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From: Florian Weimer <fweimer@redhat.com>
To: Vineet Gupta via Libc-alpha <libc-alpha@sourceware.org>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>,
	arcml <linux-snps-arc@lists.infradead.org>
Subject: Re: ARC testsuite regressions (was Re: [PATCH v7.2 07/13] ARC: Linux Syscall Interface)
Date: Fri, 10 Jul 2020 19:02:12 +0200
Message-ID: <87a707z4kr.fsf@oldenburg2.str.redhat.com> (raw)
In-Reply-To: <cf8e41c7-8a58-f9bc-ab6a-ca5099bf6b46@synopsys.com> (Vineet Gupta via Libc-alpha's message of "Fri, 10 Jul 2020 15:53:25 +0000")

* Vineet Gupta via Libc-alpha:

> From scratch meaning glibc alone or the whole toolchain. I used
> buildroot and glibc-dirclean to nuke entire glibc but gcc was not
> rebuilt. I can try that too.

No, rebuilding glibc from scratch should be fine.

> Some of the failed tests have prints about static TLS block ... so I'm
> wondering if they could be related ?
>
> | $ cat dlfcn/tststatic.out
> | .../build/libc.so.6: cannot allocate memory in static TLS block

This suggests to me that the static initialization code does not produce
sufficient alignment for the TCB, given the 32-byte alignment required
by the rseq area.

You could try and see what happens if you change
sysdeps/arc/nptl/pthreaddef.h to this:

/* Alignment requirement for TCB.  */
#define TCB_ALIGNMENT           32

If that helps, we have more of a generic issue here. 8-/

The problem is that the TLS memory allocator does not add alignment
padding on its own.  This could meet additional alignment requirements
if there is just one thread yet when higher-aligned TLS is loaded.

> Also while we figure this out, does this prevent ARC port from being
> committed.

I don't think so.  We just have to make sure that it does not block the
release, i.e. resolve this during the next week or two.  Do you think
that would that be possible?

Thanks,
Florian


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Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-15 20:14 [PATCH v7 00/13] glibc port to ARC processors Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 01/13] ARC: ABI Implementation Vineet Gupta
2020-07-01  0:06   ` [PATCH v7.1 " Vineet Gupta
     [not found]     ` <b6322150-240a-5f06-b700-83e3eb79deec@linaro.org>
2020-07-01 19:36       ` Vineet Gupta
2020-07-01 19:45         ` Adhemerval Zanella
2020-06-15 20:14 ` [PATCH v7 02/13] ARC: startup and dynamic linking code Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 03/13] ARC: Thread Local Storage support Vineet Gupta
2020-07-01  0:07   ` [PATCH v7.1 " Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 04/13] ARC: Atomics and Locking primitives Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 05/13] ARC: math soft float support Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 06/13] ARC: hardware floating point support Vineet Gupta
2020-07-01  0:08   ` [PATCH v7.1 " Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 07/13] ARC: Linux Syscall Interface Vineet Gupta
2020-07-01  0:08   ` [PATCH v7.1 " Vineet Gupta
     [not found]     ` <e9e2ae28-cd78-5924-c1fa-52b1499c245a@linaro.org>
2020-07-04  3:54       ` Vineet Gupta
2020-07-06 13:20         ` Adhemerval Zanella
2020-07-07  1:25           ` Vineet Gupta
2020-07-07 19:24             ` Adhemerval Zanella
2020-07-07 20:55               ` [PATCH v7.2 " Vineet Gupta
     [not found]                 ` <b64d0df1-4229-d619-0ab1-ded287323775@linaro.org>
2020-07-08 19:32                   ` Vineet Gupta
2020-07-09 16:03                     ` Adhemerval Zanella
2020-07-09 16:24                       ` Vineet Gupta
2020-07-09 16:25                         ` Adhemerval Zanella
2020-07-09 21:13                         ` Vineet Gupta
2020-07-09 21:36                           ` ARC testsuite regressions (was Re: [PATCH v7.2 07/13] ARC: Linux Syscall Interface) Vineet Gupta
2020-07-09 22:01                             ` Alistair Francis
2020-07-09 22:16                               ` Vineet Gupta
2020-07-10  9:28                               ` Florian Weimer
2020-07-10 15:53                                 ` Vineet Gupta
2020-07-10 17:02                                   ` Florian Weimer [this message]
2020-07-10 20:07                                     ` Vineet Gupta
2020-07-10 20:32                                       ` Florian Weimer
2020-07-10 19:12                                   ` Alistair Francis
2020-07-10 20:33                                     ` Florian Weimer
2020-07-10 20:56                                       ` Alistair Francis
2020-07-10 19:10                                 ` Alistair Francis
2020-07-07 21:07               ` [PATCH v7.1 07/13] ARC: Linux Syscall Interface Vineet Gupta
2020-07-07 21:32                 ` Joseph Myers
2020-07-07 23:16                   ` Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 08/13] ARC: Linux ABI Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 09/13] ARC: Linux Startup and Dynamic Loading Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 10/13] ARC: ABI lists Vineet Gupta
2020-07-01  0:09   ` [PATCH v7.1 " Vineet Gupta
2020-06-15 20:14 ` [PATCH v7 11/13] ARC: Build Infrastructure Vineet Gupta
2020-07-03 17:09   ` Adhemerval Zanella
2020-06-15 20:14 ` [PATCH v7 12/13] build-many-glibcs.py: Enable ARC builds Vineet Gupta
2020-07-03 17:37   ` Adhemerval Zanella
2020-06-15 20:14 ` [PATCH v7 13/13] Documentation for ARC port Vineet Gupta
2020-07-03 17:38   ` Adhemerval Zanella
2020-06-23 16:56 ` [PATCH v7 00/13] glibc port to ARC processors Vineet Gupta
2020-07-01  0:11   ` Vineet Gupta
2020-07-01  1:44     ` Adhemerval Zanella
2020-07-01 19:13       ` Vineet Gupta
2020-07-02  1:00         ` ARC math test regressions (was Re: [PATCH v7 00/13] glibc port to ARC processors) Vineet Gupta
2020-07-02  7:17           ` Andreas Schwab
2020-07-02 16:27           ` Joseph Myers
2020-07-02 17:45             ` Vineet Gupta
2020-07-02 21:27       ` [PATCH v7 00/13] glibc port to ARC processors Joseph Myers

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