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net/rds/test.py sees a segfault in tcpdump when executed through the ksft runner. [ 21.903713] tcpdump[1469]: segfault at 0 ip 000072100e99126d sp 00007ffccf740fd0 error 4 [ 21.903721] in libc.so.6[16a26d,7798b149a000+188000] [ 21.905074] in libc.so.6[16a26d,72100e84f000+188000] likely on CPU 5 (core 5, socket 0) [ 21.905084] Code: 00 0f 85 a0 00 00 00 48 83 c4 38 89 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 48 8b 05 91 8b 09 00 8b 4d ac 64 89 08 <41> 0f b6 07 83 e8 2b a8 fd 0f 84 54 ff ff ff 49 8b 36 4c 89 ff e8 [ 21.906760] likely on CPU 9 (core 9, socket 0) [ 21.913469] Code: 00 0f 85 a0 00 00 00 48 83 c4 38 89 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 48 8b 05 91 8b 09 00 8b 4d ac 64 89 08 <41> 0f b6 07 83 e8 2b a8 fd 0f 84 54 ff ff ff 49 8b 36 4c 89 ff e8 The os.fork() call creates extra complexity because it forks the entire process including the python interpreter. ip() then calls cmd() which creates a subprocess.Popen. We can avoid the extra layering by simply calling subprocess.Popen directly. Track the process handles directly and terminate them at cleanup rather than relying on killall. Further tcpdump's -Z flag attempts to change savefile ownership, which is not supported by the 9p protocol. Fix this by writing pcap captures to "/tmp" during the test and move them to the log directory after tcpdump exits. Signed-off-by: Allison Henderson <achender@kernel.org> Link: https://patch.msgid.link/20260308055835.1338257-4-achender@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
RDS self-tests
==============
These scripts provide a coverage test for RDS-TCP by creating two
network namespaces and running rds packets between them. A loopback
network is provisioned with optional probability of packet loss or
corruption. A workload of 50000 hashes, each 64 characters in size,
are passed over an RDS socket on this test network. A passing test means
the RDS-TCP stack was able to recover properly. The provided config.sh
can be used to compile the kernel with the necessary gcov options. The
kernel may optionally be configured to omit the coverage report as well.
USAGE:
run.sh [-d logdir] [-l packet_loss] [-c packet_corruption]
[-u packet_duplcate]
OPTIONS:
-d Log directory. Defaults to tools/testing/selftests/net/rds/rds_logs
-l Simulates a percentage of packet loss
-c Simulates a percentage of packet corruption
-u Simulates a percentage of packet duplication.
EXAMPLE:
# Create a suitable gcov enabled .config
tools/testing/selftests/net/rds/config.sh -g
# Alternatly create a gcov disabled .config
tools/testing/selftests/net/rds/config.sh
# build the kernel
vng --build --config tools/testing/selftests/net/config
# launch the tests in a VM
vng -v --rwdir ./ --run . --user root --cpus 4 -- \
"export PYTHONPATH=tools/testing/selftests/net/; tools/testing/selftests/net/rds/run.sh"
An HTML coverage report will be output in tools/testing/selftests/net/rds/rds_logs/coverage/.