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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F09D8EDEBF1 for ; Tue, 3 Mar 2026 20:52:33 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 38EA76B0098; Tue, 3 Mar 2026 15:52:33 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 366676B009B; Tue, 3 Mar 2026 15:52:33 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 29D386B009D; Tue, 3 Mar 2026 15:52:33 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 1B32E6B0098 for ; Tue, 3 Mar 2026 15:52:33 -0500 (EST) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id C5E258B02C for ; Tue, 3 Mar 2026 20:52:32 +0000 (UTC) X-FDA: 84505950144.28.6C7DEE6 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf08.hostedemail.com (Postfix) with ESMTP id 0C117160008 for ; Tue, 3 Mar 2026 20:52:30 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=YCGoGU5Y; spf=pass (imf08.hostedemail.com: domain of tj@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=tj@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1772571151; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=H7um9YRePm9A/3yajEgmBEmhDlDSDGvE6j2nvGvtfA4=; b=G8WSkyeAgpahqTMUE2GHQ+/Av0cWAbf98zveJyudwv3XEmdYvo8mSbW85wPi5NMuy0fxp7 2PPa1eUoTFXzCiytcqb3CwLa8JCqKRUeD+R8vhQIM0d4gcIWToX3yxwA6pZmczGJsoeQuq 3RMnxhB6OlxKNqiUqQn7x8N98g7QdG0= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=YCGoGU5Y; spf=pass (imf08.hostedemail.com: domain of tj@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=tj@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1772571151; a=rsa-sha256; cv=none; b=0wwccdU1ptoakGAMNmi27bFWqP6h5jlOjYdcA09yBhNfdjCzuMJqHTeFPSRG38wGQg9g9Y 9AOttERDUmdYNJv4PYd93mlfvf16YksCWNDxzbSE0NaTIiiZahQ38oFmt6i1giUqkCEqka 0Gg2s3CoP+JfB3TAEQLi763c/ft1S2k= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id B142940D98; Tue, 3 Mar 2026 20:52:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5CF02C116C6; Tue, 3 Mar 2026 20:52:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772571149; bh=Xeo5EivCSK8i5ewFGXEJ1ysYZsQ7yZF4ov0qH2Wp40A=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=YCGoGU5Y39HeDTKSZIz/fjegDB4ezi/z5WfVFuIsI15kReBnn/1bImL6tNTrZugWy zEIdljZz3VdMgP5z4YNVpKFnKfu/fNcryiqk9WOl6obxZrnZ1sB1Ei0rg81L/yr8R8 YNagly2k+91n9w27EUNbivoU8RTsUry5AStbx5KGb5Gqq8ox+7PYNCn/gPJHDVITeE No9E0TTCBHKiNp/RsPqi0WPCGAwxx9+hvnJCPPYfJJO2zvKYbs0zwdH+bXUCT1oxnH /rUMFRrQVnhAkj9X0iY7HoBFvVCdMKJ+mZt7IB3XP/HOMZ15Qqt5Wdl0PwZE0G8f8x a3pWuJ8Me+Kng== Date: Tue, 3 Mar 2026 10:52:28 -1000 From: Tejun Heo To: Johannes Berg Cc: Ben Greear , linux-wireless , "Korenblit, Miriam Rachel" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: 6.18.13 iwlwifi deadlock allocating cma while work-item is active. Message-ID: References: <18c4bfed-caca-bef3-a139-63d7fa48940a@candelatech.com> <3456b2c89f057900b39ce79ea8ca1154c5014e43.camel@sipsolutions.net> <0de6c8d1-d2fa-44ac-8025-cfcfecd87b02@candelatech.com> <35779061f94c2a55bb58dcd619ae91c618509cf4.camel@sipsolutions.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <35779061f94c2a55bb58dcd619ae91c618509cf4.camel@sipsolutions.net> X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 0C117160008 X-Stat-Signature: xpx8arqofpg9b8mhpckowxcu4x1f5mgb X-Rspam-User: X-HE-Tag: 1772571150-30067 X-HE-Meta: U2FsdGVkX19nhT2SDlymctcWPo7Vw8pE0JvLdUTScS96o0sPZCR9UYNOZ2L4eiTXkBjPwg+ZOG4xc6JFdFLlJMRCgt1H4rp6emcnzyiDn77CP2csw7NO+HkmcNFOr3wmyYuww0r04Ba0BE40FHaprNPFKGjfvnMw655cnCNi7jQe7IdX4n8lMRdpk2eFp9M8GzgUojuSE/hwDQQvHBU3GlN7ufY+1z4V1tXfkSVZBoFnXpXa4iC+TIcLLpYgTLfcAPfW04JpOHvc5rFfvh/Or+gGF4UcTtXhDYafMUjq8xpv30EBfHPYKAdj+SPCqe/jKx7crRVOChk0YdlvUy6Ch3ehTjchG39YA3GVKeUm9Q/Fhh8aI6onGsr16zq6/UWTFLZQMpvP9yN2nwoKRbzB6Npe5mnNxh7buYO0ACOxeffH8sChtUFOO2h9/OfecMzGYFzbCib8B5Qh4foslDmBwtM77cmM2l0mx7b7nXCqtWVQGiUN0as7RD3quz2x+r4D4t7CkHLxMKAsRAKdFoUWV8CHwiWbhrpXkNMMFjNFZywiFt9OCM3XVSXQtKmkFAZfW5nEzQdv7Kt9gKPpjRgHYcuyiR89oz15sep2O+mwBJLbuP/vq5kZqRZ9Widmr7RMEyCHUdtsznGcpaSOt/HqQYuGEFNuKIKXzax5thG0LsVIDA7Jgr7NF05EDw+XAmsfe2UDLRcbc3wPb4x0qVU9uab4Zpk4UQjCwkugvvhoV4FUcddZyj3YCBEfxLXn+ygSy7e/WQ9AXlSwrlnvG+HICqt/Ji0mY55gPGUGe0/8iUrYWV9eA1/PeMI79k+DGQdeSiLtACCqvd7dBiHR8aHpbnunzvo3MrJiXox6frXaTDIzLuuw3IOmIGgUVmKQoTqU12wduzJ5gPr9M/hMubRUI/oRlr1rv3NT/kbbr3XBCtWXQK5g4HMO6/wpBTEmP8QjsJpW9airUVgpzBvffQG nX2wuH/0 BJdjdH3MQELZbhGLHOTv+ip8aPjVD9ra/Ah4c9+JAHXMOz7KtTOGXerQAGWtySNRmHWhtbZyWOdZ4XV5gdJmeTf3eay4vgchnLfxrC7KcW3YI1GEvVF6VE211dBF9qk6ztuQ1N7nwkt2G5Lo+twrVK7qzvq+t9xaPjfwcfwxmJ31VSHkNUVL8J2JETu3GCNE5kxzR9tnZ7uqW6Nw3h122WE9RQw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, On Tue, Mar 03, 2026 at 12:49:24PM +0100, Johannes Berg wrote: > Fair. I don't know, I don't think there's anything that even shows that > there's a dependency between the two workqueues and the > "((wq_completion)events_unbound)" and "((wq_completion)events)", and > there would have to be for it to deadlock this way because of that? > > But one is mm_percpu_wq and the other is system_percpu_wq. > > Tejun, does the workqueue code somehow introduce a dependency between > different per-CPU workqueues that's not modelled in lockdep? Hopefully not. Kinda late to the party. Why isn't mm_percpu_wq making forward progress? That should in all circumstances. What's the work item and kworker doing? Thanks. -- tejun