linux-kernel - Re: LTP: list of failures on 32bit and compat mode

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Date:   Tue, 11 Apr 2023 22:15:36 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Petr Vorel <pvorel@...e.cz>
Cc:     Arnd Bergmann <arnd@...db.de>,
        open list <linux-kernel@...r.kernel.org>,
        LTP List <ltp@...ts.linux.it>, llvm@...ts.linux.dev,
        chrubis <chrubis@...e.cz>, Nathan Chancellor <nathan@...nel.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Daniel Díaz <daniel.diaz@...aro.org>,
        Benjamin Copeland <ben.copeland@...aro.org>,
        Tudor Cretu <tudor.cretu@....com>
Subject: Re: LTP: list of failures on 32bit and compat mode

On Thu, 6 Apr 2023 at 16:26, Petr Vorel <pvorel@...e.cz> wrote:
>
> > On Thu, Apr 6, 2023, at 11:11, Naresh Kamboju wrote:
> > > Following LTP syscalls failed on the i386 and arm environments with
> > > Linux next / mainline kernels. The userspace is coming from Open
> > > Embedded kirkstone.
>
> > Thanks for the report and summary! I went through the list and found
> > that most if not all of the bugs looks like incompatibilities
> > with musl, not with 32-bit. It's probably not well tested with
> > musl.
>
> > Can you try again with glibc and see if there are any remaining
> > issues then? LTP should probably be fixed to work with both, but
> > if nobody has done that so far, it's likely that this has come
> > up in the past but ran into problems upstreaming the fixes.
>
> > > Anyone seeing this problem on 32-bit i386 or arm ?
> > > You get to see "segfault" in the following logs that have been noticed
> > > on i386 only.
>
> > > This is not a new problem. We have been noticing these failures for a
> > > really long time.
> > > Would it be worth investigating the reason for failures on 32bit architectures ?
>
> > > Test logs,
> > > -----
> > > [    0.000000] Linux version 6.3.0-rc5-next-20230406 (tuxmake@...make)
> > > (i686-linux-gnu-gcc (Debian 11.3.0-11) 11.3.0, GNU ld (GNU Binutils
> > > for Debian) 2.40) #1 SMP PREEMPT_DYNAMIC @1680759389
>
>
> > > Test environment: i386
> > > Suite: ltp-syscalls
> > > Toolchain: gcc-11
>
>
> > > fstatfs02
> > > fstatfs02    1  TPASS  :  expected failure - errno = 9 : Bad file descriptor
> > > fstatfs02    2  TBROK  :  tst_sig.c:232: unexpected signal SIGSEGV(11)
> > > received (pid = 17841).
> > > fstatfs02    3  TBROK  :  tst_sig.c:232: Remaining cases broken
> This is IMHO using the old LTP API.
> testcases/kernel/syscalls/fstatfs/fstatfs02.c was converted to new LTP API in
> 5a8f89d35 ("syscalls/statfs02, fstatfs02: Convert to new API"), which was
> released in 20220930. There is already newer release 20230127.
> Generally it's safer to test mainline kernel with LTP master,
> but this fix has already been in the latest LTP release 20230127.
> And this error has been later fixed with
> 492542072 ("syscalls/statfs02, fstatfs02: Accept segfault instead of EFAULT")

Thanks for insite about the failed test investigations.

>
> @Naresh which LTP do you use for testing? It must be some older LTP :(.

Our build system started running LTP version 20230127.
I will keep you posted with the latest findings.

- Naresh