3466abafa9
[ Upstream commit 7fea700e04bd3f424c2d836e98425782f97b494e ] kernel_wait4() doesn't sleep and returns -EINTR if there is no eligible child and signal_pending() is true. That is why zap_pid_ns_processes() clears TIF_SIGPENDING but this is not enough, it should also clear TIF_NOTIFY_SIGNAL to make signal_pending() return false and avoid a busy-wait loop. Link: https://lkml.kernel.org/r/20240608120616.GB7947@redhat.com Fixes: 12db8b690010 ("entry: Add support for TIF_NOTIFY_SIGNAL") Signed-off-by: Oleg Nesterov <oleg@redhat.com> Reported-by: Rachel Menge <rachelmenge@linux.microsoft.com> Closes: https://lore.kernel.org/all/1386cd49-36d0-4a5c-85e9-bc42056a5a38@linux.microsoft.com/ Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Tested-by: Wei Fu <fuweid89@gmail.com> Reviewed-by: Jens Axboe <axboe@kernel.dk> Cc: Allen Pais <apais@linux.microsoft.com> Cc: Christian Brauner <brauner@kernel.org> Cc: Frederic Weisbecker <frederic@kernel.org> Cc: Joel Fernandes (Google) <joel@joelfernandes.org> Cc: Joel Granados <j.granados@samsung.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Lai Jiangshan <jiangshanlai@gmail.com> Cc: Mateusz Guzik <mjguzik@gmail.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Mike Christie <michael.christie@oracle.com> Cc: Neeraj Upadhyay <neeraj.upadhyay@kernel.org> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Steven Rostedt (Google) <rostedt@goodmis.org> Cc: Zqiang <qiang.zhang1211@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Sasha Levin <sashal@kernel.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.