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 B4639FD4F31 for ; Tue, 10 Mar 2026 19:48:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id DA57A6B0088; Tue, 10 Mar 2026 15:48:54 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D4FB06B0089; Tue, 10 Mar 2026 15:48:54 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C3AA16B008A; Tue, 10 Mar 2026 15:48:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id A14246B0088 for ; Tue, 10 Mar 2026 15:48:54 -0400 (EDT) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 56320C1673 for ; Tue, 10 Mar 2026 19:48:54 +0000 (UTC) X-FDA: 84531191388.09.2D6C028 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf14.hostedemail.com (Postfix) with ESMTP id BBFED10000B for ; Tue, 10 Mar 2026 19:48:52 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=q5Wn9Npb; spf=pass (imf14.hostedemail.com: domain of tj@kernel.org designates 172.105.4.254 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=1773172132; 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=i3F4iPePtn1x4aGt97CquFRyDRkp5+os6WjBiJPsrJY=; b=VR8mYaLpnQOKc3NmtIJ25a3Es8egQhWYKimCXpJNHaXW6sfm8h8yMNRjgSr+o+nQXpelf8 oAKkkhLgF4JUGk1nORIsoKNIqwao9yF1+8oNZTvzUGP6gFtLuA9Ks3v+FcRuuJi7va+Crx mTeU71VkknBcE9bYkJOAYgwC+yWincw= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=q5Wn9Npb; spf=pass (imf14.hostedemail.com: domain of tj@kernel.org designates 172.105.4.254 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=1773172132; a=rsa-sha256; cv=none; b=UZqa7WUzaben+u6ajBxywveNtkoq1gj/zZ2RCEK3igky2K7ryuClAb6ro+SQNP+q+swWO2 Z3ZNSg1LwQk2xckFZnVQs0kqqSXp0v9HG/etb8j9KwpxJ2R8eH2yrKrBCRF14D/D5gz36V DqWgjPxwnztBIkyC9dFu6JnQZ75s0Ug= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id DA9D260054; Tue, 10 Mar 2026 19:48:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 71781C19423; Tue, 10 Mar 2026 19:48:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773172131; bh=8RDQfE2xP1BWgVgje31aWjZMSOyhfmFEXWA2AkWRkvs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=q5Wn9Npb6xtJVj5PVvDE2FjOPMVFmtv4Vy3sXQJK5oNzQiA2ouG7R5fG9SL9DMrAp PoqTKHzKkywF0Xwocplj3jIsERUmRwrdrydepr/3LMPmYkRJKhNHq12jkfTzkEzTBY sFijpy7ArNS7UKJFrdhZMjqdRnIYMLmh3Y/t23ko1SUWu5uTDkrXiscuYrXfJYT2Yw rHNUGcWQcF99+X8AxkhOSPAb/bCV7EBaGnnVNQi2ilxIkkvbBrYnumiYnY5XNmJbub 08TzHLTX+6olTVPLxJtwXYbI93zCHxCFuTlW3koXJDDWo0QxgxefjQ0Pn3/uqViOti l2tK8oGni0qHw== Date: Tue, 10 Mar 2026 09:48:50 -1000 From: Tejun Heo To: Ben Greear Cc: Johannes Berg , linux-wireless , 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: <3303d57a4ea6776dbc66ca72441023f76e6f1234.camel@sipsolutions.net> <35a7ebcf-862f-0b3a-a245-c32196a58692@candelatech.com> <68c1ca1381d1871fff72b211890a64eb@kernel.org> <5b9b93df8774810a43fceb359906604b@kernel.org> <729164a1-9dd4-c9a4-f092-d93d775257e0@candelatech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Queue-Id: BBFED10000B X-Rspamd-Server: rspam08 X-Stat-Signature: ei7esodnr66ntc3bq3joyqaj3b3x4y87 X-HE-Tag: 1773172132-781773 X-HE-Meta: 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 OnLG1oX7 trianvrVgFZZk5I+ygjKWVUXh8n1iGzzst1gGxRzzAhncDtvAT6h+7zEaxfjLhmaluHXm+VDO9/krTZWZCUJ/fdXdzWTe0fw4p4f3tdVd8uVz33H1DKkA9/mYS5S6ArBEV0ZaDv7QWl7d4x+i+lZbXht7MIRcPIunbol+TytBqvn71nbyWkLsJJJ7GVPlFc4S2LgdZ44oTV/Bo5QCjjj35b54/g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Mar 10, 2026 at 09:47:59AM -1000, Tejun Heo wrote: > Hello, > > On Tue, Mar 10, 2026 at 12:18:49PM -0700, Ben Greear wrote: > ... > > But could this work-item (re)initialization also explain work-queue system going > > weird? Just using kthreads, which 'fixes' the problem for me, > > really shouldn't make a difference to the code below, so probably > > it is not related? > > Oh, re-initing can deifnitely corrupt things. Workqueue shares work list > across all work items sharing the pool, so the blast radius can be bigger. > ie. It'd be *possible* for kthread_worker to get lucky. BTW, if you enable CONFIG_DEBUG_OBJECTS_WORK, re-init should trigger a dump. Thanks. -- tejun