src: add --trace-sigterm to print a stack trace on SIGTERM - #64948
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Neither `--report-on-signal` nor a `process.on('SIGTERM')` handler runs
while JavaScript is stuck, which is exactly when a trace is wanted: a
pod whose liveness probe stopped responding gets terminated with
SIGTERM, and there is currently no way to find out where it was stuck.
Print the stack trace from an interrupt instead, like `--trace-sigint`
does. The signal is watched through libuv on a dedicated thread and
event loop rather than through a signal handler of our own, so that it
stays multiplexed with `process.on('SIGTERM')` handlers: applications
that shut down gracefully are the ones most likely to have a handler
installed, and disabling the trace for them would defeat the purpose.
Watching the signal takes its default disposition away, so restore it
and re-raise once the trace has been printed, unless the application
handles SIGTERM itself, in which case libuv has already delivered the
signal to its handler as well.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Fixes: nodejs#56879
Signed-off-by: Orgad Shaneh <orgad.shaneh@audiocodes.com>
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #64948 +/- ##
==========================================
- Coverage 90.28% 90.28% -0.01%
==========================================
Files 760 760
Lines 247137 247192 +55
Branches 46617 46626 +9
==========================================
+ Hits 223122 223169 +47
- Misses 15493 15513 +20
+ Partials 8522 8510 -12
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Neither
--report-on-signalnor aprocess.on('SIGTERM')handler runs while JavaScript is stuck, which is exactly when a trace is wanted: a pod whose liveness probe stopped responding gets terminated with SIGTERM, and there is currently no way to find out where it was stuck.Print the stack trace from an interrupt instead, like
--trace-sigintdoes. The signal is watched through libuv on a dedicated thread and event loop rather than through a signal handler of our own, so that it stays multiplexed withprocess.on('SIGTERM')handlers: applications that shut down gracefully are the ones most likely to have a handler installed, and disabling the trace for them would defeat the purpose.Watching the signal takes its default disposition away, so restore it and re-raise once the trace has been printed, unless the application handles SIGTERM itself, in which case libuv has already delivered the signal to its handler as well.
Fixes: #56879