status dunst.service × dunst.service - Dunst notification daemon Loaded: loaded (/usr/lib/systemd/user/dunst.service; enabled; preset: enabled) Active: failed (Result: core-dump) since Mon 2022-09-26 05:38:17 UTC; 20min ago Docs: man:dunst(1) Process: 1296 ExecStart=/usr/bin/dunst (code=dumped, signal=TRAP) Main PID: 1296 (code=dumped, signal=TRAP) CPU: 22ms Sep 26 05:38:17 debian dunst[1296]: Invalid MIT-MAGIC-COOKIE-1 key Sep 26 05:38:17 debian dunst[1296]: WARNING: Cannot open X11 display. Sep 26 05:38:17 debian dunst[1296]: ERROR: [ get_x11_output:0065] Couldn't initialize X11 output. Aborting... Sep 26 05:38:17 debian systemd[1279]: Starting Dunst notification daemon... Sep 26 05:38:17 debian systemd-coredump[1306]: Process 1296 (dunst) of user 1000 dumped core. Module linux-vdso.so.1 with build-id c35c947b072ff69b395cd326b83b24630f2c5065 Module libmd.so.0 with build-id bfcdab3e6fabdc0d6f3e3e7d562330e80601a5af Module libbsd.so.0 with build-id 974e49045a7855a26d47583928fa20dbbfd4f530 Module libbrotlicommon.so.1 with build-id 3c671f721b58fd96b70ba426a215b3c43847bbf5 Module libblkid.so.1 with build-id d3e947026c74ed40701063d17ae59a2f6e51abcb Module libXdmcp.so.6 with build-id 1d12a8566670c95b1b02e341400060d2d825aade Module libXau.so.6 with build-id 84ffa90fee1b716cdc7d8349be47ed6ca4761b75 Module libbrotlidec.so.1 with build-id 1160b28572b6a6fc5674f5db1333716d4ba9e55f Module libdatrie.so.1 with build-id 57f62fe2ce6d6db200f0f8cfee3cc987b25a9e2f Module libuuid.so.1 with build-id 6b0f1c26b65771068f1daa425dae3f769ce41a6c Module libexpat.so.1 with build-id 0fa805792649d58f26fa59d23e9f5355ba67cca2 Module libgraphite2.so.3 with build-id 5b00ca1eda239ea043d7eae3b0fd4481560a907e Module libpcre2-8.so.0 with build-id 5aa43e3778622f4b95261331e97a45be5b87481d Module libffi.so.8 with build-id bb0fa5371874ba431e7cd9dc2df93922de436fa9 Module libselinux.so.1 with build-id 827b23e6391a3374fa79e36bca36c41c8e6d29e4 Module libmount.so.1 with build-id e29bc51dddfc4e370eb7eac9ff29df81efdbf22c Module libjpeg.so.62 with build-id 12da81e724cd81f4c71e54182d94d21f2bab27df Module libgmodule-2.0.so.0 with build-id 9f28f23ebfa524093fe5a2d1a8d086eaf3824645 Module libdl.so.2 with build-id 7a460055e0485a14f1d19cd8f8b8a0e77319fa44 Module libz.so.1 with build-id 19168f84642e8fe27700f92388598565e59048ee Module libXrender.so.1 with build-id 23dd581f5d93297dc5c508f03e224f9860af8217 Module libxcb-render.so.0 with build-id ca78dfc48f5a2593d9dc3b1d439740c6abad3f1c Module libxcb.so.1 with build-id 81156ba79b0ca3ca8d015453e333d16c3fcdc277 Module libxcb-shm.so.0 with build-id 77958cefc38a0b1edb4d0f4b76817b05ac6ec605 Module libpng16.so.16 with build-id 24720328fb61293ea32d8283c030fc0431082f65 Module libfreetype.so.6 with build-id 5d03f612aa76f7a175f1f23e5275809b0db692a4 Module libpixman-1.so.0 with build-id 2ba0d88f718a0fef93d759cfc90bc650cdee38ba Module libthai.so.0 with build-id 11b774e6b958fa6734f1a721527e1596e34ecd00 Module libfribidi.so.0 with build-id df6a1c7bc544c74c18a8635e3e65965a1fb529c3 Module libfontconfig.so.1 with build-id 3209e243ebaf08c058f6a17b9037cbdfecc3e72c Module libharfbuzz.so.0 with build-id d4a75db68352b8ea150e830e6720dc7f241b6c6c Module libpangoft2-1.0.so.0 with build-id 7665226d35e490413282233bb338a8ad7fa67343 Module ld-linux-x86-64.so.2 with build-id 677c6b03c07000faccc863eaf95e426b1d419430 Module libc.so.6 with build-id ef3afb43092687d7fcc8167fabdee73f4a3287f1 Module libpthread.so.0 with build-id fba10b5687be23f32ae49c9ca70f036e4156e61d Module libwayland-cursor.so.0 with build-id 67f712e24c0ebf8ea5be5410c32a34d5b5271b2b Module libwayland-client.so.0 with build-id 296271640039da17030592ae7c798e4d785d3835 Module libglib-2.0.so.0 with build-id be501444301099c646ec77871ca83c5d6a530313 Module libgobject-2.0.so.0 with build-id bb1321e36df16e444469e4e2fb57323bf2c2c584 Module libgio-2.0.so.0 with build-id ade73737ec816f7ec61ccd7fbf554bf613977034 Module libgdk_pixbuf-2.0.so.0 with build-id 2c2c8cf1085b910a682d0ac9078dce999e2a875f Module libXss.so.1 with build-id afbbf09d10ee939272bda7d6783cd69b6138f74c Module libXrandr.so.2 with build-id 0372dfb32a5c0d113819e1167f75c81c751373a8 Module libXext.so.6 with build-id d3ac3e1515190245564a30a611f4a2a4eb94a617 Module libXinerama.so.1 with build-id 5a76407b56b10810711c5345defbdf4e2dad3897 Module libX11.so.6 with build-id 692ceb08bd361ef2ea7caaa0926de19466d6f3ad Module libcairo.so.2 with build-id 48feebcd296c6d353cf5f6e385180362219f166a Module libpango-1.0.so.0 with build-id 56468d1b5210773cf31bb8be42a16ef199a38b86 Module libpangocairo-1.0.so.0 with build-id d625ce8d575bda90b74d2a3a89120405e3202d27 Module librt.so.1 with build-id 3a53a3002be35bd46ef7c1ce5b6c6a7aaa57b0d9 Module libm.so.6 with build-id 989a409fe23136438f2ce34b685dd738dc20c6d9 Module dunst with build-id 092a779cafdda56c03726c61f8e912689e756cf8 Stack trace of thread 1296: #0 0x00007f88f9e36d82 g_logv (libglib-2.0.so.0 + 0x5bd82) #1 0x00007f88f9e36fef g_log (libglib-2.0.so.0 + 0x5bfef) #2 0x000055999df0302a n/a (dunst + 0x1a02a) #3 0x000055999def9d70 n/a (dunst + 0x10d70) #4 0x000055999defbdb2 n/a (dunst + 0x12db2) #5 0x00007f88f9a2920a __libc_start_call_main (libc.so.6 + 0x2920a) #6 0x00007f88f9a292bc __libc_start_main_impl (libc.so.6 + 0x292bc) #7 0x000055999def75ca n/a (dunst + 0xe5ca) Stack trace of thread 1301: #0 0x00007f88f9afda3f __GI___poll (libc.so.6 + 0xfda3f) #1 0x00007f88fa0192c5 g_socket_condition_timed_wait (libgio-2.0.so.0 + 0xa62c5) #2 0x00007f88fa01a266 n/a (libgio-2.0.so.0 + 0xa7266) #3 0x00007f88f9ff3b45 g_input_stream_read (libgio-2.0.so.0 + 0x80b45) #4 0x00007f88f9fc2d1e n/a (libgio-2.0.so.0 + 0x4fd1e) #5 0x00007f88f9fc3ea4 g_buffered_input_stream_fill (libgio-2.0.so.0 + 0x50ea4) #6 0x00007f88f9fcc019 g_data_input_stream_read_line (libgio-2.0.so.0 + 0x59019) #7 0x00007f88fa0777f5 n/a (libgio-2.0.so.0 + 0x1047f5) #8 0x00007f88fa078099 n/a (libgio-2.0.so.0 + 0x105099) #9 0x00007f88fa088c85 n/a (libgio-2.0.so.0 + 0x115c85) #10 0x00007f88f9fc2027 n/a (libgio-2.0.so.0 + 0x4f027) #11 0x00007f88fa02a323 n/a (libgio-2.0.so.0 + 0xb7323) #12 0x00007f88f9e5a4ba n/a (libglib-2.0.so.0 + 0x7f4ba) #13 0x00007f88f9e59aed n/a (libglib-2.0.so.0 + 0x7eaed) #14 0x00007f88f9a87b27 start_thread (libc.so.6 + 0x87b27) #15 0x00007f88f9b0a78c __clone3 (libc.so.6 + 0x10a78c) Stack trace of thread 1300: #0 0x00007f88f9afda3f __GI___poll (libc.so.6 + 0xfda3f) #1 0x00007f88f9e2f92e n/a (libglib-2.0.so.0 + 0x5492e) #2 0x00007f88f9e2fa4c g_main_context_iteration (libglib-2.0.so.0 + 0x54a4c) #3 0x00007f88f9e2fa91 n/a (libglib-2.0.so.0 + 0x54a91) #4 0x00007f88f9e59aed n/a (libglib-2.0.so.0 + 0x7eaed) #5 0x00007f88f9a87b27 start_thread (libc.so.6 + 0x87b27) #6 0x00007f88f9b0a78c __clone3 (libc.so.6 + 0x10a78c) ELF object binary architecture: AMD x86-64 Sep 26 05:38:17 debian systemd[1279]: dunst.service: Main process exited, code=dumped, status=5/TRAP Sep 26 05:38:17 debian systemd[1279]: dunst.service: Failed with result 'core-dump'. Sep 26 05:38:17 debian systemd[1279]: Failed to start Dunst notification daemon. $ coredumpctl -S "$(uptime -s)" list dunst TIME PID UID GID SIG COREFILE EXE SIZE Mon 2022-09-26 05:38:08 UTC 922 106 111 SIGTRAP inaccessible /usr/bin/dunst n/a Mon 2022-09-26 05:38:17 UTC 1296 1000 1000 SIGTRAP present /usr/bin/dunst 241.6K