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Wed, 26 Aug 2026 18:20:55 +0000 Received: from dip164.lsn.ir2.yahoo.com ([87.248.99.173]) by hello (SMTP) with SMTP ID 37d7a214c2d2030473d54f94eb38fda5 for ; Wed, 26 Aug 2026 18:20:54 +0000 (UTC) From: Hannes Domani To: gdb-patches@sourceware.org Subject: [PATCH] Windows gdb: Don't abort get_windows_debug_event with no threads Date: Wed, 26 Aug 2026 20:20:37 +0200 Message-ID: <20260826182037.757713-1-ssbssa@yahoo.de> X-Mailer: git-send-email 2.54.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit References: <20260826182037.757713-1-ssbssa.ref@yahoo.de> 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 When a machine is under heavy load, windows sometimes provides the debug events in a weird order: [windows events] get_windows_debug_event: kernel event for pid=22208 tid=0x6df0 code=CREATE_PROCESS_DEBUG_EVENT [windows events] get_windows_debug_event: kernel event for pid=22208 tid=0xe74 code=CREATE_THREAD_DEBUG_EVENT [windows events] get_windows_debug_event: kernel event for pid=22208 tid=0xe74 code=EXIT_THREAD_DEBUG_EVENT [windows events] get_windows_debug_event: kernel event for pid=22208 tid=0x6df0 code=EXIT_THREAD_DEBUG_EVENT At this point the process has seemingly no threads, even though for the last thread there should be EXIT_PROCESS_DEBUG_EVENT instead of EXIT_THREAD_DEBUG_EVENT. But the next event shows that a new thread was created, which then finally got EXIT_PROCESS_DEBUG_EVENT: [windows events] get_windows_debug_event: kernel event for pid=22208 tid=0x5a7c code=CREATE_THREAD_DEBUG_EVENT [windows events] get_windows_debug_event: kernel event for pid=22208 tid=0x5a7c code=EXIT_PROCESS_DEBUG_EVENT Since the introduction of non-stop support, gdb fails with this error at the point of no threads: No unwaited-for children left. It's because it added this check which prevents getting the next debug event: /* If there are no resumed threads left, bail. */ if (windows_process->windows_initialization_done && !any_resumed_thread ()) { ourstatus->set_no_resumed (); return minus_one_ptid; } This fixes it by changing any_resumed_thread to return true if there is no thread at all. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=34195 --- gdb/windows-nat.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c index 4cd301d4959..2fa15ada27a 100644 --- a/gdb/windows-nat.c +++ b/gdb/windows-nat.c @@ -1367,15 +1367,20 @@ windows_nat_target::thread_events (bool enable) m_report_thread_events = enable; } -/* True if there is any resumed thread. */ +/* True if there is any resumed thread, or no thread at all. */ bool windows_nat_target::any_resumed_thread () { + bool has_thread = false; for (thread_info &thread : all_non_exited_threads (this)) - if (thread.internal_state () == THREAD_INT_RUNNING) - return true; - return false; + { + has_thread = true; + if (thread.internal_state () == THREAD_INT_RUNNING) + return true; + } + DEBUG_EVENTS ("any_resumed_thread: has_thread=%d", has_thread); + return !has_thread; } /* Called for both EXIT_THREAD_DEBUG_EVENT and -- 2.54.0