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FABRIC.md: item 4.5d -- fortification and putc/getc fixed, PM Timer stall now blocks

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Finding 2 (putc/getc) fixed via shim.c backfill (previous commit). With
both Finding 1 (-U_FORTIFY_SOURCE) and Finding 2 fixed, amd64 links clean
at -O2 -- rigorously confirmed zero new warnings by diffing normalized
warning text between -O0 and -O2 builds (empty diff, ~3040 pre-existing
warnings in vendored code unchanged).

New Finding 3, not fixed, now blocking: amd64 boot stalls for minutes
inside calibrate_tsc_with_pmtimer() (timer.c:560-589) at -O2 -- a
mainline busy-wait loop reading the ACPI PM Timer via genuinely-volatile
inl() until 1000 real ticks elapse, bounded by a 5M-iteration timeout. A
one-shot diagnostic probe (reverted after capture) caught exactly one
checkpoint in 55 seconds of observation, then nothing -- not yet
root-caused whether this is the 5M-iteration timeout itself taking several
minutes to exhaust under -O2, or a genuine non-terminating condition.

Makefile.starkernel reverted to -O0 again; nothing broken landed in
history. Routine artifacts from this session's boot attempts included.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
2026-08-11 11:14:52 -04:00
co-authored by Claude Sonnet 5
parent 37eec5aaa1
commit 7df2e1bae3
10 changed files with 36722 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files
experiments/bare_metal/latest/amd64.csv
+27 -27
View File
@@ -72,21 +72,21 @@ tick_number,elapsed_ns,tick_interval_ns,cache_hits_delta,bucket_hits_delta,word_
71,710000,10000,0,0,44,22,39,4096,1757,0,0,0,65536,0,0,65536,0,0
72,720000,10000,0,0,130,24,27,4096,1757,0,0,0,65536,0,0,65536,0,0
73,730000,10000,0,0,134,26,21,4096,1757,0,0,0,65536,0,0,65536,0,0
1,10000,18446744073708831616,0,0,117,4,4,4096,0,0,4895412794951728796,12,65536,0,0,65536,0,0
1,10000,18446744073708831616,0,0,117,4,4,4096,0,0,4895412794951728796,13,65536,0,0,65536,0,0
2,20000,10000,0,0,78,10,7,4096,0,0,0,14,65536,0,0,65536,0,0
3,30000,10000,0,0,101,13,7,4096,0,0,0,15,65536,0,0,65536,0,0
4,40000,10000,0,0,63,19,8,4096,0,0,0,16,65536,0,0,65536,0,0
5,50000,10000,0,0,92,25,8,4096,2,0,0,18,65536,0,0,65536,0,0
6,60000,10000,0,0,64,27,8,4096,2,0,0,19,65536,0,0,65536,0,0
7,70000,10000,0,0,228,32,8,4096,210,0,0,26,65536,0,0,65536,0,0
8,80000,10000,0,0,256,34,9,4096,466,0,0,32,65536,0,0,65536,0,0
9,90000,10000,0,0,256,36,10,4096,722,0,0,38,65536,0,0,65536,0,0
10,100000,10000,0,0,256,36,11,4096,978,0,0,45,65536,0,0,65536,0,0
11,110000,10000,0,0,256,36,11,4096,1234,0,0,51,65536,0,0,65536,0,0
12,120000,10000,0,0,256,36,12,4096,1490,0,0,57,65536,0,0,65536,0,0
13,130000,10000,0,0,256,37,12,4096,1746,0,0,63,65536,0,0,65536,0,0
14,140000,10000,0,0,230,39,12,4096,1949,0,0,69,65536,0,0,65536,0,0
15,150000,10000,0,0,256,39,13,4096,2204,0,0,75,65536,0,0,65536,0,0
3,30000,10000,0,0,101,13,7,4096,0,0,0,16,65536,0,0,65536,0,0
4,40000,10000,0,0,63,19,8,4096,0,0,0,17,65536,0,0,65536,0,0
5,50000,10000,0,0,92,25,8,4096,2,0,0,20,65536,0,0,65536,0,0
6,60000,10000,0,0,64,27,8,4096,2,0,0,21,65536,0,0,65536,0,0
7,70000,10000,0,0,228,32,8,4096,210,0,0,27,65536,0,0,65536,0,0
8,80000,10000,0,0,256,34,9,4096,466,0,0,33,65536,0,0,65536,0,0
9,90000,10000,0,0,256,36,10,4096,722,0,0,39,65536,0,0,65536,0,0
10,100000,10000,0,0,256,36,11,4096,978,0,0,46,65536,0,0,65536,0,0
11,110000,10000,0,0,256,36,11,4096,1234,0,0,52,65536,0,0,65536,0,0
12,120000,10000,0,0,256,36,12,4096,1490,0,0,58,65536,0,0,65536,0,0
13,130000,10000,0,0,256,37,12,4096,1746,0,0,64,65536,0,0,65536,0,0
14,140000,10000,0,0,230,39,12,4096,1949,0,0,70,65536,0,0,65536,0,0
15,150000,10000,0,0,256,39,13,4096,2204,0,0,76,65536,0,0,65536,0,0
16,160000,10000,0,0,256,39,14,4096,2459,0,0,82,65536,0,0,65536,0,0
17,170000,10000,0,0,256,39,15,4096,2713,0,0,88,65536,0,0,65536,0,0
18,180000,10000,0,0,256,39,15,4096,2969,0,0,94,65536,0,0,65536,0,0
@@ -95,16 +95,16 @@ tick_number,elapsed_ns,tick_interval_ns,cache_hits_delta,bucket_hits_delta,word_
21,210000,10000,0,0,256,41,17,4096,3736,0,0,113,65536,0,1,65536,0,0
22,220000,10000,0,0,256,41,18,4096,3992,0,0,122,65536,0,1,65536,0,0
23,230000,10000,0,0,256,41,19,4096,4096,0,0,128,65536,0,1,65536,0,0
24,240000,10000,0,0,256,41,20,4096,4096,0,0,135,65536,0,1,65536,0,0
25,250000,10000,0,0,256,43,20,2048,2048,0,0,142,65536,0,1,65536,0,0
26,260000,10000,0,0,256,45,21,2048,2048,0,0,148,65536,0,1,65536,0,0
27,270000,10000,0,0,256,45,22,1024,1024,0,0,154,65536,0,1,65536,0,0
28,280000,10000,0,0,256,45,23,1024,1024,0,0,161,65536,0,1,65536,0,0
29,290000,10000,0,0,256,45,24,512,512,0,0,167,65536,0,1,65536,0,0
30,300000,10000,0,0,256,45,24,512,512,0,0,174,65536,0,1,65536,0,0
31,310000,10000,0,0,256,45,25,256,256,0,0,180,65536,0,1,65536,0,0
32,320000,10000,0,0,255,45,26,256,256,0,0,186,65536,0,1,65536,0,0
33,330000,10000,0,0,256,45,27,256,256,0,0,193,65536,0,1,65536,0,0
34,340000,10000,0,0,256,45,27,256,256,0,0,199,65536,0,1,65536,0,0
35,350000,10000,0,0,256,45,28,256,256,0,0,206,65536,0,1,65536,0,0
36,360000,10000,0,0,256,45,29,256,256,0,0,212,65536,0,1,65536,0,0
24,240000,10000,0,0,256,41,20,4096,4096,0,0,134,65536,0,1,65536,0,0
25,250000,10000,0,0,256,43,20,2048,2048,0,0,140,65536,0,1,65536,0,0
26,260000,10000,0,0,256,45,21,2048,2048,0,0,147,65536,0,1,65536,0,0
27,270000,10000,0,0,256,45,22,1024,1024,0,0,153,65536,0,1,65536,0,0
28,280000,10000,0,0,256,45,23,1024,1024,0,0,159,65536,0,1,65536,0,0
29,290000,10000,0,0,256,45,24,512,512,0,0,166,65536,0,1,65536,0,0
30,300000,10000,0,0,256,45,24,512,512,0,0,172,65536,0,1,65536,0,0
31,310000,10000,0,0,256,45,25,256,256,0,0,178,65536,0,1,65536,0,0
32,320000,10000,0,0,255,45,26,256,256,0,0,185,65536,0,1,65536,0,0
33,330000,10000,0,0,256,45,27,256,256,0,0,191,65536,0,1,65536,0,0
34,340000,10000,0,0,256,45,27,256,256,0,0,197,65536,0,1,65536,0,0
35,350000,10000,0,0,256,45,28,256,256,0,0,203,65536,0,1,65536,0,0
36,360000,10000,0,0,256,45,29,256,256,0,0,209,65536,0,1,65536,0,0
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
72 71 710000 10000 0 0 44 22 39 4096 1757 0 0 0 65536 0 0 65536 0 0
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
75 1 10000 18446744073708831616 0 0 117 4 4 4096 0 0 4895412794951728796 12 13 65536 0 0 65536 0 0
76 2 20000 10000 0 0 78 10 7 4096 0 0 0 14 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 26 27 65536 0 0 65536 0 0
82 8 80000 10000 0 0 256 34 9 4096 466 0 0 32 33 65536 0 0 65536 0 0
83 9 90000 10000 0 0 256 36 10 4096 722 0 0 38 39 65536 0 0 65536 0 0
84 10 100000 10000 0 0 256 36 11 4096 978 0 0 45 46 65536 0 0 65536 0 0
85 11 110000 10000 0 0 256 36 11 4096 1234 0 0 51 52 65536 0 0 65536 0 0
86 12 120000 10000 0 0 256 36 12 4096 1490 0 0 57 58 65536 0 0 65536 0 0
87 13 130000 10000 0 0 256 37 12 4096 1746 0 0 63 64 65536 0 0 65536 0 0
88 14 140000 10000 0 0 230 39 12 4096 1949 0 0 69 70 65536 0 0 65536 0 0
89 15 150000 10000 0 0 256 39 13 4096 2204 0 0 75 76 65536 0 0 65536 0 0
90 16 160000 10000 0 0 256 39 14 4096 2459 0 0 82 65536 0 0 65536 0 0
91 17 170000 10000 0 0 256 39 15 4096 2713 0 0 88 65536 0 0 65536 0 0
92 18 180000 10000 0 0 256 39 15 4096 2969 0 0 94 65536 0 0 65536 0 0
95 21 210000 10000 0 0 256 41 17 4096 3736 0 0 113 65536 0 1 65536 0 0
96 22 220000 10000 0 0 256 41 18 4096 3992 0 0 122 65536 0 1 65536 0 0
97 23 230000 10000 0 0 256 41 19 4096 4096 0 0 128 65536 0 1 65536 0 0
98 24 240000 10000 0 0 256 41 20 4096 4096 0 0 135 134 65536 0 1 65536 0 0
99 25 250000 10000 0 0 256 43 20 2048 2048 0 0 142 140 65536 0 1 65536 0 0
100 26 260000 10000 0 0 256 45 21 2048 2048 0 0 148 147 65536 0 1 65536 0 0
101 27 270000 10000 0 0 256 45 22 1024 1024 0 0 154 153 65536 0 1 65536 0 0
102 28 280000 10000 0 0 256 45 23 1024 1024 0 0 161 159 65536 0 1 65536 0 0
103 29 290000 10000 0 0 256 45 24 512 512 0 0 167 166 65536 0 1 65536 0 0
104 30 300000 10000 0 0 256 45 24 512 512 0 0 174 172 65536 0 1 65536 0 0
105 31 310000 10000 0 0 256 45 25 256 256 0 0 180 178 65536 0 1 65536 0 0
106 32 320000 10000 0 0 255 45 26 256 256 0 0 186 185 65536 0 1 65536 0 0
107 33 330000 10000 0 0 256 45 27 256 256 0 0 193 191 65536 0 1 65536 0 0
108 34 340000 10000 0 0 256 45 27 256 256 0 0 199 197 65536 0 1 65536 0 0
109 35 350000 10000 0 0 256 45 28 256 256 0 0 206 203 65536 0 1 65536 0 0
110 36 360000 10000 0 0 256 45 29 256 256 0 0 212 209 65536 0 1 65536 0 0