[LTP] [PATCH v4] mmap22.c: Test for new MAP_DROPPABLE flag for mmap

[Jan Stancek]

On Tue, May 13, 2025 at 5:44 AM Wei Gao <wegao@suse.com> wrote:
>
> On Mon, May 12, 2025 at 10:43:55AM +0200, Jan Stancek wrote:
> > Is anyone else seeing this test failing on recent 6.15-rc5 kernels?
> >
> > ==== mmap22 ====
> > command: mmap22
> > tst_tmpdir.c:316: TINFO: Using /tmp/LTP_mmazCULNN as tmpdir (tmpfs filesystem)
> > tst_test.c:1938: TINFO: LTP version: 20250130-253-g4a0e3a8fa
> > tst_test.c:1942: TINFO: Tested kernel:
> > 6.15.0-0.rc5.250509g9c69f8884904.47.eln148.x86_64 #1 SMP
> > PREEMPT_DYNAMIC Fri May  9 15:17:31 UTC 2025 x86_64
> > tst_kconfig.c:88: TINFO: Parsing kernel config
> > '/lib/modules/6.15.0-0.rc5.250509g9c69f8884904.47.eln148.x86_64/build/.config'
> > tst_test.c:1758: TINFO: Overall timeout per run is 0h 05m 54s
> > mmap22.c:55: TFAIL: MAP_DROPPABLE did not drop memory within the timeout period.
> >
>
> I have tested rc5/6 and both give pass result.

I do see it fail almost daily on multiple arches (VMs and baremetal),
maybe some difference in our config.

command: mmap22
tst_tmpdir.c:316: TINFO: Using /tmp/LTP_mmaYU95zb as tmpdir (tmpfs filesystem)
tst_test.c:1941: TINFO: LTP version: 20250130-256-gb987b8ac5
tst_test.c:1945: TINFO: Tested kernel: 6.15.0-0.rc6.49.eln148.x86_64
#1 SMP PREEMPT_DYNAMIC Tue May 13 14:30:53 UTC 2025 x86_64
tst_kconfig.c:88: TINFO: Parsing kernel config
'/lib/modules/6.15.0-0.rc6.49.eln148.x86_64/build/.config'
tst_test.c:1761: TINFO: Overall timeout per run is 0h 05m 54s
mmap22.c:55: TFAIL: MAP_DROPPABLE did not drop memory within the timeout period.


>
> uname  -r
> 6.15.0-rc6-g627277ba7c23
>  ./mmap22
> tst_tmpdir.c:316: TINFO: Using /tmp/LTP_mmaLHJK4T as tmpdir (tmpfs filesystem)
> tst_test.c:1941: TINFO: LTP version: 20250130-256-gb987b8ac5
> tst_test.c:1945: TINFO: Tested kernel: 6.15.0-rc6-g627277ba7c23 #3 SMP PREEMPT_DYNAMIC Tue May 13 11:15:39 EDT 2025 x86_64
> tst_kconfig.c:71: TINFO: Couldn't locate kernel config!
> tst_test.c:1761: TINFO: Overall timeout per run is 0h 01m 00s
> mmap22.c:59: TPASS: MAP_DROPPABLE test pass.
>
> Summary:
> passed   1
> failed   0
> broken   0
> skipped  0
> warnings 0
>
>
>
> uname  -r
> 6.15.0-rc5
>  ./mmap22
> tst_tmpdir.c:316: TINFO: Using /tmp/LTP_mmauLlsmi as tmpdir (tmpfs filesystem)
> tst_test.c:1941: TINFO: LTP version: 20250130-256-gb987b8ac5
> tst_test.c:1945: TINFO: Tested kernel: 6.15.0-rc5 #4 SMP PREEMPT_DYNAMIC Tue May 13 11:38:14 EDT 2025 x86_64
> tst_kconfig.c:71: TINFO: Couldn't locate kernel config!
> tst_test.c:1761: TINFO: Overall timeout per run is 0h 01m 00s
> mmap22.c:59: TPASS: MAP_DROPPABLE test pass.
>
>
> >
> >
> > On Wed, May 7, 2025 at 5:25 PM Cyril Hrubis <chrubis@suse.cz> wrote:
> > >
> > > Hi!
> > > Pushed with a minor change, thanks.
> > >
> > > We should check if the addr is valid before we attemp to unmap it in the
> > > setup() so I've added:
> > >
> > > diff --git a/testcases/kernel/syscalls/mmap/mmap22.c b/testcases/kernel/syscalls/mmap/mmap22.c
> > > index bfef559e4..0e589dfab 100644
> > > --- a/testcases/kernel/syscalls/mmap/mmap22.c
> > > +++ b/testcases/kernel/syscalls/mmap/mmap22.c
> > > @@ -72,8 +72,13 @@ static void setup(void)
> > >  {
> > >         void *addr = mmap(0, 1, PROT_READ | PROT_WRITE,
> > >                         MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0);
> > > +
> > >         if (addr == MAP_FAILED && errno == EINVAL)
> > > -               tst_brk(TCONF, "MAP_DROPPABLE not support");
> > > +               tst_brk(TCONF, "MAP_DROPPABLE not supported");
> > > +
> > > +       if (addr == MAP_FAILED)
> > > +               tst_brk(TBROK | TERRNO, "mmap() MAP_DROPPABLE failed");
> > > +
> > >         SAFE_MUNMAP(addr, 1);
> > >  }
> > >
> > >
> > > --
> > > Cyril Hrubis
> > > chrubis@suse.cz
> > >
> > > --
> > > Mailing list info: https://lists.linux.it/listinfo/ltp
> > >
> >
>