----- Original Message ----- > On Mon, Nov 04, 2019 at 08:35:51AM -0500, Jan Stancek wrote: > > > > > > ----- Original Message ----- > > > > > > Hello, > > > > > > We ran automated tests on a recent commit from this kernel tree: > > > > > > Kernel repo: > > > git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git > > > Commit: dfe283e9fdac - Linux 5.3.9-rc1 > > > > > > The results of these automated tests are provided below. > > > > > > Overall result: FAILED (see details below) > > > Merge: OK > > > Compile: OK > > > Tests: FAILED > > > > > > All kernel binaries, config files, and logs are available for download > > > here: > > > > > > https://artifacts.cki-project.org/pipelines/262380 > > > > > > One or more kernel tests failed: > > > > > > x86_64: > > > ❌ LTP lite > > > > > > > Not a 5.3 -stable regression. > > > > Failure comes from test that sanity checks all /proc files by doing > > 1k read from each. There are couple issues it hits wrt. snd_hda_*. > > > > Example reproducer: > > dd if=/sys/kernel/debug/regmap/hdaudioC0D3-hdaudio/access of=out.txt > > count=1 bs=1024 iflag=nonblock > > That's not a proc file :) Right. It's same test that's used for /proc too. > > > It's slow and triggers soft lockups [1]. And it also requires lot > > of memory, triggering OOMs on smaller VMs: > > 0x0000000024f0437b-0x000000001a32b1c8 1073745920 seq_read+0x131/0x400 > > pages=262144 vmalloc vpages N0=262144 > > > > I'm leaning towards skipping all regmap entries in this test. > > Comments are welcomed. > > Randomly poking around in debugfs is a sure way to cause crashes and > major problems. Also, debugfs files are NOT stable and only for > debugging and should never be enabled on "real" systems. > > So what exactly is the test trying to do here? It's (unprivileged) user trying to open/read anything it can (/proc, /sys) to see if that triggers anything bad. It can run as privileged user too, which was the case above. [1] https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/fs/read_all/read_all.c
