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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-Rspam-User: X-Stat-Signature: g5q39crjpjbin9ts5brx9saourwsxp1s X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 6B9E412000C X-HE-Tag: 1683896063-625572 X-HE-Meta: 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 QIZT0+I9 mpwrfc6FFqLDj2gH6wRr+oQMbQE+qOdWLIZ7V0NR5chjNr4RdVvpdYlm2U9sqyrNqcD5YOy4WnFK4vQZiupn2k1MH43C96iUMWfg6wiTRFQrBEJ7hhd/26ceu+ssX3WcpptTa1mGjciz04nchPeFurM+jVB5Lyk7ejmJibcgHGqbuW0WX1uungL2zKL/KzFektFUbA8t1G9JpZaBtW3aZT5w5J67YnFryn/kP3HX8v0gPRCd2H4n2gSWrtIUxAKfpf7Yu37kweOp6yqm3EuCCxF/eXA== 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: 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/