Hello. Here goes a small shell script to crash a kernel in switchtec.ko's stdev_release. --snip-- #!/bin/bash -x # open cdev exec 3<>/dev/switchtec0 # remove pdev addr=$(basename $(realpath /sys/class/switchtec/switchtec0/../..)) echo 1 > /sys/bus/pci/devices/$addr/remove # close cdev exec 3>&- --snip-- It worked on v5.10. I believe it has been working ever since. The problem is that keeping the stdev pinned past the pci_driver removal will defer the mrpc dma shutdown until way after devres_release_all, which unmapped stdev->mmio_mrpc. Also, stdev->pdev would be a stale pointer by then. Followed-up with a humble proposal how to fix it. Thanks, Daniel Daniel Stodden (1): switchtec: Fix stdev_release crash after suprise device loss. drivers/pci/switch/switchtec.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-) -- 2.41.0
