Greeting, FYI, we noticed the following commit (built with gcc-9): commit: 43daaa99829219efa59a6327839e692066abbe0f ("genirq/msi: Simplify sysfs handling") https://git.kernel.org/cgit/linux/kernel/git/tglx/devel.git msi in testcase: kernel-selftests version: kernel-selftests-x86_64-a1616593-1_20211225 with following parameters: group: group-00 ucode: 0x11 test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel. test-url: https://www.kernel.org/doc/Documentation/kselftest.txt on test machine: 288 threads 2 sockets Intel(R) Xeon Phi(TM) CPU 7295 @ 1.50GHz with 80G memory caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; [ 68.314909][ T12] BUG: KASAN: use-after-free in __pci_enable_msi_range (drivers/pci/msi/msi.h:36 drivers/pci/msi/msi.c:474 drivers/pci/msi/msi.c:905) [ 68.314909][ T12] Read of size 2 at addr ffff888100063664 by task kworker/0:1/12 [ 68.314909][ T12] [ 68.314909][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.16.0-rc5-00094-g43daaa998292 #1 [ 68.314909][ T12] Hardware name: Intel Corp. GROVEPORT/GROVEPORT, BIOS GVPRCRB1.86B.0018.D06.1710190403 10/19/2017 [ 68.314909][ T12] Workqueue: events work_for_cpu_fn [ 68.314909][ T12] Call Trace: [ 68.314909][ T12] <TASK> [ 68.314909][ T12] dump_stack_lvl (lib/dump_stack.c:107) [ 68.314909][ T12] print_address_description+0x21/0x140 [ 68.314909][ T12] ? __pci_enable_msi_range (drivers/pci/msi/msi.h:36 drivers/pci/msi/msi.c:474 drivers/pci/msi/msi.c:905) [ 68.314909][ T12] ? __pci_enable_msi_range (drivers/pci/msi/msi.h:36 drivers/pci/msi/msi.c:474 drivers/pci/msi/msi.c:905) [ 68.314909][ T12] kasan_report.cold (mm/kasan/report.c:434 mm/kasan/report.c:450) [ 68.314909][ T12] ? __pci_enable_msi_range (drivers/pci/msi/msi.h:36 drivers/pci/msi/msi.c:474 drivers/pci/msi/msi.c:905) [ 68.314909][ T12] __pci_enable_msi_range (drivers/pci/msi/msi.h:36 drivers/pci/msi/msi.c:474 drivers/pci/msi/msi.c:905) [ 68.314909][ T12] pci_alloc_irq_vectors_affinity (drivers/pci/msi/msi.c:1029) [ 68.314909][ T12] ? pci_enable_msix_range (drivers/pci/msi/msi.c:1008) [ 68.314909][ T12] ? pci_address_to_pio+0x40/0x40 [ 68.314909][ T12] pcie_port_device_register (include/linux/pci.h:1882 drivers/pci/pcie/portdrv_core.c:107 drivers/pci/pcie/portdrv_core.c:178 drivers/pci/pcie/portdrv_core.c:353) [ 68.314909][ T12] ? lock_release (kernel/locking/lockdep.c:438 kernel/locking/lockdep.c:5659) [ 68.314909][ T12] ? pcie_port_service_unregister (drivers/pci/pcie/portdrv_core.c:316) [ 68.314909][ T12] ? pcie_portdrv_remove (drivers/pci/pcie/portdrv_pci.c:103) [ 68.314909][ T12] pcie_portdrv_probe (drivers/pci/pcie/portdrv_pci.c:117) [ 68.314909][ T12] ? pcie_portdrv_remove (drivers/pci/pcie/portdrv_pci.c:103) [ 68.314909][ T12] local_pci_probe (drivers/pci/pci-driver.c:323) [ 68.314909][ T12] ? pci_device_shutdown (drivers/pci/pci-driver.c:305) [ 68.314909][ T12] work_for_cpu_fn (kernel/workqueue.c:5194) [ 68.314909][ T12] process_one_work (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:212 include/trace/events/workqueue.h:108 kernel/workqueue.c:2303) [ 68.314909][ T12] ? rcu_read_unlock (include/linux/rcupdate.h:717 (discriminator 5)) [ 68.314909][ T12] ? pwq_dec_nr_in_flight (kernel/workqueue.c:2193) [ 68.314909][ T12] ? rwlock_bug+0xc0/0xc0 [ 68.314909][ T12] worker_thread (include/linux/list.h:284 kernel/workqueue.c:2446) [ 68.314909][ T12] ? process_one_work (kernel/workqueue.c:2388) [ 68.314909][ T12] kthread (kernel/kthread.c:327) [ 68.314909][ T12] ? set_kthread_struct (kernel/kthread.c:272) [ 68.314909][ T12] ret_from_fork (arch/x86/entry/entry_64.S:301) [ 68.314909][ T12] </TASK> [ 68.314909][ T12] [ 68.314909][ T12] Allocated by task 12: [ 68.314909][ T12] kasan_save_stack (mm/kasan/common.c:38) [ 68.314909][ T12] __kasan_kmalloc (mm/kasan/common.c:46 mm/kasan/common.c:434 mm/kasan/common.c:513 mm/kasan/common.c:522) [ 68.314909][ T12] msi_alloc_desc (include/linux/slab.h:590 include/linux/slab.h:724 kernel/irq/msi.c:39) [ 68.314909][ T12] msi_add_msi_desc (kernel/irq/msi.c:76 (discriminator 9)) [ 68.314909][ T12] msi_setup_msi_desc (drivers/pci/msi/msi.c:366) [ 68.314909][ T12] __pci_enable_msi_range (drivers/pci/msi/msi.c:448 drivers/pci/msi/msi.c:905) [ 68.314909][ T12] pci_alloc_irq_vectors_affinity (drivers/pci/msi/msi.c:1029) [ 68.314909][ T12] pcie_port_device_register (include/linux/pci.h:1882 drivers/pci/pcie/portdrv_core.c:107 drivers/pci/pcie/portdrv_core.c:178 drivers/pci/pcie/portdrv_core.c:353) [ 68.314909][ T12] pcie_portdrv_probe (drivers/pci/pcie/portdrv_pci.c:117) [ 68.314909][ T12] local_pci_probe (drivers/pci/pci-driver.c:323) [ 68.314909][ T12] work_for_cpu_fn (kernel/workqueue.c:5194) [ 68.314909][ T12] process_one_work (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:212 include/trace/events/workqueue.h:108 kernel/workqueue.c:2303) [ 68.314909][ T12] worker_thread (include/linux/list.h:284 kernel/workqueue.c:2446) [ 68.314909][ T12] kthread (kernel/kthread.c:327) [ 68.314909][ T12] ret_from_fork (arch/x86/entry/entry_64.S:301) [ 68.314909][ T12] [ 68.314909][ T12] Freed by task 12: [ 68.314909][ T12] kasan_save_stack (mm/kasan/common.c:38) [ 68.314909][ T12] kasan_set_track (mm/kasan/common.c:46) [ 68.314909][ T12] kasan_set_free_info (mm/kasan/generic.c:372) [ 68.314909][ T12] __kasan_slab_free (mm/kasan/common.c:368 mm/kasan/common.c:328 mm/kasan/common.c:374) [ 68.314909][ T12] kfree (mm/slub.c:1749 mm/slub.c:3513 mm/slub.c:4561) [ 68.314909][ T12] msi_free_msi_descs_range (kernel/irq/msi.c:136 (discriminator 2)) [ 68.314909][ T12] msi_domain_alloc_irqs_descs_locked (kernel/irq/msi.c:955) [ 68.314909][ T12] __pci_enable_msi_range (drivers/pci/msi/msi.c:458 drivers/pci/msi/msi.c:905) [ 68.314909][ T12] pci_alloc_irq_vectors_affinity (drivers/pci/msi/msi.c:1029) [ 68.314909][ T12] pcie_port_device_register (include/linux/pci.h:1882 drivers/pci/pcie/portdrv_core.c:107 drivers/pci/pcie/portdrv_core.c:178 drivers/pci/pcie/portdrv_core.c:353) [ 68.314909][ T12] pcie_portdrv_probe (drivers/pci/pcie/portdrv_pci.c:117) [ 68.314909][ T12] local_pci_probe (drivers/pci/pci-driver.c:323) [ 68.314909][ T12] work_for_cpu_fn (kernel/workqueue.c:5194) [ 68.314909][ T12] process_one_work (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:212 include/trace/events/workqueue.h:108 kernel/workqueue.c:2303) [ 68.314909][ T12] worker_thread (include/linux/list.h:284 kernel/workqueue.c:2446) [ 68.314909][ T12] kthread (kernel/kthread.c:327) [ 68.314909][ T12] ret_from_fork (arch/x86/entry/entry_64.S:301) [ 68.314909][ T12] [ 68.314909][ T12] The buggy address belongs to the object at ffff888100063600 [ 68.314909][ T12] which belongs to the cache kmalloc-128 of size 128 [ 68.314909][ T12] The buggy address is located 100 bytes inside of [ 68.314909][ T12] 128-byte region [ffff888100063600, ffff888100063680) [ 68.314909][ T12] The buggy address belongs to the page: [ 68.314909][ T12] page:00000000f9812823 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x100060 [ 68.314909][ T12] head:00000000f9812823 order:2 compound_mapcount:0 compound_pincount:0 [ 68.314909][ T12] flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff) [ 68.314909][ T12] raw: 0017ffffc0010200 0000000000000000 dead000000000122 ffff88810004c8c0 [ 68.314909][ T12] raw: 0000000000000000 0000000080400040 00000001ffffffff 0000000000000000 [ 68.314909][ T12] page dumped because: kasan: bad access detected [ 68.314909][ T12] [ 68.314909][ T12] Memory state around the buggy address: [ 68.314909][ T12] ffff888100063500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc [ 68.314909][ T12] ffff888100063580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 68.314909][ T12] >ffff888100063600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.314909][ T12] ^ [ 68.314909][ T12] ffff888100063680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 68.314909][ T12] ffff888100063700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc [ 68.314909][ T12] ================================================================== [ 68.314909][ T12] Disabling lock debugging due to kernel taint [ 68.906957][ T12] pcieport 0000:00:01.0: PME: Signaling with IRQ 24 [ 68.929322][ T12] pcieport 0000:00:01.0: AER: enabled with IRQ 24 [ 68.951517][ T12] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:02.0/msi_irqs/25' [ 68.962445][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G B 5.16.0-rc5-00094-g43daaa998292 #1 [ 68.963411][ T12] Hardware name: Intel Corp. GROVEPORT/GROVEPORT, BIOS GVPRCRB1.86B.0018.D06.1710190403 10/19/2017 [ 68.963411][ T12] Workqueue: events work_for_cpu_fn To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests sudo bin/lkp install job.yaml # job file is attached in this email bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run sudo bin/lkp run generated-yaml-file # if come across any failure that blocks the test, # please remove ~/.lkp and /lkp dir to run from a clean state. --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang