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This is a long-standing issue that uninterruptible sleep in fanotify could make system hibernation fail if the usperspace server gets frozen before the process waiting for the response (as reported e.g. [1][2]). A few years ago, there was an attempt to switch to interruptible sleep while waiting [3], but that would lead to EINTR returns from open(2) and break userspace [4], so it's been changed to only killable [5]. And the core freezer logic had been rewritten [6][7] in v6.1, allowing freezing in uninterrupted sleep, so we can solve this problem now. [1] https://lore.kernel.org/lkml/1518774280-38090-1-git-send-email-t.vivek@samsung.com/ [2] https://lore.kernel.org/lkml/c1bb16b7-9eee-9cea-2c96-a512d8b3b9c7@nwra.com/ [3] https://lore.kernel.org/linux-fsdevel/20190213145443.26836-1-jack@suse.cz/ [4] https://lore.kernel.org/linux-fsdevel/d0031e3a-f050-0832-fa59-928a80ffd44b@nwra.com/ [5] https://lore.kernel.org/linux-fsdevel/20190221105558.GA20921@quack2.suse.cz/ [6] https://lore.kernel.org/lkml/20220822114649.055452969@infradead.org/ [7] https://lore.kernel.org/lkml/20230908-avoid-spurious-freezer-wakeups-v4-0-6155aa3dafae@quicinc.com/ Signed-off-by: Winston Wen <wentao@uniontech.com> Signed-off-by: Jan Kara <jack@suse.cz> Message-Id: <BD33543C483B89AB+20240305061804.1186796-1-wentao@uniontech.com>
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.