[Bug 207855] New: arcconf host reset causes kernel panic -> driver crash?

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=207855

            Bug ID: 207855
           Summary: arcconf host reset causes kernel panic -> driver
                    crash?
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 5.6.13
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: SCSI
          Assignee: linux-scsi@vger.kernel.org
          Reporter: janpieter.sollie@edpnet.be
        Regression: No

Created attachment 289227
  --> https://bugzilla.kernel.org/attachment.cgi?id=289227&action=edit
last dmesg captured

When performing a arcconf operation (assign hot-spare) on a adaptec 72405 SAS
controller, the program crashes with the error "segmentation fault", but
apparently, the driver is not too happy with it either: it becomes
unresponsive, and makes it impossible to access scsi devices on the SAS
controller.
Additional tricks to perform a PCI level reset ultimately lead to a kernel
panic:
linuxserver# echo 1 > /sys/bus/pci/devices/0000\:04\:00.0/reset
(wait a minute)
linuxserver# echo 1 > /sys/bus/pci/rescan
(wait a minute)
linuxserver# umount /data/* (where all SAS devices are mounted)
(hangs indefinitely) 
linuxserver# echo auto > /sys/bus/pci/devices/0000\:04\:00.0/power/control
linuxserver# echo "0000:04:00.0" > /sys/bus/pci/drivers/aacraid/unbind
--PANIC--

I haven't been able to C/P the panic output yet, working on a kexec kernel or
crash dump.
The root directory is NOT one of the SAS devices, it is on a generic SATA
controller

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