Hello,

after upgrading some servers from 4.9 to a kernel > 4.11 i saw a
regression where i cannot boot into the os.

The kernel is crashing in the isci (NOT iscsi) driver in task abort.

Message:
Unable to handle kernel NULL pointer dereference at isci_task_abort_task

git bisect detected the following offending commit:
909657615d9b3ce709be4fd95b9a9e8c8c7c2be6 is the first bad commit
commit 909657615d9b3ce709be4fd95b9a9e8c8c7c2be6
Author: Christoph Hellwig <h...@lst.de>
Date: Thu Apr 6 15:36:32 2017 +0200

    scsi: libsas: allow async aborts

    We now first try to call ->eh_abort_handler from a work queue, but
libsas
    was always failing that for no good reason. Allow async aborts.

    Reviewed-by: Johannes Thumshirn <j...@kernel.org>
    Reviewed-by: Hannes Reinecke <h...@suse.de>
    Signed-off-by: Christoph Hellwig <h...@lst.de>
    Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com>

:040000 040000 b15f1eb57bf74667aefb7a304fa09bf58386eaf2
64df540499763db44c7e1b6ec9a55ffa9b2ebedc M drivers

i can't grab much information except for a photo as the boot process is
before netconsole or others can jump in.

The caller of isci_task_abort_task seems to be sas_eh_abort_handler.

Thanks!

Greets,
Stefan

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