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re: the frozen wait-object capture, and screen_id was never a freeze test

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Caught the freeze by waiting for the event (frozen.py + in_flight) instead of
sleeping a guessed interval; freeze_waitobj.sh splits into boot/watch so the
wait is not capped by one Bash call. Verified hard: a frame minutes later is
byte-identical to the capture.

Healthy vs frozen, same run: 20 -> 24 wait frames, XEvent 19 -> 23,
XSemaphore 8 -> 7. The signature is per-thread -- 17 of 24 threads sit on the
exact object they were on, four previously-running threads park, and T74/T75
move off a semaphore onto an event. So the freeze is not a whole-emulator stall.

Also corrects the previous entry's test: screen_id reads 'flight' during a
freeze by design, which is why frozen.py exists. Re-testing the saved frames
says that run was genuinely healthy, but it was right by luck.

heavy_read.py added to test whether the instrument provokes the freeze: I/O is
free (371 MB in 0.1s, page cache), the cost is Python-level CPU. One data point
-- 670s clean, then frozen 54s after the inducer started -- recorded as n=1, not
as causation.
This commit is contained in:
Sylpheed RE agent
2026-08-25 09:02:48 +00:00
parent 93ccff50bb
commit 6900ebe5ca
5 changed files with 285 additions and 43 deletions
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91
docs/re/data/waitobj-s02.txt
View File

@@ -1,4 +1,29 @@
=== healthy: 23 wait frames ===
=== healthy: 20 wait frames ===
T106 Wait n=1 xe::kernel::XEvent
T104 Wait n=1 xe::kernel::XEvent
T97 Wait n=1 xe::kernel::XEvent
T96 Wait n=1 xe::kernel::XEvent
T80 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T79 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T78 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T77 Wait n=1 xe::kernel::XEvent
T76 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XTimer
T75 Wait n=1 xe::kernel::XSemaphore
T74 Wait n=1 xe::kernel::XSemaphore
T71 Wait n=1 xe::kernel::XEvent
T66 Wait n=1 xe::kernel::XEvent
T65 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T64 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T63 Wait n=1 xe::kernel::XSemaphore
T62 Wait n=1 xe::kernel::XEvent
T61 Wait n=1 xe::kernel::XEvent
T50 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XEvent
T36 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XEvent
--- objects waited on:
xe::kernel::XEvent 19
xe::kernel::XSemaphore 8
xe::kernel::XTimer 1
=== frozen: 24 wait frames ===
T106 Wait n=1 xe::kernel::XEvent
T105 Wait n=1 xe::kernel::XEvent
T104 Wait n=1 xe::kernel::XEvent
@@ -9,11 +34,12 @@
T78 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T77 Wait n=1 xe::kernel::XEvent
T76 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XTimer
T75 Wait n=1 xe::kernel::XSemaphore
T74 Wait n=1 xe::kernel::XSemaphore
T75 Wait n=1 xe::kernel::XEvent
T74 Wait n=1 xe::kernel::XEvent
T71 Wait n=1 xe::kernel::XEvent
T69 Wait n=1 xe::kernel::XSemaphore
T68 Wait n=1 xe::kernel::XEvent
T67 Wait n=1 xe::kernel::XEvent
T66 Wait n=1 xe::kernel::XEvent
T65 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T64 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
@@ -23,35 +49,36 @@
T50 Wait n=1 xe::kernel::XEvent
T36 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XEvent
--- objects waited on:
xe::kernel::XEvent 20
xe::kernel::XSemaphore 9
xe::kernel::XTimer 1
=== frozen: 20 wait frames ===
T106 Wait n=1 xe::kernel::XEvent
T104 Wait n=1 xe::kernel::XEvent
T97 Wait n=1 xe::kernel::XEvent
T96 Wait n=1 xe::kernel::XEvent
T80 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T79 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T78 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T77 Wait n=1 xe::kernel::XEvent
T76 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XTimer
T75 Wait n=1 xe::kernel::XSemaphore
T74 Wait n=1 xe::kernel::XSemaphore
T71 Wait n=1 xe::kernel::XEvent
T66 Wait n=1 xe::kernel::XEvent
T65 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T64 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XSemaphore
T63 Wait n=1 xe::kernel::XSemaphore
T62 Wait n=1 xe::kernel::XEvent
T61 Wait n=1 xe::kernel::XEvent
T50 Wait n=1 xe::kernel::XEvent
T36 WaitMultiple n=2 xe::kernel::XEvent, xe::kernel::XEvent
--- objects waited on:
xe::kernel::XEvent 18
xe::kernel::XSemaphore 8
xe::kernel::XEvent 23
xe::kernel::XSemaphore 7
xe::kernel::XTimer 1
=== healthy -> frozen ===
xe::kernel::XEvent 20 -> 18 CHANGED
xe::kernel::XSemaphore 9 -> 8 CHANGED
xe::kernel::XEvent 19 -> 23 CHANGED
xe::kernel::XSemaphore 8 -> 7 CHANGED
xe::kernel::XTimer 1 -> 1
=== per-thread healthy -> frozen ===
thread healthy frozen
T106 Wait(XEvent) Wait(XEvent)
T105 -- Wait(XEvent) <-- CHANGED
T104 Wait(XEvent) Wait(XEvent)
T97 Wait(XEvent) Wait(XEvent)
T96 Wait(XEvent) Wait(XEvent)
T80 WaitMultiple(XEvent,XSemaphore) WaitMultiple(XEvent,XSemaphore)
T79 WaitMultiple(XEvent,XSemaphore) WaitMultiple(XEvent,XSemaphore)
T78 WaitMultiple(XEvent,XSemaphore) WaitMultiple(XEvent,XSemaphore)
T77 Wait(XEvent) Wait(XEvent)
T76 WaitMultiple(XEvent,XTimer) WaitMultiple(XEvent,XTimer)
T75 Wait(XSemaphore) Wait(XEvent) <-- CHANGED
T74 Wait(XSemaphore) Wait(XEvent) <-- CHANGED
T71 Wait(XEvent) Wait(XEvent)
T69 -- Wait(XSemaphore) <-- CHANGED
T68 -- Wait(XEvent) <-- CHANGED
T67 -- Wait(XEvent) <-- CHANGED
T66 Wait(XEvent) Wait(XEvent)
T65 WaitMultiple(XEvent,XSemaphore) WaitMultiple(XEvent,XSemaphore)
T64 WaitMultiple(XEvent,XSemaphore) WaitMultiple(XEvent,XSemaphore)
T63 Wait(XSemaphore) Wait(XSemaphore)
T62 Wait(XEvent) Wait(XEvent)
T61 Wait(XEvent) Wait(XEvent)
T50 WaitMultiple(XEvent,XEvent) Wait(XEvent) <-- CHANGED
T36 WaitMultiple(XEvent,XEvent) WaitMultiple(XEvent,XEvent)