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This reverts commit4a8f635a60. Althought get_pid_task() internally already calls rcu_read_lock() and rcu_read_unlock(), the find_vpid() was not. The documentation for find_vpid() clearly states: "Must be called with the tasklist_lock or rcu_read_lock() held." Add proper rcu_read_lock/unlock() to protect the find_vpid(). Fixes:4a8f635a60("bpf: remove unnecessary rcu_read_{lock,unlock}() in multi-uprobe attach logic") Reported-by: Xuewen Yan <xuewen.yan@unisoc.com> Signed-off-by: Di Shen <di.shen@unisoc.com> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20250520054943.5002-1-xuewen.yan@unisoc.com Signed-off-by: Alexei Starovoitov <ast@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.