From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C9A013E024; Wed, 3 Jul 2024 11:20:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720005656; cv=none; b=mwxcDrXgrbdWfmoZ+pZJtXi+4yenYfXANyXZQkzkATznngdsyOU71qLRKnCMBYuDd9EBBNqLLt9O9RnmEj5nvwFvSzu1PBVqWffks7KFEftxunwB7THkdt2XqLGVvnqx12O6IFqdtmjap57nvRg5qR2KLObIjlA8n6sd6lB9PsE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720005656; c=relaxed/simple; bh=TK76AAZ4q6YmKVG8dAr995hacdE8gGU6380W2PRBQ7k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mQo7CsDjpPmTpUWTERGy4rMvYpXS4nImzyyvpYWbSr9wfpPj6f4ZiYtq6mBlXtQrtULsQLXJ9Of25ZL5SHXErUnHADYLmBWMy/FdtodegXmySwIFZug6/J6OHUbpj48IaTwY0iPl5Y/oqQt7uu6CuMK+Q4WDbsWapPXUeuHe/E4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0RmfIBMT; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="0RmfIBMT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B681CC2BD10; Wed, 3 Jul 2024 11:20:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720005656; bh=TK76AAZ4q6YmKVG8dAr995hacdE8gGU6380W2PRBQ7k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0RmfIBMTsy+HDU9q4L7I9jQiSgOj6iZ6yp8NfpoMh3DCtKXDtlKce3n/AP7cIABj5 RN9YwcyKypabUPKh4zyzt6QQRju1+GtWuLdU/rxPMpl0TB/eSIvy/4cqgbwmglgc4B OlFMyOYwTvcQ/JwKiw0FzpTUyw/B16sZrEqPSe18= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zqiang , "Paul E. McKenney" , "Uladzislau Rezki (Sony)" , Sasha Levin Subject: [PATCH 5.15 153/356] rcutorture: Make stall-tasks directly exit when rcutorture tests end Date: Wed, 3 Jul 2024 12:38:09 +0200 Message-ID: <20240703102918.891631297@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240703102913.093882413@linuxfoundation.org> References: <20240703102913.093882413@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zqiang [ Upstream commit 431315a563015f259b28e34c5842f6166439e969 ] When the rcutorture tests start to exit, the rcu_torture_cleanup() is invoked to stop kthreads and release resources, if the stall-task kthreads exist, cpu-stall has started and the rcutorture.stall_cpu is set to a larger value, the rcu_torture_cleanup() will be blocked for a long time and the hung-task may occur, this commit therefore add kthread_should_stop() to the loop of cpu-stall operation, when rcutorture tests ends, no need to wait for cpu-stall to end, exit directly. Use the following command to test: insmod rcutorture.ko torture_type=srcu fwd_progress=0 stat_interval=4 stall_cpu_block=1 stall_cpu=200 stall_cpu_holdoff=10 read_exit_burst=0 object_debug=1 rmmod rcutorture [15361.918610] INFO: task rmmod:878 blocked for more than 122 seconds. [15361.918613] Tainted: G W 6.8.0-rc2-yoctodev-standard+ #25 [15361.918615] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [15361.918616] task:rmmod state:D stack:0 pid:878 tgid:878 ppid:773 flags:0x00004002 [15361.918621] Call Trace: [15361.918623] [15361.918626] __schedule+0xc0d/0x28f0 [15361.918631] ? __pfx___schedule+0x10/0x10 [15361.918635] ? rcu_is_watching+0x19/0xb0 [15361.918638] ? schedule+0x1f6/0x290 [15361.918642] ? __pfx_lock_release+0x10/0x10 [15361.918645] ? schedule+0xc9/0x290 [15361.918648] ? schedule+0xc9/0x290 [15361.918653] ? trace_preempt_off+0x54/0x100 [15361.918657] ? schedule+0xc9/0x290 [15361.918661] schedule+0xd0/0x290 [15361.918665] schedule_timeout+0x56d/0x7d0 [15361.918669] ? debug_smp_processor_id+0x1b/0x30 [15361.918672] ? rcu_is_watching+0x19/0xb0 [15361.918676] ? __pfx_schedule_timeout+0x10/0x10 [15361.918679] ? debug_smp_processor_id+0x1b/0x30 [15361.918683] ? rcu_is_watching+0x19/0xb0 [15361.918686] ? wait_for_completion+0x179/0x4c0 [15361.918690] ? __pfx_lock_release+0x10/0x10 [15361.918693] ? __kasan_check_write+0x18/0x20 [15361.918696] ? wait_for_completion+0x9d/0x4c0 [15361.918700] ? _raw_spin_unlock_irq+0x36/0x50 [15361.918703] ? wait_for_completion+0x179/0x4c0 [15361.918707] ? _raw_spin_unlock_irq+0x36/0x50 [15361.918710] ? wait_for_completion+0x179/0x4c0 [15361.918714] ? trace_preempt_on+0x54/0x100 [15361.918718] ? wait_for_completion+0x179/0x4c0 [15361.918723] wait_for_completion+0x181/0x4c0 [15361.918728] ? __pfx_wait_for_completion+0x10/0x10 [15361.918738] kthread_stop+0x152/0x470 [15361.918742] _torture_stop_kthread+0x44/0xc0 [torture 7af7f9cbba28271a10503b653f9e05d518fbc8c3] [15361.918752] rcu_torture_cleanup+0x2ac/0xe90 [rcutorture f2cb1f556ee7956270927183c4c2c7749a336529] [15361.918766] ? __pfx_rcu_torture_cleanup+0x10/0x10 [rcutorture f2cb1f556ee7956270927183c4c2c7749a336529] [15361.918777] ? __kasan_check_write+0x18/0x20 [15361.918781] ? __mutex_unlock_slowpath+0x17c/0x670 [15361.918789] ? __might_fault+0xcd/0x180 [15361.918793] ? find_module_all+0x104/0x1d0 [15361.918799] __x64_sys_delete_module+0x2a4/0x3f0 [15361.918803] ? __pfx___x64_sys_delete_module+0x10/0x10 [15361.918807] ? syscall_exit_to_user_mode+0x149/0x280 Signed-off-by: Zqiang Signed-off-by: Paul E. McKenney Signed-off-by: Uladzislau Rezki (Sony) Signed-off-by: Sasha Levin --- kernel/rcu/rcutorture.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 82c6046db8a42..e9323cc5da73b 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2061,8 +2061,8 @@ static int rcu_torture_stall(void *args) preempt_disable(); pr_alert("%s start on CPU %d.\n", __func__, raw_smp_processor_id()); - while (ULONG_CMP_LT((unsigned long)ktime_get_seconds(), - stop_at)) + while (ULONG_CMP_LT((unsigned long)ktime_get_seconds(), stop_at) && + !kthread_should_stop()) if (stall_cpu_block) { #ifdef CONFIG_PREEMPTION preempt_schedule(); -- 2.43.0