Re: [linus:master] [selftests] 465b05bae5: kernel-selftests.landlock.audit_test.audit.tsync_override_log_subdomains_off.fail

On Wed, May 13, 2026 at 12:52:35PM +0200, Mickaël Salaün wrote:
(...)

> > > config: x86_64-rhel-9.4-kselftests
> > > compiler: gcc-14
> > > test machine: 16 threads Intel(R) Core(TM) i7-13620H (Raptor Lake) with 32G memory
> > > 
> > > (please refer to attached dmesg/kmsg for entire log/backtrace)
> > > 
> > > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > > the same patch/commit), kindly add following tags
> > > | Reported-by: kernel test robot <[email protected]>
> > > | Closes: https://lore.kernel.org/oe-lkp/[email protected]
> > 
> > I was unable to run the landlock selftests myself, on my machines they are
> > failing at runtime with all kinds of colorful errors. Are the requirements
> > explained somewhere?
> 
> I'm curious about the errors you get.  They are standard kselftests that
> should work following this workflow:
> 
>   make TARGETS=landlock O=build kselftest-gen_tar
> 
> and then running ./build/kselftests/kselftest_install/run_kselftest.sh
> as root in a VM.  The required kernel configuration is listed in
> tools/testing/selftests/landlock/config

So there are two root issues I ran into:

1) The tests can not be executed from virtiofs (as set up by virtme-ng):

 #  RUN           audit.layers ...
# audit_test.c:52:layers:Expected 0 (0) <= self->audit_fd (-13)
# audit_test.c:61:layers:Failed to initialize audit: Permission denied
# layers: Test failed
#          FAIL  audit.layers
not ok 1 audit.layers

(The same for all other testcases)

2) $PWD needs to be the test binary directory for "./wait-pipe-sandbox" to work.

> To make it easier, we wrote a wrapper to test everything with UML:
> https://github.com/landlock-lsm/landlock-test-tools (see check-linux.sh)
> 
> > 
> > > # #  RUN           audit.tsync_override_log_subdomains_off ...
> > > # # audit_test.c:591:tsync_override_log_subdomains_off:Expected 0 (0) == matches_log_signal(_metadata, self->audit_fd, child_data.parent_pid, NULL) (-11)
> > 
> > This error number means "EAGAIN 11 Resource temporarily unavailable",
> > so it could be a temporary error.
> 
> Yes, the test is flaky under pressure.
> 
> > 
> > Can you reproduce this issue? Is it really dependent on my patch as
> > blamed above? If so, does the selftest rely on the previous, incorrect order?
> 
> I don't think it directly depends on your patch but it might be a side
> effect.  Anyway, I've been working on fixing this kind of issue and just
> sent a fix:
> https://lore.kernel.org/r/[email protected]

Thanks, unfortunately I can't validate that it will fix the issue at hand.


Thomas