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Christian Brauner <brauner@kernel.org> says: In a prior patch series we tried to cleanly differentiate between: (1) The task has already been reaped. (2) The caller requested a pidfd for a thread-group leader but the pid actually references a struct pid that isn't used as a thread-group leader. as this was causing issues for non-threaded workloads. But there's cases where the current simple logic is wrong. Specifically, if the pid was a leader pid and the check races with __unhash_process(). Stabilize this by using the pidfd waitqueue lock. * patches from https://lore.kernel.org/20250411-work-pidfs-enoent-v2-0-60b2d3bb545f@kernel.org: pidfs: ensure consistent ENOENT/ESRCH reporting exit: move wake_up_all() pidfd waiters into __unhash_process() Link: https://lore.kernel.org/20250411-work-pidfs-enoent-v2-0-60b2d3bb545f@kernel.org Signed-off-by: Christian Brauner <brauner@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 reStructuredText 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.