OmarchybotandDavid Heinemeier Hansson
b68d4142d7
The section had grown a paragraph per review round, each one explaining why the last was right, until one offer took a third of the file. Most of it was reassurance about what the command refuses rather than anything an agent has to do, and the command enforces that itself whatever the prose says. What is left is the instruction: offer it and never run it unprompted, say how to lift it, which of the two names to pass and why the binary is the better one, quote it because the name is the crashed program's to choose, and name the interpreter collision before muting python or node on someone's behalf. Fifty-four lines to thirty-two, with nothing dropped that changes what the agent does.
5.6 KiB
name, description
| name | description |
|---|---|
| diagnose-crash | Diagnose why a program crashed on this machine, from a systemd-coredump core dump. Use when a process has segfaulted, aborted, or otherwise dumped core, when asked why an application crashed or disappeared, or when a "Process crashed:" desktop notification is acted on. Triggers: crash, segfault, SIGSEGV, SIGABRT, core dump, coredumpctl, "why did X crash", "X keeps crashing", backtrace symbolization. Covers reporting a confirmed Omarchy bug upstream — see reporting.md. |
Diagnosing a Crash
Work from evidence. The goal is an honest account of what happened, not a plausible-sounding story.
Establish the facts
coredumpctl info <pid> is the starting point. Beyond the backtrace, note the
command line the process was started with — it usually reveals what the
program was working on when it died, which is often the whole answer.
coredumpctl list shows whether this crash is a one-off or a pattern. Repeated
crashes of the same program, or several programs dying together, point somewhere
different than a single failure does.
Rule out the boring causes first
Check resource exhaustion before blaming the program: free -h, and the journal
for OOM kills. A process killed by the OOM killer is not a bug in that process.
Correlate against the timeline
The crash timestamp is the most underused piece of evidence. Compare it against:
- Filesystem mtimes. A directory or file whose mtime lands on the same second as the crash strongly suggests what triggered it.
- The journal around that moment, for related warnings from the same or neighbouring processes.
- Recent package updates. A crash that starts right after an update points at the update.
Read the whole core, not just frame 0
Thread stacks other than the crashing one show what work was in flight — thumbnailers, image loaders, IPC readers, GPU queues. That context often explains the trigger even when the crashing frame itself cannot be symbolized.
Note any third-party code in the address space: file-manager or browser extensions, plugins, out-of-tree drivers. In-process third-party code is a common crash source and worth flagging — but do not pin blame on it without evidence that it is actually implicated.
Symbolize when you can
This is Arch, which runs a public debuginfod server:
core=$(mktemp -t crash-XXXXXX.core)
trap 'rm -f "$core"' EXIT
coredumpctl dump <pid> --output="$core"
DEBUGINFOD_URLS="https://debuginfod.archlinux.org" \
gdb -q <executable> "$core" \
-batch -ex 'set debuginfod enabled on' -ex 'bt'
A core is a verbatim copy of the process's memory and can hold passwords, tokens,
and private documents. Write it to a fresh mktemp path rather than a predictable
shared one, and delete it when you are done — never leave it lying in /tmp.
Many packages publish no debug symbols. When frames stay unresolved, say so — never invent function names to fill the gap. An unsymbolized stack still has shape: which library each frame belongs to, and whether the crash came from a signal handler, a main loop, or a worker thread.
Report
- What crashed, and what it was doing at the time.
- The most likely mechanism — separating clearly what the evidence proves from what you are inferring.
- Whether any user data was lost, and where it can be recovered from. Check the trash before concluding anything is gone.
- Whether it is likely to recur, and what would avoid or fix it.
Be straight about the limits of the evidence. If the cause is genuinely ambiguous, say so rather than assembling confidence out of guesswork.
Leave the system as you found it. Diagnosis reads; it does not fix, tidy, or reconfigure. The one thing to clean up is your own: delete the core you extracted above, which is a copy of the crashed process's memory. The single change a diagnosis may make is the mute below, and only when the user asks for it.
Offer to stop the notifications for this program
A crash you have explained often keeps happening anyway. Finish by offering to silence notifications for that one program, and never run it unprompted. Say how to lift it in the same breath, so it is not a one-way door.
omarchy-crash-mute '<program>' # silence it
omarchy-crash-mute '<program>' off # let it speak again
omarchy-crash-mute # list what is muted
Pass the binary: path from the crash facts, or the process: name where no
binary was recorded; the command reduces either to the name the watcher keys on.
A diagnosis run by hand from omarchy agent crash <pid> has neither, so take
them from coredumpctl info. Prefer the binary: a process name is truncated to
15 characters and a basename is not, so muting the truncated form matches
nothing, forever, while looking like it worked.
Quote it. The name is whatever the crashed program's author called a file, and a single quote inside one closes yours and runs the rest as your shell.
The key is a bare name, so anything run through an interpreter is keyed as the
interpreter: muting python3.13 silences every Python program on the machine.
Say so rather than quietly doing it.
None of this fixes anything, and a mute offered in place of a fix that was within reach is the wrong answer. For every program rather than one, the switch is Trigger > Toggle > Crash Capture.
If it is an Omarchy bug
Most application crashes are upstream bugs in those applications, not Omarchy's
doing. In the minority of cases where the cause really does sit within Omarchy's
sphere of control, read reporting.md before offering to file
anything.