e7f3187317
Recently, when running './test_progs -j', I occasionally hit the following errors: test_lwt_redirect:PASS:pthread_create 0 nsec test_lwt_redirect_run:FAIL:netns_create unexpected error: 256 (errno 0) #142/2 lwt_redirect/lwt_redirect_normal_nomac:FAIL #142 lwt_redirect:FAIL test_lwt_reroute:PASS:pthread_create 0 nsec test_lwt_reroute_run:FAIL:netns_create unexpected error: 256 (errno 0) test_lwt_reroute:PASS:pthread_join 0 nsec #143/2 lwt_reroute/lwt_reroute_qdisc_dropped:FAIL #143 lwt_reroute:FAIL The netns_create() definition looks like below: #define NETNS "ns_lwt" static inline int netns_create(void) { return system("ip netns add " NETNS); } One possibility is that both lwt_redirect and lwt_reroute create netns with the same name "ns_lwt" which may cause conflict. I tried the following example: $ sudo ip netns add abc $ echo $? 0 $ sudo ip netns add abc Cannot create namespace file "/var/run/netns/abc": File exists $ echo $? 1 $ The return code for above netns_create() is 256. The internet search suggests that the return value for 'ip netns add ns_lwt' is 1, which matches the above 'sudo ip netns add abc' example. This patch tried to use different netns names for two tests to avoid 'ip netns add <name>' failure. I ran './test_progs -j' 10 times and all succeeded with lwt_redirect/lwt_reroute tests. Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Tested-by: Eduard Zingerman <eddyz87@gmail.com> Link: https://lore.kernel.org/bpf/20240205052914.1742687-1-yonghong.song@linux.dev
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.