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Brandon Kammerdiener says: ==================== This patchset fixes an endless loop condition that can occur in bpf_for_each_hash_elem, causing the core to softlock. My understanding is that a combination of RCU list deletion and insertion introduces the new element after the iteration cursor and that there is a chance that an RCU reader may in fact use this new element in iteration. The patch uses a _safe variant of the macro which gets the next element to iterate before executing the loop body for the current element. I have also added a subtest in the for_each selftest that can trigger this condition without the fix. Changes since v2: - Renaming and additional checks in selftests/bpf/prog_tests/for_each.c Changes since v1: - Added missing Signed-off-by lines to both patches ==================== Acked-by: Hou Tao <houtao1@huawei.com> Link: https://patch.msgid.link/20250424153246.141677-1-brandon.kammerdiener@intel.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.