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FABRIC.md: item 4.5d Finding 4 -- deep-traced, not yet root-caused

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Computed the loader's true runtime relocation delta to correctly correlate
fault addresses (the running image is starkernel_loader.efi, a relocated
PE, not the separately-linked starkernel_kernel.elf assumed at first).
Fault RIP decodes to log_message()'s entry -- coincidental, not causal,
since it's called on nearly every HADES dispatch during word registration.

Used QEMU's monitor for -d exec,int tracing. Late-start tracing (stop right
before the danger zone to keep trace size down) failed twice -- the window
between a detectable checkpoint and the crash is shorter than host-side
reaction latency. Fell back to full-boot tracing from -S (~2.7GB per
attempt, not committed). That trace shows an unremarkable, normal-looking
repeating three-block loop immediately before the fault, then "Servicing
hardware INT=0x20" (APIC_TIMER_VECTOR) with IDT already showing limit=0 at
that instant.

Ruled out a second illegitimate lidt call (only one call site exists
anywhere, one-time M4 boot setup; searched the trace for any later
execution of that address range and found none). Not yet established: the
actual corrupting write. Documented two remaining explanations (earlier
silent corruption vs. a genuine TCG artifact) and that pinpointing the
exact instruction needs GDB-level single-stepping, a bigger tooling step
than attempted this session.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
2026-08-11 12:40:30 -04:00
co-authored by Claude Sonnet 5
parent 1c5e926c3f
commit 065ab50240
6 changed files with 18345 additions and 38 deletions
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experiments/bare_metal/latest/amd64.csv
+36 -36
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@@ -72,39 +72,39 @@ tick_number,elapsed_ns,tick_interval_ns,cache_hits_delta,bucket_hits_delta,word_
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1 tick_number elapsed_ns tick_interval_ns cache_hits_delta bucket_hits_delta word_executions_delta hot_word_count avg_word_heat_q48 window_width actual_window_size predicted_label_hits jitter_bits apic_ticks time_trust_q48 variance_q48 vm_call_depth_max hera_heat_q48 hermes_heat_q48 artemis_heat_q48
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73 72 720000 10000 0 0 130 24 27 4096 1757 0 0 0 65536 0 0 65536 0 0
74 73 730000 10000 0 0 134 26 21 4096 1757 0 0 0 65536 0 0 65536 0 0
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76 2 20000 10000 0 0 78 10 7 4096 0 0 0 13 15 65536 0 0 65536 0 0
77 3 30000 10000 0 0 101 13 7 4096 0 0 0 15 16 65536 0 0 65536 0 0
78 4 40000 10000 0 0 63 19 8 4096 0 0 0 16 17 65536 0 0 65536 0 0
79 5 50000 10000 0 0 92 25 8 4096 2 0 0 18 20 65536 0 0 65536 0 0
80 6 60000 10000 0 0 64 27 8 4096 2 0 0 19 21 65536 0 0 65536 0 0
81 7 70000 10000 0 0 228 32 8 4096 210 0 0 25 27 65536 0 0 65536 0 0
82 8 80000 10000 0 0 256 34 9 4096 466 0 0 32 34 65536 0 0 65536 0 0
83 9 90000 10000 0 0 256 36 10 4096 722 0 0 38 40 65536 0 0 65536 0 0
84 10 100000 10000 0 0 256 36 11 4096 978 0 0 44 46 65536 0 0 65536 0 0
85 11 110000 10000 0 0 256 36 11 4096 1234 0 0 50 53 65536 0 0 65536 0 0
86 12 120000 10000 0 0 256 36 12 4096 1490 0 0 56 59 65536 0 0 65536 0 0
87 13 130000 10000 0 0 256 37 12 4096 1746 0 0 63 65 65536 0 0 65536 0 0
88 14 140000 10000 0 0 230 39 12 4096 1949 0 0 69 71 65536 0 0 65536 0 0
89 15 150000 10000 0 0 256 39 13 4096 2204 0 0 75 78 65536 0 0 65536 0 0
90 16 160000 10000 0 0 256 39 14 4096 2459 0 0 81 84 65536 0 0 65536 0 0
91 17 170000 10000 0 0 256 39 15 4096 2713 0 0 88 91 65536 0 0 65536 0 0
92 18 180000 10000 0 0 256 39 15 4096 2969 0 0 94 97 65536 0 0 65536 0 0
93 19 190000 10000 0 0 256 39 16 4096 3224 0 0 100 104 65536 0 1 65536 0 0
94 20 200000 10000 0 0 256 41 17 4096 3480 0 0 107 111 65536 0 1 65536 0 0
95 21 210000 10000 0 0 256 41 17 4096 3736 0 0 113 117 65536 0 1 65536 0 0
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97 23 230000 10000 0 0 256 41 19 4096 4096 0 0 128 133 65536 0 1 65536 0 0
98 24 240000 10000 0 0 256 41 20 4096 4096 0 0 134 140 65536 0 1 65536 0 0
99 25 250000 10000 0 0 256 43 20 2048 2048 0 0 141 146 65536 0 1 65536 0 0
100 26 260000 10000 0 0 256 45 21 2048 2048 0 0 147 152 65536 0 1 65536 0 0
101 27 270000 10000 0 0 256 45 22 1024 1024 0 0 153 159 65536 0 1 65536 0 0
102 28 280000 10000 0 0 256 45 23 1024 1024 0 0 160 165 65536 0 1 65536 0 0
103 29 290000 10000 0 0 256 45 24 512 512 0 0 166 171 65536 0 1 65536 0 0
104 30 300000 10000 0 0 256 45 24 512 512 0 0 173 178 65536 0 1 65536 0 0
105 31 310000 10000 0 0 256 45 25 256 256 0 0 179 184 65536 0 1 65536 0 0
106 32 320000 10000 0 0 255 45 26 256 256 0 0 185 190 65536 0 1 65536 0 0
107 33 330000 10000 0 0 256 45 27 256 256 0 0 192 197 65536 0 1 65536 0 0
108 34 340000 10000 0 0 256 45 27 256 256 0 0 198 203 65536 0 1 65536 0 0
109 35 350000 10000 0 0 256 45 28 256 256 0 0 204 209 65536 0 1 65536 0 0
110 36 360000 10000 0 0 256 45 29 256 256 0 0 210 215 65536 0 1 65536 0 0