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No upstream commit exists: the problem addressed here is that 'commit75309018a2("s390: add support for TIF_NOTIFY_SIGNAL")' was backported to 5.10. This commit is broken, but nobody noticed upstream, since shortly after s390 converted to generic entry with 'commit56e62a7370("s390: convert to generic entry")', which implicitly fixed the problem outlined below. Thread flag is set to TIF_NOTIFY_SIGNAL for io_uring work. The io work user or syscall calls do_signal when either one of the TIF_SIGPENDING or TIF_NOTIFY_SIGNAL flag is set. However, do_signal does consider only TIF_SIGPENDING signal and ignores TIF_NOTIFY_SIGNAL condition. This means get_signal is never invoked for TIF_NOTIFY_SIGNAL and hence the flag is not cleared, which results in an endless do_signal loop. Reference: 'commit788d082426("io_uring: import 5.15-stable io_uring")' Fixes:75309018a2("s390: add support for TIF_NOTIFY_SIGNAL") Cc: stable@vger.kernel.org # 5.10.162 Acked-by: Heiko Carstens <hca@linux.ibm.com> Acked-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.