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Track T by default: the FAILING STEP named no owner. Line 1 of 1 is tools/optdiff.sh --shard 2/12. The job's own src (tools/optdiff.sh, 1 file(s)) is NOT used here on purpose: it is what the job compiles, not what broke, and guessing a lane from it is what sent three reds in one job to the wrong lane. This is a FALLBACK, not a finding — nothing says the defect is Track T's. Re-lane it before working it.

origin/master has advanced 6 commit(s) since this sha. Re-verify at current HEAD before acting — the callback is tagged to the sha that was tested, which may no longer be the state of the tree.

regression: optdiff#shard2/12 at 285208414d3f in step 1/1, tools/optdiff.sh --shard 2/12 (auto-filed by twatch)

Repro

tools/testmgr.py --tier opt --job 'optdiff#shard2/12' at 285208414d3f332c0b13f2a084e671fbad114be7

Range

bad unknown, range unknown — there is no earlier passing sha to bound it, or the bound is not recorded. No idle bisect will happen; this one needs hand-triage.

Log tail

OPT DIFF -O1: test/c_crtl_glob_no_leak.c (rc 2 vs 2)
OPT DIFF -O2: test/c_crtl_glob_no_leak.c (rc 2 vs 2)
OPT DIFF -O3: test/c_crtl_glob_no_leak.c (rc 2 vs 2)
optdiff skip SKIPLIST: test_thread_writeln_interleave.pas
optdiff skip TIMEOUT-O0: test_target_name_in_external_refusal.pas
optdiff skip BUILD-FAIL: aoc_ovl_unit_fmt.pas c_cpp_macro_arg_shapes.c c_pasunit_two_overloads_fail.c cabi_bridge.c cabi_intra.c csqlite_layout_probe.c cxtensa_obj.c isas_b325_base.pas lib_klondike.pas library_exports_unknown_name_fail.pas test_a_class_name_is_not_an_integer_constant_fail.pas test_a_forward_pointer_two_units_deep_still_resolves.pas test_a_procedural_type_without_a_default_still_refuses_a_short_call_fail.pas test_a_units_define_and_packing_do_not_reach_the_units_it_uses.pas test_array_range_too_large_fail.pas test_char_array_3d_row_not_a_string_fail.pas test_incdiag_main_fail.pas test_mode_delphi_unit_leak_off_fail.pas test_one_char_literal_not_a_typed_pointer_fails.pas test_ordinal_default_on_string_param_fail.pas test_pascal_define_unit_scope_order1.pas test_record_protected_fail.pas test_set_literal_wrong_enum_fail.pas test_unit_ambient_system_surface.pas uopcircb.pas
optdiff THREADSAFE-RETRY: lib_criticalsection_blocking.pas test_critsec_once.pas test_parallel_for_capture_scalar_types.pas test_signal_threads.pas test_thread_clone.pas test_threadsafe_refcount_lockfree.pas test_tthread_final.pas
optdiff shard 2/12: pass=200 skip=27 diff=1

Stub ticket: signal only. Track T agent (face 2) enriches or a dev track takes it from the repro line.

Resolution (2026-09-16, frankb-56, Track C)

NOT A COMPILER DEFECT. The harness manufactured the difference, and the difference was argv[0]. optdiff built the four levels to four different paths and compared stdout+stderr. test/c_crtl_glob_no_leak.c requires an argument, optdiff supplies none, so it exits 2 on its usage line — and that line prints argv[0]. The entire diff was the binary's own path:

-usage: /tmp/optdiff.N/d0 ...
+usage: /tmp/optdiff.N/d1 ...

rc 2 vs 2 was the tell and it was in the ticket from the start: matching exit codes on both sides mean the program ran to completion and disagreed only on text. Fixed in tools/optdiff.sh by building every level to ONE path.

THE COMPILER WAS NEVER IMPLICATED, AND I MEASURED THAT RATHER THAN INFERRING IT. Run properly with its argument at each level, c_crtl_glob_no_leak.c is byte-identical across -O0/-O1/-O2/-O3 — an allocs-vs-frees census. This is the first time this program has actually been swept at four O levels, because under optdiff it only ever reached the usage path.

RESIDUAL, AND IT IS NOT CLOSED BY THIS FIX — owner: Track T. optdiff cannot supply arguments, so any argument-taking program in the corpus is swept only on its usage path and counts as a pass. After this fix these two pass honestly (all four levels agree) while covering nothing, which is a guard that cannot fail sitting inside the pass count. Sizing that population needs a full-corpus run, which this seat's gate does not include.