Bug #22191: `Signal.trap(:EXIT)` exception only shown if `at_exit` also raises

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 4.1.0dev (2026-05-29T14:34:40Z master 7a07a54298) +PRISM [x86_64-linux]
• Backport: 3.3: REQUIRED, 3.4: REQUIRED, 4.0: DONE

[Earlopain (Earlopain _)]

Signal.trap(:EXIT, proc { raise "foo" })
# No output

Signal.trap(:EXIT, proc { raise "foo" })
at_exit { raise "bar" }
# test.rb:2:in 'block in <main>': bar (RuntimeError)
# test.rb:1:in 'block in <main>': foo (RuntimeError)

A bit weird

[nobu (Nobuyoshi Nakada)]

• Backport changed from 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN to 3.3: REQUIRED, 3.4: REQUIRED, 4.0: REQUIRED

[nobu (Nobuyoshi Nakada)]

Related bug: when two END raise exceptions, the same message is printed multiple times.

$ ruby -e 'END{raise "END1"};END{raise "END2"}'
-e:1:in 'block (2 levels) in <main>': END2 (RuntimeError)
-e:1:in 'block (2 levels) in <main>': END1 (RuntimeError)
-e:1:in 'block (2 levels) in <main>': END2 (RuntimeError)

$ ruby -e 'END{raise "END1"};END{raise "END2"};END{raise "END3"}'
-e:1:in 'block (2 levels) in <main>': END3 (RuntimeError)
-e:1:in 'block (2 levels) in <main>': END2 (RuntimeError)
-e:1:in 'block (2 levels) in <main>': END3 (RuntimeError)
-e:1:in 'block (2 levels) in <main>': END1 (RuntimeError)
-e:1:in 'block (2 levels) in <main>': END2 (RuntimeError)
-e:1:in 'block (2 levels) in <main>': END3 (RuntimeError)

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset git|0d7e50a1746bfa3db2a50478d3680cd7c36ea383.

---

[Bug #22191] Report EXIT handler exceptions after END blocks

Keep exceptions raised by EXIT traps until END handlers finish.
That leaves them available for reporting during cleanup.

Print END handler exceptions without replaying causes already
reported from earlier exit handlers. This keeps the previous handler
exception visible while avoiding duplicate diagnostics.

[k0kubun (Takashi Kokubun)]

• Backport changed from 3.3: REQUIRED, 3.4: REQUIRED, 4.0: REQUIRED to 3.3: REQUIRED, 3.4: REQUIRED, 4.0: DONE

ruby_4_0 42c09041fe98a932d5a2a14da861527d2d80b807 merged revision(s) 0d7e50a1746bfa3db2a50478d3680cd7c36ea383.