IO#write deadlock with fiber profiler

[ioquatix]

{"start_time":0.000,"duration":0.013025,"calls":[],"switches":2,"samples":1,"stalls":1}
 3.55s     warn: Async::Task [oid=0x19b8] [ec=0x19c0] [pid=2662] [2025-07-11 09:43:13 +0000]
               | Task may have ended with unhandled exception.
               |   NoMethodError: undefined method 'first' for nil (NoMethodError)
               |   → test/async/task.rb:291 in 'block (5 levels) in <top (required)>'
               |     lib/async/task.rb:201 in 'block in Async::Task#run'
               |     lib/traces/provider/async/task.rb:36 in 'block (2 levels) in schedule'
               |     vendor/bundle/ruby/3.4.0/gems/traces-0.15.2/lib/traces/backend/test.rb:73 in 'Traces::Backend::Test::Interface#trace'
               |     lib/traces/provider/async/task.rb:34 in 'block in schedule'
               |     lib/async/task.rb:439 in 'block in Async::Task#schedule'
bundler: failed to load command: sus (/home/runner/work/async/async/vendor/bundle/ruby/3.4.0/bin/sus)
/home/runner/work/async/async/lib/async/scheduler.rb:369:in 'IO::Event::Selector::URing#io_write': Async::Stop (Async::Stop)
	from /home/runner/work/async/async/lib/async/scheduler.rb:369:in 'Async::Scheduler#io_write'
	from /home/runner/work/async/async/vendor/bundle/ruby/3.4.0/bin/sus:in 'IO#write'
/home/runner/work/async/async/lib/async/scheduler.rb:450:in 'IO#write': deadlock; lock already owned by another fiber belonging to the same thread (ThreadError)
	from /home/runner/work/async/async/lib/async/scheduler.rb:450:in 'IO::Event::Selector::URing#select'
	from /home/runner/work/async/async/lib/async/scheduler.rb:450:in 'Async::Scheduler#run_once!'
	from /home/runner/work/async/async/lib/async/scheduler.rb:489:in 'Async::Scheduler#run_once'
	from /home/runner/work/async/async/lib/async/scheduler.rb:565:in 'block in Async::Scheduler#run'
	from /home/runner/work/async/async/lib/async/scheduler.rb:525:in 'block in Async::Scheduler#run_loop'
	from /home/runner/work/async/async/lib/async/scheduler.rb:522:in 'Thread.handle_interrupt'
	from /home/runner/work/async/async/lib/async/scheduler.rb:522:in 'Async::Scheduler#run_loop'
	from /home/runner/work/async/async/lib/async/scheduler.rb:564:in 'Async::Scheduler#run'
	from test/async/task.rb:278:in 'block (4 levels) in <top (required)>'

https://github.com/socketry/async/actions/runs/16216965704/job/45788492694