Re: [LTP] [PATCH v2 8/8] Rewrite userns08.c using new LTP API

[Petr Vorel <pvorel@suse.cz>]

> Hi!
> > ./userns08 -i50
> > tst_kconfig.c:82: TINFO: Parsing kernel config '/proc/config.gz'
> > tst_test.c:1456: TINFO: Timeout per run is 0h 05m 00s

> > userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> > userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> > userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> > userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> > userns08.c:65: TPASS: Denied write access to ./restricted : EACCES (13)
> > userns08.c:36: TBROK: clone3 failed: ENOSPC (28)

> > Something needs to be closed after each run.

> ENOSPC means that we created too many user namespaces. The problem is
> likely that we are creating the namespaces faster than they are being
> asynchronously cleaned up in the kernel. Adding sleep(1) to the
> clone_newuser() function gives kernel enough time to clean the
> namespaces and the test works with any -i. Also note that we get the
> exact same failure if we execute the test a few times in a row, i.e.

> for i in `seq 10`; do
> 	./userns08
> done
+1

> The original test fails in the same way, so while it should be fixed,
> it's not really reason to block this patchset.
Agree (I forget to write I suspected the problem wasn't new in this patchset).

> And the only correct fix would be retrying the clone() on ENOSPC in the
> SAFE_CLONE().
+1. I suppose Andrea will have look into it (otherwise I'll do it).

Kind regards,
Petr

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