two-cpu-teardown-investigation.json
docs/evidence/two-cpu-teardown-investigation.json
1{
2 "baseSource": "21110c2bb689e3cff00025aaaa7687e8f5f2ecc7",
3 "changes": "Bounded long-task/queue diagnostics and explicit slow-render observer departure assertion.",
4 "command": "CI=1 PLAYWRIGHT_EXECUTABLE_PATH=/tmp/dw-browser-test/chrome-linux/headless_shell taskset -c 0,1 npm run test:browser -- tests/browser/multiplayer.spec.ts --grep \"travelers keep walking|graphics recovery\" --trace on",
5 "stats": {
6 "startTime": "2026-10-25T02:39:24.986Z",
7 "duration": 46376.021,
8 "expected": 1,
9 "skipped": 0,
10 "unexpected": 1,
11 "flaky": 0
12 },
13 "departure": "Slow-render case passed, including the surviving peer observing one traveler after observer context close.",
14 "failure": "Following graphics-recovery case fails before device loss: observer page reports Target crashed.",
15 "traceEvidence": [
16 {
17 "file": "test.trace",
18 "callId": "pw:api@49",
19 "endTime": 42298.904,
20 "message": "Error: page.evaluate: Target crashed "
21 },
22 {
23 "file": "test.trace",
24 "callId": "pw:api@53",
25 "endTime": 42322.997,
26 "message": "Error: locator.dispatchEvent: Target crashed \nCall log:\n - waiting for locator('#export')\n"
27 },
28 {
29 "file": "0-trace.trace",
30 "callId": "call@230",
31 "endTime": 42296.734,
32 "message": "Target crashed "
33 },
34 {
35 "file": "0-trace.trace",
36 "callId": "call@237",
37 "endTime": 42313.319,
38 "message": "Target crashed "
39 }
40 ],
41 "nativeDiagnosis": {
42 "core": "coredumpctl --since \"15 minutes ago\" list /tmp/dw-browser-test/chrome-linux/headless_shell: No coredumps found.",
43 "kernel": "journalctl -k --since \"15 minutes ago\" --grep=\"oom|Out of memory|Killed process|headless|segfault\": no entries.",
44 "memoryAtInspection": {
45 "available": "26 GiB",
46 "swapFree": "110 GiB"
47 },
48 "conclusion": "No native cause established. No system configuration changed; this was an isolated test process."
49 },
50 "nextCapture": "CI enables pw:browser process stderr because a crashed page cannot export its in-page probe.",
51 "passingMovementProbe": {
52 "environment": {
53 "hardwareConcurrency": 2,
54 "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/141.0.7390.37 Safari/537.36"
55 },
56 "longTaskSupported": true,
57 "maxLongTask": 707,
58 "longTasks": [
59 {
60 "start": 2849.5999999940395,
61 "duration": 397
62 },
63 {
64 "start": 3249.699999988079,
65 "duration": 184
66 },
67 {
68 "start": 4109.9000000059605,
69 "duration": 398
70 },
71 {
72 "start": 4509.5,
73 "duration": 146
74 },
75 {
76 "start": 5361.199999988079,
77 "duration": 383
78 },
79 {
80 "start": 5746.699999988079,
81 "duration": 75
82 },
83 {
84 "start": 6294.199999988079,
85 "duration": 226
86 },
87 {
88 "start": 6522.299999982119,
89 "duration": 63
90 },
91 {
92 "start": 7552.0999999940395,
93 "duration": 707
94 },
95 {
96 "start": 8259.699999988079,
97 "duration": 439
98 },
99 {
100 "start": 8719.299999982119,
101 "duration": 162
102 },
103 {
104 "start": 9061.799999982119,
105 "duration": 96
106 },
107 {
108 "start": 10271,
109 "duration": 102
110 },
111 {
112 "start": 11611.40000000596,
113 "duration": 174
114 },
115 {
116 "start": 12681.299999982119,
117 "duration": 205
118 }
119 ],
120 "queue": [
121 {
122 "at": 321.69999998807907,
123 "kind": "complete",
124 "queue": 1,
125 "start": 321.40000000596046,
126 "wait": 0.29999998211860657
127 },
128 {
129 "at": 675.5999999940395,
130 "kind": "complete",
131 "queue": 1,
132 "start": 675,
133 "wait": 0.5999999940395355
134 },
135 {
136 "at": 1316.0999999940395,
137 "kind": "submit",
138 "queue": 1,
139 "start": 1315,
140 "duration": 1.0999999940395355
141 },
142 {
143 "at": 1904,
144 "kind": "complete",
145 "queue": 1,
146 "start": 1316.0999999940395,
147 "wait": 587.9000000059605
148 },
149 {
150 "at": 1908.2999999821186,
151 "kind": "submit",
152 "queue": 1,
153 "start": 1907,
154 "duration": 1.2999999821186066
155 },
156 {
157 "at": 2828,
158 "kind": "complete",
159 "queue": 1,
160 "start": 1908.4000000059605,
161 "wait": 919.5999999940395
162 },
163 {
164 "at": 3085.9000000059605,
165 "kind": "submit",
166 "queue": 1,
167 "start": 3085.9000000059605,
168 "duration": 0
169 },
170 {
171 "at": 4104.5,
172 "kind": "complete",
173 "queue": 1,
174 "start": 3085.9000000059605,
175 "wait": 1018.5999999940395
176 },
177 {
178 "at": 4286.9000000059605,
179 "kind": "submit",
180 "queue": 1,
181 "start": 4285.9000000059605,
182 "duration": 1
183 },
184 {
185 "at": 5361.0999999940395,
186 "kind": "complete",
187 "queue": 1,
188 "start": 4286.9000000059605,
189 "wait": 1074.199999988079
190 },
191 {
192 "at": 5440.699999988079,
193 "kind": "submit",
194 "queue": 1,
195 "start": 5440.5999999940395,
196 "duration": 0.09999999403953552
197 },
198 {
199 "at": 6293.4000000059605,
200 "kind": "complete",
201 "queue": 1,
202 "start": 5440.699999988079,
203 "wait": 852.7000000178814
204 },
205 {
206 "at": 6421.199999988079,
207 "kind": "submit",
208 "queue": 1,
209 "start": 6421.199999988079,
210 "duration": 0
211 },
212 {
213 "at": 8259.59999999404,
214 "kind": "complete",
215 "queue": 1,
216 "start": 6421.199999988079,
217 "wait": 1838.4000000059605
218 },
219 {
220 "at": 8466.299999982119,
221 "kind": "submit",
222 "queue": 1,
223 "start": 8466.299999982119,
224 "duration": 0
225 },
226 {
227 "at": 10253,
228 "kind": "complete",
229 "queue": 1,
230 "start": 8466.299999982119,
231 "wait": 1786.7000000178814
232 },
233 {
234 "at": 10324.299999982119,
235 "kind": "submit",
236 "queue": 1,
237 "start": 10322.09999999404,
238 "duration": 2.199999988079071
239 },
240 {
241 "at": 11607.40000000596,
242 "kind": "complete",
243 "queue": 1,
244 "start": 10324.299999982119,
245 "wait": 1283.1000000238419
246 },
247 {
248 "at": 12841.799999982119,
249 "kind": "submit",
250 "queue": 1,
251 "start": 12841.799999982119,
252 "duration": 0
253 }
254 ],
255 "maxFrameGap": 1517.5,
256 "maxWorkerGap": 730.0999999940395,
257 "maxTimerGap": 1190.5999999940395,
258 "graphics": [
259 {
260 "at": 156,
261 "kind": "device-request",
262 "adapter": {
263 "vendor": "google",
264 "architecture": "swiftshader",
265 "device": "",
266 "description": ""
267 }
268 },
269 {
270 "at": 163.09999999403954,
271 "kind": "device-ready"
272 }
273 ]
274 }
275}
276