Dear PCI maintainers: I'm having a deadlock issue, somewhat similar to a previous one https://lore.kernel.org/linux-pci/CS1PR8401MB0728FC6FDAB8A35C22BD90EC95F10@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/#t，; but my kernel (6.6.40) already included the fix f5eff55. Here is my test process, I’m running kernel with 6.6.40 and SPDK v22.05: 1. SPDK use vfio driver to takeover two nvme disks, running some io in nvme. 2. pull out two nvme disks 3. Try to kill -9 SPDK process. Then deadlock issue happened. For now I can 100% reproduce this problem. I’m not an export in PCI, but I did a brief analysis: irq 149 thread take pci_rescan_remove_lock mutex lock, and wait for SPDK to release vfio. irq 148 thread take reset_lock of ctrl A, and wait for psi_rescan_remove_lock SPDK process try to release vfio driver, but wait for reset_lock of ctrl A. irq/149-pciehp stack, cat /proc/514/stack, [<0>] pciehp_unconfigure_device+0x48/0x160 // wait for pci_rescan_remove_lock [<0>] pciehp_disable_slot+0x6b/0x130 // hold reset_lock of ctrl A [<0>] pciehp_handle_presence_or_link_change+0x7d/0x4d0 [<0>] pciehp_ist+0x236/0x260 [<0>] irq_thread_fn+0x1b/0x60 [<0>] irq_thread+0xed/0x190 [<0>] kthread+0xe4/0x110 [<0>] ret_from_fork+0x2d/0x50 [<0>] ret_from_fork_asm+0x11/0x20 irq/148-pciehp stack, cat /proc/513/stack [<0>] vfio_unregister_group_dev+0x97/0xe0 [vfio] //wait for [<0>] vfio_pci_core_unregister_device+0x19/0x80 [vfio_pci_core] [<0>] vfio_pci_remove+0x15/0x20 [vfio_pci] [<0>] pci_device_remove+0x39/0xb0 [<0>] device_release_driver_internal+0xad/0x120 [<0>] pci_stop_bus_device+0x5d/0x80 [<0>] pci_stop_and_remove_bus_device+0xe/0x20 [<0>] pciehp_unconfigure_device+0x91/0x160 //hold pci_rescan_remove_lock, release reset_lock of ctrl B [<0>] pciehp_disable_slot+0x6b/0x130 [<0>] pciehp_handle_presence_or_link_change+0x7d/0x4d0 [<0>] pciehp_ist+0x236/0x260 //hold reset_lock of ctrl B [<0>] irq_thread_fn+0x1b/0x60 [<0>] irq_thread+0xed/0x190 [<0>] kthread+0xe4/0x110 [<0>] ret_from_fork+0x2d/0x50 [<0>] ret_from_fork_asm+0x11/0x20 SPDK stack, cat /proc/166634/task/167181/stack [<0>] down_write_nested+0x1b7/0x1c0 //wait for reset_lock of ctrl A. [<0>] pciehp_reset_slot+0x58/0x160 [<0>] pci_reset_hotplug_slot+0x3b/0x60 [<0>] pci_reset_bus_function+0x3b/0xb0 [<0>] __pci_reset_function_locked+0x3e/0x60 [<0>] vfio_pci_core_disable+0x3ce/0x400 [vfio_pci_core] [<0>] vfio_pci_core_close_device+0x67/0xc0 [vfio_pci_core] [<0>] vfio_df_close+0x79/0xd0 [vfio] [<0>] vfio_df_group_close+0x36/0x70 [vfio] [<0>] vfio_device_fops_release+0x20/0x40 [vfio] [<0>] __fput+0xec/0x290 [<0>] task_work_run+0x61/0x90 [<0>] do_exit+0x39c/0xc40 [<0>] do_group_exit+0x33/0xa0 [<0>] get_signal+0xd84/0xd90 [<0>] arch_do_signal_or_restart+0x2a/0x260 [<0>] exit_to_user_mode_prepare+0x1c7/0x240 [<0>] syscall_exit_to_user_mode+0x2a/0x60 [<0>] do_syscall_64+0x3e/0x90
