[aasul]

added an FPM regression test for the fatal backtrace cleanup from CVE-2026-109619

the test triggers a fatal error then sends another request to the same FPM worker with an invalid timezone setting. it checks that the previous backtrace doesnt carry over into the next request's warning and that the worker still works normally

tested on PHP 8.5.13-dev NTS debug and it passed. also tested against the pre-fix commit dd830558ffb with ASan and fast shutdown which failed twice with the expected memory error. the same test passed on the patched 31c0ea7d with no sanitizer errors

only added a PHPT test, no changes to the C code

related to GHSA-6wmf-4rv5-p3rp

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🟢 Approval recommended

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[bukka]

I think it's not exactly regression as it wouldn't fail in CI before but the test is good as a smoke test so merging with a bit different commit message.