fbaf59a9f5
In s390, CI reported that the sock_iter_batch selftest hits this error very often: 2024-01-26T16:56:49.3091804Z Bind /proc/self/ns/net -> /run/netns/sock_iter_batch_netns failed: No such file or directory 2024-01-26T16:56:49.3149524Z Cannot remove namespace file "/run/netns/sock_iter_batch_netns": No such file or directory 2024-01-26T16:56:49.3772213Z test_sock_iter_batch:FAIL:ip netns add sock_iter_batch_netns unexpected error: 256 (errno 0) It happens very often in s390 but Manu also noticed it happens very sparsely in other arch also. It turns out the default dash shell does not recognize "&>" as a redirection operator, so the command went to the background. In the sock_iter_batch selftest, the "ip netns delete" went into background and then race with the following "ip netns add" command. This patch replaces the "&> /dev/null" usage with ">/dev/null 2>&1" and does this redirection in the SYS_NOFAIL macro instead of doing it individually by its caller. The SYS_NOFAIL callers do not care about failure, so it is no harm to do this redirection even if some of the existing callers do not redirect to /dev/null now. It touches different test files, so I skipped the Fixes tags in this patch. Some of the changed tests do not use "&>" but they use the SYS_NOFAIL, so these tests are also changed to avoid doing its own redirection because SYS_NOFAIL does it internally now. Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://lore.kernel.org/r/20240127025017.950825-1-martin.lau@linux.dev 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 Restructured Text 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.