Hi - I noticed the kselftest target in the kernel Makefile and decided to try it out of curiosity: afustini@lappy486:~/dev/linux/lappy486/git/kernels/mainline$ sudo make kselftest Has anyone run kselftest successfully? I ran into an error that I'm trying to figure out: == Testing sysctl behavior against /proc/sys/vm/swappiness == Writing test file ... ok Checking sysctl is not set to test value ... ok Writing sysctl from shell ... ok Resetting sysctl to original value ... ok Writing entire sysctl in single write ... ok Writing middle of sysctl after synchronized seek ... FAIL Writing beyond end of sysctl ... FAIL Writing sysctl with multiple long writes ... ok make[2]: *** [test_num] Error 1 ./fw_filesystem.sh: timeout works ./fw_filesystem.sh: filesystem loading works fw_filesystem: ok ./fw_userhelper.sh: timeout works ./fw_userhelper.sh: firmware interface never appeared fw_userhelper: [FAIL] make[2]: *** [fw_userhelper] Error 1 make[1]: *** [run_tests] Error 2 make: *** [kselftest] Error 2 I'm running kernel that I compiled from linus's tree 2 days ago. After encountering the error, I turned on all the testing config options I could find under the kernel hacking category. However, I encountered the same kselftest error with the newly built kernel: Linux lappy486 3.17.0-lappy486-00040-gff0c57a-dirty #5 SMP PREEMPT Thu Aug 28 05:08:04 CDT 2014 x86_64 x86_64 x86_64 GNU/Linux Log files for reference: make-kselftest-3.17.0-lappy486-00040-gff0c57a-dirty.log: https://gist.github.com/pdp7/79d511ddf30fa8d0dfee dmesg-3.17.0-lappy486-00040-gff0c57a-dirty.log: https://gist.github.com/pdp7/ea3f86dd7dc994189c14 kernel-config-3.17.0-lappy486-00040-gff0c57a-dirty.log: https://gist.github.com/pdp7/07315ac2aba2ab4c48da lsmod-3.17.0-lappy486-00040-gff0c57a-dirty.log: https://gist.github.com/pdp7/c6db7271345afc8a6868 lib-modules-3.17.0-lappy486-00040-gff0c57a-dirty.log: https://gist.github.com/pdp7/a297c5aa246cd2b1ac9f find-sys-fs-3.17.0-lappy486-00040-gff0c57a-dirty.log: https://gist.github.com/pdp7/9238072c1630e0995749 git-status-3.17.0-lappy486-00040-gff0c57a-dirty.log: https://gist.github.com/pdp7/c300ced047d1fa7fc696 git-diff-3.17.0-lappy486-00040-gff0c57a-dirty.log: https://gist.github.com/pdp7/686ab164c55a25fcb5f8 thanks, drew