No description
53a8d0bea2
When the kiosk child exits, calling process::exit() directly from the calloop
callback runs libc's atexit handlers (Mesa's util_queue_kill_threads) while a
KMS surface thread may still be mid-frame in eglCreateSync(). Concurrent Mesa
teardown and live EGL use corrupt the heap and glibc aborts the process
("free(): corrupted unsorted chunks", SIGABRT).
Stop the event loop cleanly via should_stop instead, stashing the child's exit
code in Common::kiosk_exit_code. After the loop returns, pause() each DRM device
(releasing master so the surface drop path skips its blocking clear_state(), and
the incoming compositor gets master immediately), then drop_and_join() every
surface so no thread is left in Mesa. Only then is process::exit() called, at
which point atexit is safe to run.
The join is done here rather than in Surface::Drop because an unconditional join
in Drop deadlocks against apply_config_for_outputs during normal operation; once
the event loop has stopped, the surface thread can process ThreadCommand::End
and exit without the main thread servicing any pending message.
https://github.com/pop-os/cosmic-comp/issues/2375
Authored by Claude Opus 4.8
Reviewed by Timo Strunk <Timo.Strunk@gmail.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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