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abdfd4948e
task_pid_vnr(another_task) will crash if the caller was already reaped. The pid_alive(current) check can't really help, the parent/debugger can call release_task() right after this check. This also means that even task_ppid_nr_ns(current, NULL) is not safe, pid_alive() only ensures that it is safe to dereference ->real_parent. Change __task_pid_nr_ns() to ensure ns != NULL. Originally-by: 高翔 <gaoxiang17@xiaomi.com> Link: https://lore.kernel.org/all/20250802022123.3536934-1-gxxa03070307@gmail.com/ Signed-off-by: Oleg Nesterov <oleg@redhat.com> Link: https://lore.kernel.org/20250810173604.GA19991@redhat.com 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.