This is about a dot file related to a keysigning event:
$ cat signature.dot
digraph "unnamed" {
overlap=scale
splines=true
sep=.1
bgcolor=transparent
node [style=filled]
"02C7A73D84B0447C" [label="Eric\nBiggers" ,fillcolor="0.0,0.36666666666666664,0.5263157894736842" ]
"0393969D2D760850" [label="Johannes\nThumshirn" ,fillcolor="0.5909365781710915,0.6915544675642595,0.6825396825396826" ]
"587C5ECA5D0A306C" [label="Daniel\nWagner" ,fillcolor="0.9392961500176604,0.4085399449035813,0.5789473684210527" ]
"7D97093255A0CE7F" [label="Nicolas\nSchier" ,fillcolor="0.7341920551270742,0.49510638297872345,0.746031746031746" ]
"65BA97B9EE9C1459" [label="Michal\nWilczynski" ,fillcolor="0.9600426943968888,0.4137741046831957,0.5789473684210527" ]
"B7D2DD275D7EC087" [label="Brian\nMasney" ,fillcolor="0.7509036410120781,0.5168831168831168,0.7777777777777777" ]
"0664101D2FC252D1" [label="Julian\nBraha" ,fillcolor="0.8293212240580661,0.5117021276595745,0.746031746031746" ]
"52A00C47488094F2" [label="Petr\nMladek" ,fillcolor="0.704237007613373,0.5047619047619047,0.7777777777777777" ]
"FEAF321A8F08C9B3" [label="Waqar\nHameed" ,fillcolor="0.7364816149963951,0.5983606557377049,0.9682539682539681" ]
"224FA7E7CC82A664" [label="Vlastimil\nBabka" ,fillcolor="0.7509036410120781,0.5168831168831168,0.7777777777777777" ]
"E2DCDD9132669BD6" [label="Uwe\nKleine-König" ,fillcolor="0.8333333333333334,0.6298245614035087,1.0" ]
"7B96E8162A8CF5D1" [label="Sebastian\nAndrzej\nSiewior" ,fillcolor="0.8190193055861411,0.4902564102564102,0.7142857142857142" ]
"26BCFA05FCF60E4C" [label="Marek\nBehún" ,fillcolor="0.7886160933058904,0.38702702702702696,0.5873015873015872" ]
"1DD2101F5E0A2B84" [label="Michael\nRiesch" ,fillcolor="0.0,0.20833333333333334,0.42105263157894735" ]
"4804B4BC3F55EEFB" [label="Geert\nUytterhoeven" ,fillcolor="0.7803856488067015,0.5842105263157894,0.9047619047619047" ]
"29C93EA3499D9626" [label="Joshua\nCrofts" ,fillcolor="0.7500245025972753,0.45790697674418607,0.6825396825396826" ]
"BFDC09C1F24DFA45" [label="Miquel\nRAYNAL" ,fillcolor="0.0,0.5777777777777778,0.7894736842105263" ]
"C94035C21B4F2AEB" [label="Chen-Yu\nTsai" ,fillcolor="0.7414485935509164,0.47733333333333333,0.7142857142857142" ]
"256AEA1847BD5684" [label="Miquel\nRAYNAL" ,fillcolor="0.989159642212979,0.574962962962963,0.7894736842105263" ]
"442A4F875238B839" [label="Asbjørn\nSloth\nTønnesen" ,fillcolor="0.0,0.09523809523809523,0.3684210526315789" ]
"B0D589D46708EC99" [label="Trevor\nGamblin" ,fillcolor="0.7500245025972753,0.45790697674418607,0.6825396825396826" ]
"5937189AD3FBC665" [label="Kevin\nHilman" ,fillcolor="0.6733746130030959,0.30909090909090897,0.5238095238095237" ]
"F045C2B96991256E" [label="Laurent\nPinchart" ,fillcolor="0.5886306135357368,0.6765083440308087,0.6507936507936507" ]
"C3C92AAF3E60AED9" [label="Jerome\nBrunet" ,fillcolor="0.5536877394636015,0.5087719298245614,0.42857142857142855" ]
"9190FDF5234FE25C" [label="David\nGstir" ,fillcolor="0.4991575773698678,0.8564593301435407,0.36666666666666664" ]
"D8EED7F3C83BFA9A" [label="Sebastian\nReichel" ,fillcolor="0.5671195652173914,0.7449392712550608,0.6190476190476191" ]
"442A4F875238B839" -> "7D97093255A0CE7F"
"E2DCDD9132669BD6" -> "B7D2DD275D7EC087"
"4804B4BC3F55EEFB" -> "C94035C21B4F2AEB"
"FEAF321A8F08C9B3" -> "52A00C47488094F2"
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"587C5ECA5D0A306C" -> "0393969D2D760850"
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"FEAF321A8F08C9B3" -> "E2DCDD9132669BD6"
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"BFDC09C1F24DFA45" -> "D8EED7F3C83BFA9A"
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"4804B4BC3F55EEFB" -> "FEAF321A8F08C9B3"
"256AEA1847BD5684" -> "B7D2DD275D7EC087"
}
$ circo -T svg > signature.svg < signature.dot
Segmentation fault (core dumped)
$ coredumpctl debug
Hint: You are currently not seeing messages from other users and the system.
Users in groups 'adm', 'systemd-journal' can see all messages.
Pass -q to turn off this notice.
PID: 645851 (circo)
UID: 1000 (uwe)
GID: 1000 (uwe)
Signal: 11 (SEGV)
Timestamp: Sun 2026-10-18 19:51:41 CEST (4s ago)
Command Line: circo -T svg
Executable: /usr/sbin/libgvc6-config-update
Control Group: /user.slice/user-1000.slice/user@1000.service/app.slice/app-org.gnome.Terminal.slice/vte-spawn-eaecdc15-17e7-4a26-b090-52306c615a51.scope
Unit: user@1000.service
User Unit: vte-spawn-eaecdc15-17e7-4a26-b090-52306c615a51.scope
Slice: user-1000.slice
Owner UID: 1000 (uwe)
Boot ID: 75edb4a02d6541a3a671aac515e4e79d
Machine ID: ff4294c54e4244839f1de8a4a08e9c45
Hostname: monoceros
Storage: /var/lib/systemd/coredump/core.circo.1000.75edb4a02d6541a3a671aac515e4e79d.645851.1792345901000000.zst (present)
Size on Disk: 577.9K
Message: Process 645851 (circo) of user 1000 dumped core.
Module libgcc_s.so.1 from deb gcc-16-16.2.0-3.amd64
Module libstdc++.so.6 from deb gcc-16-16.2.0-3.amd64
Module libblkid.so.1 from deb util-linux-2.41.5-0+deb13u1.amd64
Module libmount.so.1 from deb util-linux-2.41.5-0+deb13u1.amd64
Module libatomic.so.1 from deb gcc-16-16.2.0-3.amd64
Stack trace of thread 645851:
#0 0x00007fbea46d052a aggetrec (libcgraph.so.6 + 0xc52a)
#1 0x00007fbea46cae7d agxget (libcgraph.so.6 + 0x6e7d)
#2 0x00007fbea47432d9 emit_node (libgvc.so.6 + 0x662d9)
#3 0x00007fbea474894e emit_view (libgvc.so.6 + 0x6b94e)
#4 0x00007fbea474a1b7 gvRenderJobs (libgvc.so.6 + 0x6d1b7)
#5 0x000055ab3e0b341b main (/usr/sbin/libgvc6-config-update + 0x141b)
#6 0x00007fbea44f7fba n/a (libc.so.6 + 0x29fba)
#7 0x00007fbea44f80d7 __libc_start_main (libc.so.6 + 0x2a0d7)
#8 0x000055ab3e0b34a1 _start (/usr/sbin/libgvc6-config-update + 0x14a1)
Stack trace of thread 645852:
#0 0x00007fbea45df109 syscall (libc.so.6 + 0x111109)
#1 0x00007fbea3f221c4 g_cond_wait (libglib-2.0.so.0 + 0x8f1c4)
#2 0x00007fbea3eb877b n/a (libglib-2.0.so.0 + 0x2577b)
#3 0x00007fbea3eb8c2b g_async_queue_pop (libglib-2.0.so.0 + 0x25c2b)
#4 0x00007fbea40ce2a7 n/a (libpangoft2-1.0.so.0 + 0xe2a7)
#5 0x00007fbea3f228c3 n/a (libglib-2.0.so.0 + 0x8f8c3)
#6 0x00007fbea4563058 n/a (libc.so.6 + 0x95058)
#7 0x00007fbea45e1218 n/a (libc.so.6 + 0x113218)
ELF object binary architecture: AMD x86-64
GNU gdb (Debian 16.3-1) 16.3
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Reading symbols from /usr/sbin/libgvc6-config-update...
Reading symbols from /usr/lib/debug/.build-id/c1/5c17870f79e7d1c67e126148ef6718215297a6.debug...
[New LWP 645851]
[New LWP 645852]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/circo -T svg'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007fbea46d052a in aggetrec (obj=obj@entry=0x55ab557d3200, name=0x7fbea46d602e "_AG_strdata",
mtf=mtf@entry=0) at ./lib/cgraph/rec.c:42
warning: 42 ./lib/cgraph/rec.c: No such file or directory
[Current thread is 1 (Thread 0x7fbea424b740 (LWP 645851))]
(gdb) bt
#0 0x00007fbea46d052a in aggetrec
(obj=obj@entry=0x55ab557d3200, name=0x7fbea46d602e "_AG_strdata", mtf=mtf@entry=0) at ./lib/cgraph/rec.c:42
#1 0x00007fbea46ca6f5 in agattrrec (obj=obj@entry=0x55ab557d3200) at ./lib/cgraph/attr.c:233
#2 0x00007fbea46cae7d in agxget (obj=obj@entry=0x55ab557d3200, sym=0x55ab557d2910) at ./lib/cgraph/attr.c:449
#3 0x00007fbea4738d03 in late_string
(obj=obj@entry=0x55ab557d3200, attr=<optimized out>, def=def@entry=0x7fbea475344e "")
at ./lib/common/utils.c:126
#4 0x00007fbea47432d9 in emit_node (job=0x55ab557b3d20, n=0x55ab557d3200) at ./lib/common/emit.c:1979
#5 0x00007fbea474894e in emit_view (job=0x55ab557b3d20, g=<optimized out>, flags=12693824)
at ./lib/common/emit.c:3441
#6 emit_page (job=0x55ab557b3d20, g=<optimized out>) at ./lib/common/emit.c:3540
#7 emit_graph (job=<optimized out>, g=<optimized out>) at ./lib/common/emit.c:3597
#8 0x00007fbea474a1b7 in gvRenderJobs (gvc=0x55ab55793760, g=0x55ab557a7250) at ./lib/common/emit.c:4201
#9 0x000055ab3e0b341b in main (argc=<optimized out>, argv=<optimized out>) at ./cmd/dot/dot.c:133
$ tail signature.svg ; echo
<polygon fill="black" stroke="black" points="1913.71,-1434.87 1917.21,-1444.87 1920.71,-1434.87 1913.71,-1434.87"/>
</g>
<!-- 587C5ECA5D0A306C -->
<g id="node3" class="node">
<title>587C5ECA5D0A306C</title>
<ellipse fill="#93576d" stroke="black" cx="1773.31" cy="-1670.19" rx="50.41" ry="26.74"/>
<text text-anchor="middle" x="1773.31" y="-1673.99" font-family="Times,serif" font-size="14.00">Daniel</text>
<text text-anchor="middle" x="1773.31" y="-1658.99" font-family="Times,serif" font-size="14.00">Wagner</text>
</g>
<!-- 0393969D2D760850->5
I didn't try to debug, just providing (hopefully) enough info to let
someone else do that.
Best regards
Uwe