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sig_term_handled: a process that ends on the stop signal's default action has stopped - #2864
sig_term_handled counted every process whose strace ends in +++ killed by SIG... +++ as "killed instead of stopped" (microservice.cr, the killed list). Its documentation, and its own comment on strace_termination, fail only a process killed with SIGKILL. A process with no handler for SIGTERM ends on the signal's default action: it stopped when asked, promptly, and nothing of it is left.
A vendor's router CNF with systemd as PID 1 (the case behind #2825) failed on exactly that, on a build of main at 09b5221:
hna-6pn2m/hna: judged [14 pids], survivors after 45s: [], killed: ["5984 (powerstat.py, killed with SIGTERM)", "6110 (nc-cli, killed with SIGTERM)"], stopped: [12 pids, "stopped with SIGTERM" / "without a signal in its trace"], container stopped in 7.6 s (exit code 0)
The containers stopped cleanly; two services without a SIGTERM handler failed the test, and with it the CNF's essential score (14 of 18; 15 with this).
Change
StopOutcome.killed?(killed_by): killed only when the signal a process ended on is not one of the termination signals (SIGTERM, SIGINT, SIGQUIT, SIGHUP, SIGUSR1, SIGUSR2). SIGKILL still fails, and so does a crash on the signal (SIGABRT, SIGSEGV), as the OAI 5G core's NFs do.
A process ended by a termination signal's default action is listed as stopped: <pid> stopped by SIGTERM (no handler: its default action).
TERMINATION_SIGNALS moves into StopOutcome, next to the rule; microservice.cr refers to it.
Specs (sig_term shard)
spec/utils/sigterm_outcome_spec.cr: every termination signal, and none, counts as stopped; SIGKILL, SIGABRT and SIGSEGV as killed.
sample-sigterm-default-action: PID 1 forwards SIGTERM to a child with no handler and exits; the child ends on the default action (exit status 143, checked with the fixture's script under Docker). PASSED, with the "stopped by SIGTERM (no handler: its default action)" detail and no "killed instead of stopped".
The existing "PID 1 ignores SIGTERM" spec still expects "killed instead of stopped": the runtime's SIGKILL is still a kill.
Docs
TEST_DOCUMENTATION.md: a crash on the signal fails; a child that ends on the signal's default action has stopped.
…tion has stopped
The test counted every process whose trace ends in "+++ killed by
SIG... +++" as killed instead of stopped, while its documentation and
its own comment fail only one killed with SIGKILL. A process with no
handler for SIGTERM ends on the signal's default action: it stops when
asked, promptly, and nothing of it is left. A vendor's router CNF with
systemd as PID 1 (the #2825 case) failed on exactly that: its containers
stopped in 7.6 s with exit code 0 and no survivors, but two services
without a handler (a python script and a CLI) were reported as "killed
with SIGTERM", and the test failed.
StopOutcome.killed? now counts a process as killed only when the signal
it ended on is not one of the termination signals (SIGTERM, SIGINT,
SIGQUIT, SIGHUP, SIGUSR1, SIGUSR2): SIGKILL still fails, and so does a
crash on the signal (SIGABRT, SIGSEGV). A process ended by a termination
signal's default action is listed as "stopped by SIGTERM (no handler:
its default action)". TERMINATION_SIGNALS moves into StopOutcome, next
to the rule that uses it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Martin Matyas <martin.matyas@tieto.com>
The change centralizes signal outcome classification and updates the SIGTERM verdict to distinguish default-action termination from killed outcomes. It adds a sample deployment, tests for the classification and verdict, and updates the shutdown overview.
Changes: SIGTERM outcome handling
Layer / File(s)
Summary
Signal classification and verdict src/tasks/utils/stop_outcome.cr, src/tasks/workload/microservice.cr, spec/utils/sigterm_outcome_spec.cr
StopOutcome provides a shared termination-signal list and killed? method. The SIGTERM verdict uses this classification to distinguish default-action termination from killed outcomes. Specs cover the signal classifications.
Default-action sample and coverage sample-cnfs/sample-sigterm-default-action/*, spec/workload/microservice_spec.cr, docs/TEST_DOCUMENTATION.md
The sample forwards SIGTERM to a child with no handler and exits successfully. The workload test checks the passing result and stopped-process message. The overview documents shutdown failures and specialized-init handling.
sequenceDiagram
participant TestSuite
participant PID1
participant Child
participant MicroserviceVerdict
TestSuite->>PID1: Begin shutdown with SIGTERM
PID1->>Child: Forward SIGTERM
Child-->>PID1: Terminate through default action
PID1-->>TestSuite: Exit successfully
TestSuite->>MicroserviceVerdict: Evaluate traced process outcomes
MicroserviceVerdict-->>TestSuite: Report child stopped without a handler
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Possibly related issues
lfn-cnti/testsuite#2549 — This PR changes the sig_term_handled test’s stop classification, but does not implement the issue’s adoption workflow.
Possibly related PRs
lfn-cnti/testsuite#2835 — Both PRs change the sig_term_handled verdict and its spec, including how killed outcomes are reported.
lfn-cnti/testsuite#2860 — This PR extends the same StopOutcome module and specs with the shared termination-signal list and killed? classification.
Suggested reviewers:collivier
Merge Risk: Minimal · up to 55edb
No merge-blocking behavior is established. A crashing-child test would improve confidence in shutdown verdicts.
Architecture risk: Low · up to 55edb
The change affects 4 systems.
Changed systems:sample-cnfs, spec, src, docs
Architecture concerns
No architecture-level concerns identified.
Review details
Systems and components
observed — sample-cnfs (service) was modified; 2 changed files map to changed impact.
observed — spec (service) was modified; 2 changed files map to changed impact.
observed — src (service) was modified; 2 changed files map to changed impact.
observed — docs (service) was modified; 1 changed file maps to changed impact.
Before / after behavior
observed — Modified behavior in docs/TEST_DOCUMENTATION.md: The overview adds SIGABRT and SIGSEGV crashes to the child-process shutdown failures and clarifies that specialized init processes are excluded while their services are judged.
observed — Modified behavior in sample-cnfs/sample-sigterm-default-action/cnti-testsuite.yaml: Adds the test-suite configuration and deployment entry, with comments describing the SIGTERM scenario and expected pass result.
observed — Modified behavior in sample-cnfs/sample-sigterm-default-action/manifests/manifest.yml: Adds the default-action Namespace.
observed — Modified behavior in sample-cnfs/sample-sigterm-default-action/manifests/manifest.yml: Adds a one-replica default-action Deployment with a pod labeled app: default-action and a BusyBox container.
Pre-merge checks: 5
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The title clearly and specifically describes the main change: processes that end through a stop signal's default action are classified as stopped.
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The new fixture exercises only a child that ends on SIGTERM's default action. The PID 1 test exercises runtime SIGKILL with exit code 137. Neither test detects a supervised child that crashes with SIGABRT or SIGSEGV and is incorrectly reported as stopped or passed. Add a focused workload fixture and assert that both crash signals fail sig_term_handled.
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Review comment at @spec/workload/microservice_spec.cr around lines 461 - 476:
Extend the `sig_term_handled` workload coverage with a focused child-process
crash fixture for SIGABRT and SIGSEGV, and assert that each crash causes the
workload to fail rather than be reported as stopped or passed. Keep the existing
SIGTERM default-action test unchanged.
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Why
sig_term_handledcounted every process whose strace ends in+++ killed by SIG... +++as "killed instead of stopped" (microservice.cr, thekilledlist). Its documentation, and its own comment onstrace_termination, fail only a process killed with SIGKILL. A process with no handler for SIGTERM ends on the signal's default action: it stopped when asked, promptly, and nothing of it is left.A vendor's router CNF with systemd as PID 1 (the case behind #2825) failed on exactly that, on a build of
mainat 09b5221:The containers stopped cleanly; two services without a SIGTERM handler failed the test, and with it the CNF's essential score (14 of 18; 15 with this).
Change
StopOutcome.killed?(killed_by): killed only when the signal a process ended on is not one of the termination signals (SIGTERM, SIGINT, SIGQUIT, SIGHUP, SIGUSR1, SIGUSR2). SIGKILL still fails, and so does a crash on the signal (SIGABRT, SIGSEGV), as the OAI 5G core's NFs do.<pid> stopped by SIGTERM (no handler: its default action).TERMINATION_SIGNALSmoves intoStopOutcome, next to the rule;microservice.crrefers to it.Specs (
sig_termshard)spec/utils/sigterm_outcome_spec.cr: every termination signal, and none, counts as stopped; SIGKILL, SIGABRT and SIGSEGV as killed.sample-sigterm-default-action: PID 1 forwards SIGTERM to a child with no handler and exits; the child ends on the default action (exit status 143, checked with the fixture's script under Docker). PASSED, with the "stopped by SIGTERM (no handler: its default action)" detail and no "killed instead of stopped".Docs
TEST_DOCUMENTATION.md: a crash on the signal fails; a child that ends on the signal's default action has stopped.🤖 Generated with Claude Code
Summary by CodeRabbit