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Linux kernel source tree
7a95a05f15
Brendan points out that defrag_mode doesn't properly clear
ALLOC_NOFRAGMENT on its last-ditch attempt to allocate. But looking
closer, the problem is actually more severe: it doesn't actually *check*
whether it's already retried, and keeps looping. This means the OOM path
is never taken, and the thread can loop indefinitely.
This is verified with an intentional OOM test on defrag_mode=1, which
results in the machine hanging. After this patch, it triggers the OOM
kill reliably and recovers.
Clear ALLOC_NOFRAGMENT properly, and only retry once.
Link: https://lkml.kernel.org/r/20250401041231.GA2117727@cmpxchg.org
Fixes:
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||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.