fabi/Sylpheed
1
0
Fork 0
Code Issues 9 Pull Requests Actions Packages Projects Releases Wiki Activity

docs: the freeze was caught and the stuck-wait probe reports nothing new

Browse Source 
The fourth run froze 9 seconds into the watcher's window, in flight, and the
probe built for that moment showed the healthy-run baseline and nothing else: one
pair, the same poller on the same object VA as every healthy run, only the thread
handle differing. No new (thread, object) pair appeared.

So the hypothesis the probe was built to catch is refuted - the freeze is not a
guest thread looping on KeWaitForSingleObject timeouts against ONE object - while
the CPU signature is unchanged from the gdb run: 1255 ticks over 10 s, 401 in the
TimerQueue thread and 292/280 in two guest threads.

What survives is stated as two specific blind spots of the instrument rather than
a shrug: the waits may cycle over DIFFERENT objects, which resets the streak and
makes them invisible to a same-object counter; or they may SUCCEED rather than
time out, which leaves a timeout counter nothing to count and would fit the
kernel-log evidence of a self-suspending worker cycling thousands of times
successfully.

Next is a v2 that counts calls per thread per second regardless of object or
result. The freeze lottery paid out on the first attempt this time.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE
This commit is contained in:
Sylpheed RE agent
2026-08-24 07:40:09 +00:00
parent 54b99f9d67
commit 6f55c38bd2
2 changed files with 76 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
docs/re/captures/stage02-freeze-stuck-wait-probe.txt Normal file
View File

@@ -0,0 +1,29 @@
FROZEN IN FLIGHT at 9s
=== stuck-wait probe: (thread, object) pairs ===
25 thread F8000048 on object BE56BB5C (type 2)
=== last 12 probe lines ===
w> F8000048 [wait-probe] thread F8000048 has timed out 6500 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 7000 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 7500 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 8000 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 8500 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 9000 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 9500 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 10000 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 10500 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 100 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 100 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
w> F8000048 [wait-probe] thread F8000048 has timed out 500 times in a row on object BE56BB5C (type 2), timeout=18446744073709251616
=== CPU over 10 s while FROZEN (ticks, state, tid, comm) ===
401 R 154342 xenia_canary
292 S 154409 XThreadA91FF6C0
280 S 154410 XThreadA81FE6C0
60 S 154406 XThreadB1FFC6C0
58 R 154405 XThreadB3FFF6C0
48 S 154376 XMA Decoder (01
33 S 154344 Logging Writer
18 S 154418 XThreadA59FB6C0
total 1255 over 79 threads