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Sylpheed RE agent 24c1c940e6 tools+docs: the title's loader thread is created and never runs ...

Two findings, the second only visible because of the first.

1. The harness has always had kernel logging switched off. log_mask DISABLES
   categories (Kernel=1, Apu=2, Cpu=4, Gpu=8), so the long-standing --log_mask=13
   meant Kernel+Cpu+Gpu off; kernel calls also log at Debug while log_level
   defaults to Info. Seeing one needs BOTH LOG_MASK=12 and LOG_LEVEL=3, and no
   boot log this project has taken ever contained a kernel call. boot_menu.sh now
   takes LOG_MASK / LOG_LEVEL / EXTRA_FLAGS. A whole boot at Debug with Kernel on
   is 23 MB, so the default was costing far more than it saved.

2. With that on, a captured failure shows the (A) handler doing everything right:

     XamUserGetXUID(0, 7, ...)
     NtCreateEvent(...)
     ExCreateThread(..., entry=821748F0, ..., 00000001)
     ExCreateThread Active: Thread Initially Suspended,
     XThreadF80000CC (1F) Stack: 70880000-70900000
     NtResumeThread(F80000CC, ...)

   and the thread then never executing. Measured two independent ways: it makes
   ZERO kernel calls - it appears 13 times in the log and every one is as an
   ARGUMENT, never as the calling thread, while five other threads make 31905
   calls after the resume - and its host thread has 00:00:00 CPU time while the
   process sits at 546% and has burned 37 minutes of CPU in 6:46 wall.

   A spinning thread burns CPU. This one has not run at all.

So the chain is: press delivered -> handler runs -> thread created suspended ->
resumed -> never scheduled. Input, the cache-flush crash and the game's own logic
are all excluded. A lost resume is a race, which is the first explanation that
fits the ~1-in-3 success rate.

Not settled: where the resume is lost, and no successful boot has been captured
with kernel logging to compare against.

2026-08-19 10:19:06 +00:00

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