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[97.122.117.2]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7f440025ae0sm8295425a34.14.2026.08.21.11.18.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Aug 2026 11:18:06 -0700 (PDT) From: Tom Tromey To: Eli Zaretskii Cc: Tom Tromey , gdb-patches@sourceware.org Subject: Re: [PATCH] Ignore the last EXIT_THREAD_DEBUG_EVENT on Windows In-Reply-To: <86mrufz7g0.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 21 Aug 2026 20:53:19 +0300") References: <20260821161828.1836622-1-tromey@adacore.com> <86mrufz7g0.fsf@gnu.org> X-Attribution: Tom Date: Fri, 21 Aug 2026 12:18:05 -0600 Message-ID: <87o6evpcbm.fsf@tromey.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org >>>>> "Eli" == Eli Zaretskii writes: Eli> How can we know that a given thread is a "final" one, when Windows is Eli> known to start its own threads for the program being debugged? We track when threads are created and destroyed, and only apply this behavior when there is a single thread remaining. Eli> Are you sure there are no such threads left running after all the Eli> threads known to GDB exit, and cause this issue? Yes, extracted from the log in the bug, here are all the thread and process events: [windows events] get_windows_debug_event: kernel event for pid=1604 tid=0x89c code=CREATE_PROCESS_DEBUG_EVENT [windows events] get_windows_debug_event: kernel event for pid=1604 tid=0xc20 code=CREATE_THREAD_DEBUG_EVENT [windows events] get_windows_debug_event: kernel event for pid=1604 tid=0xc20 code=EXIT_THREAD_DEBUG_EVENT [windows events] get_windows_debug_event: kernel event for pid=1604 tid=0x89c code=EXIT_THREAD_DEBUG_EVENT >> 1. It only happened under load, I was never able to reproduce it by >> running a single test case. Eli> What do you mean by "load" in this case? what kind of load? If I run one test case in isolation, it never fails. However if I run the whole test suite, which defaults to running as many tests as there are CPUs, I do see some failures. Frequently -- but not always -- the same tests fail. Tom