Public bug reported:
The ghostty package (1.3.0~us1-0ubuntu1) in Ubuntu 26.04 crashes
immediately upon launch on processors lacking x86-64-v3 (AVX/AVX2)
support.
Probable Root Cause: The package maintainer omitted the baseline CPU
target configuration during the build process. As a result, the upstream
Zig compiler defaulted to host-native optimizations on Ubuntu's build
servers, illegally baking modern vector instructions into the generic
amd64 binary.
GDB Proof: A core dump inspection reveals the crash occurs at an AVX-specific
instruction:
=> 0x636e91ef8daa: vmovups 0xb0(%rsp),%ymm0
Also:
$ objdump -d /usr/bin/ghostty | grep -E "vmovups|vpbroadcast|vpxor" | wc -l
37994
Suggested Fix: Update the Ubuntu package build recipe to explicitly pass
the baseline CPU flag to the compiler: zig build -Doptimize=ReleaseFast
-Dcpu=baseline
Additional info:
$ apt list ghostty
ghostty/resolute,now 1.3.0~us1-0ubuntu1 amd64 [installed]
$ readelf -n /usr/bin/ghostty
Displaying notes found in: .note.ABI-tag
Owner Data size Description
GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)
OS: Linux, ABI: 3.2.0
Displaying notes found in: .note.package
Owner Data size Description
FDO 0x00000064 FDO_PACKAGING_METADATA
Packaging Metadata:
{"type":"deb","os":"ubuntu","name":"ghostty","version":"1.3.0~us1-0ubuntu1","architecture":"amd64"}
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: ghostty 1.3.0~us1-0ubuntu1
ProcVersionSignature: Ubuntu 7.0.0-28.28-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Tue Aug 4 19:33:12 2026
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: ghostty
UpgradeStatus: Upgraded to resolute on 2026-04-18 (108 days ago)
** Affects: ghostty (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2162854
Title:
ghostty package crashes with Illegal instruction (core dumped) on
standard x86-64 CPUs
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