Bug #17408: Fiber.backtrace returns [] when unavailable, unlike Thread

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN

[zverok (Victor Shepelev)]

t = Thread.new{}
p t.backtrace
# => nil

f = Fiber.new{}
p f.backtrace
# => []

It seems inconsistent, is this intentional?

Ping @ioquatix (Samuel Williams)

[marcandre (Marc-Andre Lafortune)]

Good catch.

@ioquatix (Samuel Williams) confirms it should be nil and is looking into it.

I'll update the doc.

• Status changed from Open to Closed

Applied in changeset git|d0050edb84e9c3ba99946e08325e168deb741e28.

---

Update Fiber#backtrace doc [See bug #17408]

[ioquatix (Samuel Williams)]

should be nil

when the fiber is dead.

[marcandre (Marc-Andre Lafortune)]

ioquatix (Samuel Williams) wrote in #note-3:

should be nil

when the fiber is dead.

Right. Doc does call resume but not this issue. Correct code should read:

f = Fiber.new{}
f.resume
f.backtrace # => currently [] (should be nil)