{"id":2225549,"url":"http://patchwork.ozlabs.org/api/1.2/covers/2225549/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/cover/cover.1776755661.git.ionut.nechita@windriver.com/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/1.2/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"","list_archive_url":null,"date":"2026-04-21T07:19:30","name":"[v12,0/2] PCI/IOV: Fix SR-IOV locking races and AB-BA deadlock","submitter":{"id":92607,"url":"http://patchwork.ozlabs.org/api/1.2/people/92607/?format=json","name":"Ionut Nechita (Wind 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michal.wajdeczko@intel.com, piotr.piorkowski@intel.com,\n dtatulea@nvidia.com, mani@kernel.org, kbusch@kernel.org,\n lkml@mageta.org, alifm@linux.ibm.com, julianr@linux.ibm.com,\n ionut_n2001@yahoo.com, sunlightlinux@gmail.com","Subject":"[PATCH v12 0/2] PCI/IOV: Fix SR-IOV locking races and AB-BA deadlock","Date":"Tue, 21 Apr 2026 10:19:30 +0300","Message-ID":"","X-Mailer":"git-send-email 2.53.0","Content-Transfer-Encoding":"8bit","Content-Type":"text/plain","X-ClientProxiedBy":"VIXP296CA0001.AUTP296.PROD.OUTLOOK.COM\n (2603:10a6:800:2a9::16) To SJ2PR11MB7546.namprd11.prod.outlook.com\n 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definitions=2026-04-21_01,2026-04-20_02,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n clxscore=1015 suspectscore=0 bulkscore=0 impostorscore=0 phishscore=0\n spamscore=0 adultscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604210070"},"content":"From: Ionut Nechita \n\nHi Bjorn,\n\nThis is v12 of the fix for the SR-IOV race between driver .remove()\nand concurrent hotplug events.\n\nChanges since v11 (Mar 26):\n - Patch 2/2: added Reviewed-by from Niklas Schnelle (IBM) and\n Reviewed-by + Tested-by from Benjamin Block (IBM)\n - Rebased on linux-next (next-20260420)\n - No code changes\n\nChanges since v10 (Mar 18):\n - Patch 2/2: added kill_device() before device_release_driver() to\n prevent a new driver from binding between unbind and removal,\n closing the TOCTOU race window identified by Benjamin Block\n - Patch 1/2 unchanged from v10\n\nChanges since v9 (Mar 10):\n - NEW patch 2/2: fix AB-BA deadlock in remove_store() by calling\n device_release_driver() before pci_stop_and_remove_bus_device_locked(),\n as suggested by Benjamin Block (addresses Guenter Roeck's report)\n - Patch 1/2 unchanged from v9\n\nChanges since v8 (Mar 9):\n - Added Reviewed-by from Niklas Schnelle (IBM) and Tested-by (s390)\n - Added Fixes tags for the three related commits\n - Removed rescan/remove locking from sriov_numvfs_store() since\n locking is now handled in sriov_add_vfs() and sriov_del_vfs()\n - Rebased on linux-next (20260309)\n\nThe AB-BA deadlock:\n\n CPU0 (remove_store) CPU1 (unbind_store)\n -------------------- --------------------\n pci_lock_rescan_remove()\n device_lock()\n driver .remove()\n sriov_del_vfs()\n pci_lock_rescan_remove() <-- WAITS\n pci_stop_bus_device()\n device_release_driver()\n device_lock() <-- WAITS\n\nPatch 2/2 fixes this by:\n 1. Marking the device as dead via kill_device() so no new driver\n can bind (prevents TOCTOU race between unbind and removal)\n 2. Calling device_release_driver() before\n pci_stop_and_remove_bus_device_locked(), so both paths take\n locks in the same order: device_lock first, then\n pci_rescan_remove_lock\n\nNote: the concurrent unbind_store + hotplug-event case (where the\nhotplug handler takes pci_rescan_remove_lock before device_lock)\nremains a known limitation. This is a pre-existing issue that\nBenjamin Block is addressing separately in:\n https://lore.kernel.org/linux-pci/354b9e4a54ced67f3c89df198041df19434fe4c8.1773235561.git.bblock@linux.ibm.com/\n\nThis race has been independently observed by multiple organizations:\n - IBM (s390 platform-generated hot-unplug events racing with\n sriov_del_vfs during PF driver unload)\n - NVIDIA (tested by Dragos Tatulea in earlier versions)\n - Intel (xe driver hitting lockdep warnings and deadlocks when\n calling pci_disable_sriov from .remove)\n - Wind River (original reporter and patch author)\n\nTest environment:\n - Tested on s390 by Benjamin Block and Niklas Schnelle (IBM)\n - Tested on x86_64 with Intel and NVIDIA SR-IOV devices (earlier\n versions)\n\nBased on linux-next (next-20260420).\n\nLink: https://lore.kernel.org/linux-pci/20260214193235.262219-3-ionut.nechita@windriver.com/ [v1]\nLink: https://lore.kernel.org/linux-pci/20260219212648.82606-1-ionut.nechita@windriver.com/ [v2]\nLink: https://lore.kernel.org/lkml/20260225202434.18737-1-ionut.nechita@windriver.com/ [v3]\nLink: https://lore.kernel.org/linux-pci/20260228120138.51197-2-ionut.nechita@windriver.com/ [v4]\nLink: https://lore.kernel.org/linux-pci/20260303080903.28693-1-ionut.nechita@windriver.com/ [v5]\nLink: https://lore.kernel.org/linux-pci/20260306082108.17322-1-ionut.nechita@windriver.com/ [v6]\nLink: https://lore.kernel.org/linux-pci/20260308135352.80346-1-ionut.nechita@windriver.com/ [v7]\nLink: https://lore.kernel.org/linux-pci/20260309194920.16459-1-ionut.nechita@windriver.com/ [v8]\nLink: https://lore.kernel.org/linux-pci/20260310074303.17480-1-ionut.nechita@windriver.com/ [v9]\nLink: https://lore.kernel.org/linux-pci/20260318210316.61975-1-ionut.nechita@windriver.com/ [v10]\nLink: https://lore.kernel.org/linux-pci/20260326083534.23602-1-ionut.nechita@windriver.com/ [v11]\n\nIonut Nechita (Wind River) (2):\n PCI/IOV: Make pci_lock_rescan_remove() reentrant and protect\n sriov_add_vfs/sriov_del_vfs\n PCI: Fix AB-BA deadlock between device_lock and pci_rescan_remove_lock\n in remove_store\n\n drivers/pci/iov.c | 9 +++++----\n drivers/pci/pci-sysfs.c | 30 +++++++++++++++++++++++++++++-\n drivers/pci/probe.c | 11 +++++++++--\n 3 files changed, 43 insertions(+), 7 deletions(-)"}