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Wed, 22 Apr 2026 14:31:14 +0000 (GMT) Received: from p1gen4-pw042f0m (unknown [9.52.223.163]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTPS; Wed, 22 Apr 2026 14:31:14 +0000 (GMT) Received: from bblock by p1gen4-pw042f0m with local (Exim 4.99.1) (envelope-from ) id 1wFYbi-0000000Fz5d-2Fng; Wed, 22 Apr 2026 16:31:14 +0200 Date: Wed, 22 Apr 2026 16:31:14 +0200 From: Benjamin Block To: Bjorn Helgaas Cc: Ionut Nechita , Tobias Schumacher , linux-pci , Gerd Bayer , Vasily Gorbik , Christian Borntraeger , Niklas Schnelle , Sven Schnelle , linux-kernel , Ionut Nechita , Heiko Carstens , Farhan Ali , linux-s390 , Alexander Gordeev , Andreas Krebbel , Matthew Rosato , Julian Ruess Subject: Re: [PATCH v3 3/3] s390/pci: Fix circular/recursive deadlocks in PCI-bus and -device release Message-ID: <20260422143114.GD2707369@p1gen4-pw042f0m> References: 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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Sender: Benjamin Block X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: 7e1QERqw--Lhv4FCdU2_1LuNWKOjZGkk X-Proofpoint-ORIG-GUID: 9VsENo6kmKgg5TKXaTW1o_SvShJbismp X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIyMDEzOCBTYWx0ZWRfX6aSwDKvCqzu8 Vyh2s63uolMb7hGqEuK0GFIW89F2TQ7bt7OfvzDDkwU2MxvTCSA7iVyDdaGi7M9iHdyq0icSXlk vesFJcwL/WZCbEzhiVGGmX8gSBCU1IW6SxlyR0OZG0aWcQDEAIPd2WcuEQYtqwlQBnuPfDrL06d oJ/6c89rR+qwx1sMFcjyN0ZPJ5ubVDQREXbSRAbkD0DIuwE7Lozriz9bgpYa75GdA5mUj/7tbSE 0GAVTmbLBn/kzsBER3YGbV+3fN2I1T6j97JSBLwBc/Zv5qzYMXpOQInPDFdqNpoXdQNaQFT26+e WzjE91SGOIACvOLTpry/FMzkWyrysi1/Md1EEkfmL2OC708084pQF/ctgKhxv0eFgVo2/tV4CIT ja3iEKtSlfFlxrtWIaPyOmfdC5KmnGIb/SACsrQUHpTpCT9sM4fua0u3fgzcTgmgmGF2niAm4+x erA7tc1xZwJqvqoImmg== X-Authority-Analysis: v=2.4 cv=SJxykuvH c=1 sm=1 tr=0 ts=69e8dbb7 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=8nJEP1OIZ-IA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=Tnmygc6K0V6LZGle_IMA:9 a=3ZKOabzyN94A:10 a=wPNLvfGTeEIA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-22_01,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 malwarescore=0 impostorscore=0 bulkscore=0 lowpriorityscore=0 phishscore=0 clxscore=1015 adultscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604220138 On Wed, Apr 22, 2026 at 04:22:13PM +0200, Benjamin Block wrote: > When removing PCI device or PCI bus objects there are a couple of > call-chains where it is possible that the kernel runs into a circular > deadlock involving the central `pci_rescan_remove_lock`. > --8<-- > > Fixes: 05bc1be6db4b2 ("s390/pci: create zPCI bus") > Fixes: ab909509850b2 ("PCI: s390: Fix use-after-free of PCI resources with per-function hotplug") > Reviewed-by: Niklas Schnelle > Tested-by: Niklas Schnelle > Signed-off-by: Benjamin Block > Reference-ID: JUP1193979 Ah, damn. This `Reference-ID` wasn't meant to be in the "final" email. Sorry. I'll re-send without it. -- Best Regards, Benjamin Block / Linux on IBM Z Kernel Development IBM Deutschland Research & Development GmbH / https://www.ibm.com/privacy Vors. Aufs.-R.: Wolfgang Wendt / Geschäftsführung: David Faller Sitz der Ges.: Ehningen / Registergericht: AmtsG Stuttgart, HRB 243294