From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 C6582238178 for ; Tue, 17 Feb 2026 07:19:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771312795; cv=none; b=pmxzWiMo2TKjfGB5y5q7pkmIj/edFHebfWtukL1AuRzsujMO02RPNjo1PZ6oJJEB+a8tPhS+CTvOnG1yLurnmh8c8iNN07MyS7Oq/rxtYD27Zbu9/rUutxW/Lgyj5BOz6/WN+WeEEwgMhtZZTPRvIGk4kfei14EBCnzMJoyGrvo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771312795; c=relaxed/simple; bh=eQg6QLcVDKqCgHiLxCzWj4OYcujtxb6HPqfPmoO6P7Q=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=RI3ZevJpXxvlcoFGOLbe33anprxOsqBlbOMDjOdN5Od7uctIwDfY16VirIr/Tz08dsdrUuVYqzUgQu1dJwqk9kh/9AJgL2DRA8B6rio0Sg3eLcDd7XkWLFeD7hsl4IiuBQB/5Oc/JLbvFfdrfDSp/B9g2rivd/JlwWeuphhYMec= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=rcPGJqkk; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=SJikSH17; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="rcPGJqkk"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="SJikSH17" Date: Tue, 17 Feb 2026 08:19:52 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1771312793; 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=H+nEmqG34AHLoCUk7+SmL8r7gVNhaExyqHx2t8wbuKI=; b=rcPGJqkkl3gdlIJopII+1ey0vTwe2DjcP17Sz1I91QINVIAwkZueMminWVHyY8wUQ85AbG 91/GFqjgQ/flL0QKs8SpQFExdIfj3LaIA4Rw0dL6aWnyDQnGtgTuVKho9azuWzuTL8fQGR l9Ymo4odj/n8R2t6Dg+X5AFBWZbKeAesa77hU1USxor2h1nc6zszEsZBRaCeGp/+F5LZkQ 0VYmlIQBZK/iNDta7wx65g7phxh2OlqkKq0w5Ie0n12pVcW1TV9kt2RQ58Ud40hrDwQCBK +asNVjmwJ87TGs+SeRhYX+0vvi+D+5/zqIcPvUTltYt+M1M2WOoRRPUdtqSKvg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1771312793; 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=H+nEmqG34AHLoCUk7+SmL8r7gVNhaExyqHx2t8wbuKI=; b=SJikSH17WRUPqZAZsUv1mCC/DrwTL3IoanVxhn4T1EsMMwmD7dlZ5deZvGAR09v8REOGxJ tpCfIeJp9/8AsRAQ== From: Sebastian Andrzej Siewior To: Bert Karwatzki Cc: Thomas Gleixner , linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: Re: "Dead loop on virtual device" error without softirq-BKL on PREEMPT_RT Message-ID: <20260217071952.WCXLGs5-@linutronix.de> References: <20260216134333.412332-1-spasswolf@web.de> <6274de932f4a62c51b424b65fc875ef3cb5ffd60.camel@web.de> <20260216153745.CA3__zRc@linutronix.de> <37d6e27f96afb57c5716798530cb3560d25202e5.camel@web.de> Precedence: bulk X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <37d6e27f96afb57c5716798530cb3560d25202e5.camel@web.de> On 2026-02-17 00:48:25 [+0100], Bert Karwatzki wrote: > The problem seems to be that different preemtible threads try to send skbs. This does not matter because the counter is per-thread not per-CPU. > 2026-02-17T00:29:24.212231+01:00 [ T1513] Dead loop on virtual device wlp4s0, fix it urgently! Could you please do a backtrace here, for instance via WARN_ON_ONCE() > Bert Karwatzki Sebastian