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[2620:137:e000::1:20]) by mx.google.com with ESMTP id g3-20020a636b03000000b0050bcbcaf7edsi9274195pgc.820.2023.05.12.06.17.38; Fri, 12 May 2023 06:17:53 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=C3XQh+kz; dkim=neutral (no key) header.i=@linutronix.de; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240424AbjELMy5 (ORCPT + 99 others); Fri, 12 May 2023 08:54:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241183AbjELMyn (ORCPT ); Fri, 12 May 2023 08:54:43 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3208413C23 for ; Fri, 12 May 2023 05:54:22 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1683896061; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=s7JHgIguqRXAi/OOLsL9tLfDPiNsGDXsRJUcq20WaIk=; b=C3XQh+kz3xteIU5uowOEhCIW+jYH2i8gBVJHfMTRgtorG68FUEIvolz7NC8szqBhPNIP29 c9YHMpTwjnO0c6REJkSD5JRbF+zoHghyYE4S8vGW42L9mXlCBUM2fONswlxgRf8ti8KZr8 EQXLLB2ZvVCCTk+PHq2uBiOCusRoGZ1T6TjFHbCocbeMONnRbb8VaDJDP2p25d/pqxW1yq kKqugiCqwlng8F9aKQuo7KPrRwk4d+zLWk3flBODmL1znajeQDGSlj61Zzc1uL+tDIIIUp c8lHJFTv4TaYQd84xdVWFnaqRiUDqTQ9pSpuC0BLa7GoPY8jAGx9wRzYNsZ0Hg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1683896061; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=s7JHgIguqRXAi/OOLsL9tLfDPiNsGDXsRJUcq20WaIk=; b=VyR+NflhJ1vjl28Qm9YvkCNyRr/xRDH7jDQOnIglSHrZJ1bZjN66PP3h72oy+k2KWjesoY jeO5/Q61Z3H46MBg== To: Tetsuo Handa , Andrew Morton Cc: syzbot , syzkaller-bugs@googlegroups.com, Ingo Molnar , linux-kernel@vger.kernel.org, linux-mm Subject: Re: [PATCH] debugobject: don't wake up kswapd from fill_pool() In-Reply-To: References: <000000000000008ddb05fb5e2576@google.com> <6577e1fa-b6ee-f2be-2414-a2b51b1c5e30@I-love.SAKURA.ne.jp> <20230511204458.819f9009d2ef8b46cc163191@linux-foundation.org> Date: Fri, 12 May 2023 14:54:20 +0200 Message-ID: <87v8gxbthf.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, May 12 2023 at 19:57, Tetsuo Handa wrote: > On 2023/05/12 12:44, Andrew Morton wrote: >> On Thu, 11 May 2023 22:47:32 +0900 Tetsuo Handa wrote: >> >>> syzbot is reporting lockdep warning in fill_pool(), for GFP_ATOMIC is >>> (__GFP_HIGH | __GFP_KSWAPD_RECLAIM) which wakes up kswapd. >>> Since fill_pool() might be called with arbitrary locks held, >>> fill_pool() should not assume that holding pgdat->kswapd_wait is safe. https://lore.kernel.org/lkml/871qjldbes.ffs@tglx/