From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 976CAC433F5 for ; Sun, 13 Feb 2022 04:18:04 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 223546B0072; Sat, 12 Feb 2022 23:18:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 1AE466B0073; Sat, 12 Feb 2022 23:18:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 025A56B0078; Sat, 12 Feb 2022 23:18:03 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.28]) by kanga.kvack.org (Postfix) with ESMTP id E3E716B0072 for ; Sat, 12 Feb 2022 23:18:03 -0500 (EST) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay11.hostedemail.com (Postfix) with ESMTP id 9A1A580940 for ; Sun, 13 Feb 2022 04:18:03 +0000 (UTC) X-FDA: 79136448846.01.3C6F9FF Received: from mail-ej1-f51.google.com (mail-ej1-f51.google.com [209.85.218.51]) by imf20.hostedemail.com (Postfix) with ESMTP id 4A1D21C0009 for ; Sun, 13 Feb 2022 04:18:03 +0000 (UTC) Received: by mail-ej1-f51.google.com with SMTP id p9so7851016ejd.6 for ; Sat, 12 Feb 2022 20:18:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=+Ti2nk4zjdGL9qCHPI+wkzn/Zj6E+wju9LT/x+vfYco=; b=SJ6s05Ho3VIte1Mhbqxs8Q947UYeapNKgS4LOd6Axu7Z8VB6gv8gJZ9AINJY1KcmOH h36FRJQk0+lQUzhfc62qbJmbP+xH3+aWmiVe+Jj7U22WCA3UXwIEauB5ZElfOFAgryyx yfhhEwpu2SM4gF7Gq38FM8mJszOxGLFqOjEwq3Ll/qeMlQLbRvCsB3VkLDaovvSoRX87 jlaEfHDD8lmDMWXLrVl3dar/7CbcBtrd/EEss3XFvivZBEmZSd1IHF9YCRbSyE4biYiY kVy0u87wlNNfdYFK0DHxCsS0FEURSP9j5NVjvuHqdFRNUJ8GPXMOxkSXKonydSxM4Kiv xDCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=+Ti2nk4zjdGL9qCHPI+wkzn/Zj6E+wju9LT/x+vfYco=; b=KoNCkLpJULajBakH+0m1XaLgVXJQ7iwvDKpF6yyo3YaS5ET07mH/Tbpv2kLmbjMIi9 E5Uekh/yKcNaANYvXP5BhgW8npaL9TjPPLbeBgiHxxhoQsWy46m61JIoZ2XCVA9+e4yv b3hCytJcKHew2qDgTkRYX8uFLxTjcOS9me5lzICCy9pxuhI3yBxOJBMHk6UMBUAv15/r tB6iP0NHIgYgxF5OcitdDgKTAwrERi9BDu/lYUaOAD+UW1WrsmCTSvgxjKX1sjEp6hWT jsVAym45zJAvR4WJ3eSp8O85gsr2+ayOTBhzmSeDCNqyi0aO+gP5me4pgYPJir2OB2TH w/sg== X-Gm-Message-State: AOAM532PC2Wb6hG2HxXtD066q+KZT+5VCH7SSV5JrNOkb3BkJwfU8qgM KNEtX/1gtuEWRyWKrz7+qySxeX21zdNLjVqAZKA= X-Google-Smtp-Source: ABdhPJwxvsg2Ij6Z1o4x4TJvJwWJbP3hliNKXgonsOvcal8S7E6rhGePIR3CkCEEU3tglVkveoHAxt8qUGlZFAWHAJI= X-Received: by 2002:a17:906:77d5:: with SMTP id m21mr1660225ejn.486.1644725882017; Sat, 12 Feb 2022 20:18:02 -0800 (PST) MIME-Version: 1.0 References: <244218af-df6a-236e-0a52-268247dd8271@molgen.mpg.de> In-Reply-To: From: Zhouyi Zhou Date: Sun, 13 Feb 2022 12:17:50 +0800 Message-ID: Subject: Re: BUG: sleeping function called from invalid context at include/linux/sched/mm.h:256 To: Matthew Wilcox Cc: Paul Menzel , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, Linux-MM , Peter Zijlstra , Josh Poimboeuf , Jason Baron , rcu , LKML , "Paul E. McKenney" Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 4A1D21C0009 X-Rspam-User: Authentication-Results: imf20.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=SJ6s05Ho; spf=pass (imf20.hostedemail.com: domain of zhouzhouyi@gmail.com designates 209.85.218.51 as permitted sender) smtp.mailfrom=zhouzhouyi@gmail.com; dmarc=pass (policy=none) header.from=gmail.com X-Stat-Signature: 3fy9q1r6cnu4cbaynmz3b9puy86zu4sr X-HE-Tag: 1644725883-852607 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Thank Matthew for correcting me On Sun, Feb 13, 2022 at 12:09 PM Matthew Wilcox wrote: > > On Sun, Feb 13, 2022 at 11:19:09AM +0800, Zhouyi Zhou wrote: > > I think the key to the problem lies in your attached console.log > > (pasted below), at times 0.014987 and 0.015995, I see there are two > > locks (cpu_hotplug_lock and jump_label_mutex) holded while > > kmem_cache_alloc calls __might_resched (0.023356). > > Those are both sleeping locks (a percpu_rwsem and mutex, respectively). > There is no problem with sleeping while holding a mutex or rwsem. >From console.log, I see [ 0.012154][ T1] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:256 [ 0.013128][ T1] in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 1, name: swapper/0 >From ___might_sleep, I see 9506 if ((preempt_count_equals(preempt_offset) && !irqs_disabled() && 9507 !is_idle_task(current) && !current->non_block_count) || 9508 system_state == SYSTEM_BOOTING || system_state > SYSTEM_RUNNING || 9509 oops_in_progress) 9510 return; I guess it is irq_disable which cause the bug. Thanks Zhouyi