From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ABB872C11D9; Tue, 10 Mar 2026 19:48:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773172131; cv=none; b=aroeLhXyHrYIzcb/MSGHUUvVMJefJJYaObYwTXZTyJVcGrtQ2WAisxsvOBjQAuux9RE+SpdYAz3LzbzEc+LUUfPVkZq8dBGMkg82Kc5afb9FYZ44lie4V7bWQnvaRTv3brf71tpIzXXuxhHTetBKdlCPspykEVZBm5oyWJKrb4k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773172131; c=relaxed/simple; bh=8RDQfE2xP1BWgVgje31aWjZMSOyhfmFEXWA2AkWRkvs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=RYCslHrozcdgMv67cwUk5MIh3qQNKT7A9WmOymC7eq7m2Rj2+16mLYF0TASo9YSzD9uNpWTzIioJJUUs27Nz6CIoXtr5djKuu43Ml4I7zGidStS+rpTwyFyN2vNkhOGs+3R70MRrZYHZfP2GN5yqoQy1dh0X9R4aTvTEGscF+Cw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=q5Wn9Npb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="q5Wn9Npb" 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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