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As a result, the callback (req notifier) can be never unregistered, and the corresponding descriptor (vfio_req_intr_handle.fd) can be never closed. The kernel will continuously try to notify the user space using req notifier, but as the device is already removed, in this case it even cannot find a bus for that device, the log is full of messages "EAL: Cannot find bus for device (XX:XX.X)" v5: Re-spin with windows update and 21.05 edition v4: * Typo spelling in commit message v3: * Subject line reworded v2: * Use only for pci-vfio in pci_vfio_disable_notifier() Renata Saiakhova (1): eal/interrupts: add synchronous wrapper around unregister drivers/bus/pci/linux/pci_vfio.c | 2 +- lib/librte_eal/freebsd/eal_interrupts.c | 12 ++++++++++++ lib/librte_eal/include/rte_interrupts.h | 25 +++++++++++++++++++++++++ lib/librte_eal/linux/eal_interrupts.c | 12 ++++++++++++ lib/librte_eal/version.map | 1 + lib/librte_eal/windows/eal_interrupts.c | 8 ++++++++ 6 files changed, 59 insertions(+), 1 deletion(-) -- 2.17.2