From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lf1-f46.google.com (mail-lf1-f46.google.com [209.85.167.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B965A45BE7; Sun, 7 Jul 2024 16:32:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.46 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720369935; cv=none; b=EtdtRGLJ2UEjPbbHs02poWqrDsatwK77Aszdxtkj7dbpwEXSKqJprG7/KqESLVxxMXyjGnMzC8KbL9VZ0+IGT9g64gFc2o5VHVj9mhwnjiIyiAj2Y31ZejKMqU4nbMvuTm2rpd3L3tcFtVY2s1PlodO26Hx4vL5HNlb0IYwZVO4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720369935; c=relaxed/simple; bh=iGpE5U5Tlpaw5uTZKYNRfWXK6kMLgTN1qBfiQRbLzGg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=bujbFLSO/NUFH89zYtuC7sG9MscNCRzCnQgl3DMItcrmdW+/gQpg9HalUdXx01B3AOepOsi1jWw8lOnINpJryebrfn74kiFe96wipKMFPOAoJrDisZluXmVl6w5snNQ/wubj9qER5S68G8q/1Oc/FF7vENh0yZb68KwiCxQCHWI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=l6rnungG; arc=none smtp.client-ip=209.85.167.46 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="l6rnungG" Received: by mail-lf1-f46.google.com with SMTP id 2adb3069b0e04-52e9fe05354so4557668e87.1; Sun, 07 Jul 2024 09:32:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1720369932; x=1720974732; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=YV3u710GY3e7lyl90PF3A1pw0/T5hESpY3+kLAxxYOY=; b=l6rnungGlYi/XvflBfGzfJRBR1gBmirVa2gPPLiMyi5BsJ2vQDgV26a9kyIYclLFWJ 147AF/xgc+7Cqwre5pt5nqlxRAF5DV40hjMA7mPrjyzohMg2Buvr6OtDFP3X+TAfU5Pm UsGrK0CxKdrtTydDvscu/8+gtEZyCgoGNPBfGXWipyxBtCSSzkIYdoHaoPsmL+nZECSy R4D/5AS0t2utIGrPiK91PS3j2qjtfNFby72d8ayTxg1fEsUpKLHbjKDDLFH4Skl/3l11 x9Vhj3I6xNhfDyCrY3q10QEqlOBCz/3w4u5yRUm/2vc+WJBQuHgOPd8W8PF8b31W80MZ Fu+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1720369932; x=1720974732; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=YV3u710GY3e7lyl90PF3A1pw0/T5hESpY3+kLAxxYOY=; b=L3wmwYbUJ5jddC2rB5bphdsUWHjgYlR7wOv2xpIzncGfzJmnTuJelCwCwvZE5W7MyI EMHGj3M8xAho/utleKjlEpHyKQggToZEmktM+cTlR7UGxhYOL0ojnTWEIlLjdLXjb7Jj J/rqIkYk3xvcutAw6VJv078xRWqUTdbT7Q6kELzu8vy0IS2jR/c/80NCPdMxbd4+tLV8 ttWpuzxxlXKbiSQlWU7P0yfc2Pw/MeInWnHPMo9CfNmgKsjHzbIzfVydCt50ac1hsMqM MWBFi76jrDENJEulZrvEhsyU8JEJnBCUnDjYmOlc0Ym2GMz95fUb5be1fBp8VSmUwrXU Ciww== X-Forwarded-Encrypted: i=1; AJvYcCW05V70j9P8MvAISQzF1Hd7HcxPXri9lsNBUlVfOaENxDPO3uABQqTEpLnuCCWQJ7gRewFuV/s+5k4BfBNLPmsXRvvSPm7Kde0ZU/BF X-Gm-Message-State: AOJu0YxHG/b+ngtD8ZkwrAb8nXwCR7Qh/7XxkkvEOApmrfdoqZBAo8FX /4wyCQAskOMsGOoxK2UBNGv0RK7uCxSQYkdMB+LfSkNKkv0Dfi5V6gj63A== X-Google-Smtp-Source: AGHT+IHHttRaz4G+7Y0TScCW9snTeVMedhNadl0e6Y9ONiRVt/LVUiGN4CIBg3/NA/pyHn/LOhmdTA== X-Received: by 2002:a05:6512:2822:b0:52e:9951:7881 with SMTP id 2adb3069b0e04-52ea06b0d1amr7787563e87.52.1720369931307; Sun, 07 Jul 2024 09:32:11 -0700 (PDT) Received: from 127.0.0.1localhost ([185.69.144.218]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4264a1e8014sm134335215e9.21.2024.07.07.09.32.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 07 Jul 2024 09:32:11 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com, Oleg Nesterov , Andrew Morton , Christian Brauner , Tycho Andersen , Thomas Gleixner , linux-kernel@vger.kernel.org Subject: [PATCH 0/2] fix task_work interation with freezing Date: Sun, 7 Jul 2024 17:32:09 +0100 Message-ID: X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit It's reported [1] that a task_work queued at a wrong time can prevent freezing and make the tasks to spin in get_signal() taking 100% of CPU. Patch 1 is a preparation. Patch 2 addresses the issue. [1] https://github.com/systemd/systemd/issues/33626 Pavel Begunkov (2): io_uring/io-wq: limit retrying worker initialisation signal: rerun task_work while freezing io_uring/io-wq.c | 10 +++++++--- kernel/signal.c | 4 ++++ 2 files changed, 11 insertions(+), 3 deletions(-) -- 2.44.0