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 D06483074A6 for ; Wed, 3 Sep 2025 14:59:08 +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=1756911550; cv=none; b=u0itozC2dVUmf3tecZH8gTJD/XFZt591HYgIDLnNBjH57W73Nd+Whkvqnf8D6VV5vQiGXpnXeg0w7RayuCb0KvUJmUCf/MLTmTT5yP663SC/R7oh0IAUuUJclmPLHmOU4oQbjj2SNtfq+AY/qQfR7NfFfxgrM75kZKdAqDr4rms= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756911550; c=relaxed/simple; bh=PW6jHR9+zX+ViK7Tgdt+U7jJMoIyJN4sK1F2Xz5gU24=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=X8ikU3dcVsESvWyrw4d09jZOBwvzx8cFgCWMAbQ6S/dy4j4tCAA+DdqSXCWy0eukoaxAAqkNk2iNC0rnQuGwcjW/6QYfS6jl32LQn4O0qLWZDqnJEiwOx/b2gpEWEa+mA+H1Zb7GGYByycQqHDC+1/8ZnuwG/COhuRIWizyd4PQ= 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=YvdESYoT; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=zZ0pLElK; 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="YvdESYoT"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="zZ0pLElK" Date: Wed, 3 Sep 2025 16:59:05 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1756911546; 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=/CVut3AfTWRze481ZKUx7S7RslYpJDeo5SsE7cVwThM=; b=YvdESYoTT5Mm4wZor3Nr4g8iEb52Rrus+e9kGSkubEBvg4fsF5GB7BhO6G8TA0aifMxfdq +96vultzFsMh34kvQJ8sPmqi3LXf9P7sHyfprn6ZzoV2i0j1kf3uee2RltgIJrZPmxzO5t NYt5kbQJ6cw213JvmzsMNKXOhD+VKt3goacWJXhvhvKWYzTUIdmB1lDc2a5LDA8Wls2ErK 3HC+22zP96omAj1cQTzrP5v7sYXBrDu1Lb0l818oGa9+3SrgPhwdwhlOWwcu9PhKiXWE5y FK2ADKOIRk5a+2sZT3q28tEd/Jv9tukuv6/IEhLozsIfDNcB7s9e+7OAlegoqQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1756911546; 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=/CVut3AfTWRze481ZKUx7S7RslYpJDeo5SsE7cVwThM=; b=zZ0pLElKAksFr0Gof+otXBlIQsZS+nSMK8jUr2J/DDyNVNKGUL88A7z70fmr1kjwJJndIt E9PnQH/NLpVj2hDg== From: Sebastian Andrzej Siewior To: Hillf Danton Cc: syzbot , linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [sound?] possible deadlock in __snd_pcm_lib_xfer (2) Message-ID: <20250903145905.r7Ak4Wya@linutronix.de> References: <68b269e9.a00a0220.1337b0.001f.GAE@google.com> <20250830065638.6116-1-hdanton@sina.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=utf-8 Content-Disposition: inline In-Reply-To: <20250830065638.6116-1-hdanton@sina.com> On 2025-08-30 14:56:37 [+0800], Hillf Danton wrote: > > syz.0.46/6843 is trying to acquire lock: > > ffff8880b8823d90 ((softirq_ctrl.lock)){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline] > > ffff8880b8823d90 ((softirq_ctrl.lock)){+.+.}-{3:3}, at: __local_bh_disable_ip+0x264/0x400 kernel/softirq.c:168 > > > Given softirq_ctrl is percpu, this report is false positive. No. This can happen on a single CPU. Sebastian