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REJECTED 2026-09-16 — read the summary before the stub below. Everything under this line is the auto-filer's original text, kept as the record of what was reported. Its "Range" section is correct that 7e6029dca4ca cannot be the cause, and wrong to imply the cause is below it: there is no cause in the range at all. The real defect is bug-a-the-exception-chain-fix-is-defeated-by-a-libc-pthread (p70, open).

Track T by default: the FAILING STEP named no owner. Line 1 of 1 is tools/optdiff.sh --shard 9/12. 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 8 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#shard9/12 at 7e6029dca4ca in step 1/1, tools/optdiff.sh --shard 9/12 (auto-filed by twatch)

Repro

tools/testmgr.py --tier opt --job 'optdiff#shard9/12' at 7e6029dca4cadefc2ab87f6b0b4a7252b9a9f194

Range

The named sha 7e6029dca4ca CANNOT be the cause — it touches no buildable file (docs / tickets / tstate only). It is the sha that was TESTED, i.e. the upper bound of an untested range; the cause is somewhere below it.

bad 7e6029dca4ca, last good f02aaea62be9, 12 commit(s) in range — the watcher narrows this by idle bisect; check tstate/TSTATE.md for the current range.

Log tail

Segmentation fault
(tail)
OPT DIFF -O2: test/test_foreign_thread_exception_chain.pas (rc 217 vs 0)
Segmentation fault
OPT DIFF -O3: test/test_foreign_thread_exception_chain.pas (rc 217 vs 139)
optdiff skip EXEC-FAIL-O0: c_abi_struct_byval_main.c(127)
optdiff skip BUILD-FAIL: constinit.pas c_pasunit_ovl_fail.c exception_helper.pas initsec_b.pas library_exports_not_cdecl_fail.pas qualified_a.pas test_a_class_body_alias_does_not_leak_to_the_unit.pas test_a_cross_unit_specialized_method_sees_its_own_parameters.pas test_a_directive_after_the_final_end_reaches_a_used_unit.pas test_an_open_array_parameter_takes_no_default_in_a_free_routine_fail.pas test_an_overload_report_spells_an_array_argument_the_same_at_a_free_call.pas test_asm_arm32.pas test_a_unit_qualified_read_of_a_same_named_global.pas test_case_sensitive_error.pas test_computed_member_fail.pas test_diagnostic_names_the_right_unit.pas test_elfdynsym.pas test_field_access_on_an_operator_result_no_overload_refused.pas test_generic_body_binds_in_its_declaring_unit.pas test_generic_routine_type_parameter_arity.pas test_libmanifest.pas test_pascal_fatal_directive.pas test_setlength_cast_refusal.pas test_sizeof_error.pas test_tobject_root_methods_inside_a_unit.pas test_typed_const_named_undeclared_fail.pas test_typed_const_named_wrongkind_fail.pas ucyctail_a.pas unit_cabi_bridge.pas unit_cabi_intra.pas unit_stray_end.pas
optdiff THREADSAFE-RETRY: test_atomic64.pas test_foreign_thread_exception_chain.pas test_heap_magazine_foreign_thread.pas test_mutex.pas test_threadsafe_class_finalize_kinds.pas test_threadsafe_obj_refcount_atomic.pas test_tthread_sync.pas test_tthread_terminate.pas
optdiff shard 9/12: pass=210 skip=32 diff=1

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