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[ Upstream commit 2331ce6126be8864b39490e705286b66e2344aac ] Userspace can currently write to sysfs to transition sdev_state to RUNNING or OFFLINE from any source state. This causes issues because proper transitioning out of some states involves steps besides just changing sdev_state, so allowing userspace to change sdev_state regardless of the source state can result in inconsistencies; e.g. with ISCSI we can end up with sdev_state == SDEV_RUNNING while the device queue is quiesced. Any task attempting I/O on the device will then hang, and in more recent kernels, iscsid will hang as well. More detail about this bug is provided in my first attempt: https://groups.google.com/g/open-iscsi/c/PNKca4HgPDs/m/CXaDkntOAQAJ Link: https://lore.kernel.org/r/20220924000241.2967323-1-ushankar@purestorage.com Signed-off-by: Uday Shankar <ushankar@purestorage.com> Suggested-by: Mike Christie <michael.christie@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.