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Subject: Re: [PATCH 1/2] Linux/x86: Update cancel_jmp_buf to match
 __jmp_buf_tag [BZ #22563]
To: "H.J. Lu" <hjl.tools@gmail.com>, Florian Weimer <fweimer@redhat.com>,
 Andreas Schwab <schwab@suse.de>, GNU C Library <libc-alpha@sourceware.org>,
 "Senkevich, Andrew" <andrew.senkevich@intel.com>
References: <e7e3e22f-2bf7-eb69-e114-ae4352d816bb@redhat.com>
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From: Carlos O'Donell <carlos@redhat.com>
Message-ID: <ae22bc8d-d5d2-eb89-b53e-ce491b2ad99a@redhat.com>
Date: Sun, 21 Jan 2018 16:50:00 -0000
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On 01/21/2018 08:27 AM, H.J. Lu wrote:
> On Sun, Jan 21, 2018 at 8:15 AM, Aurelien Jarno <aurelien@aurel32.net> wrote:
>> On 2018-01-09 11:47, Florian Weimer wrote:
>>> On 12/18/2017 03:48 PM, H.J. Lu wrote:
>>>> On Mon, Dec 18, 2017 at 6:44 AM, Andreas Schwab <schwab@suse.de> wrote:
>>>>> On Dez 18 2017, "H.J. Lu" <hjl.tools@gmail.com> wrote:
>>>>>
>>>>>> This patch adds bits/types/__cancel_jmp_buf_tag.h to define struct
>>>>>> __cancel_jmp_buf_tag so that Linux/x86 can add saved_mask to
>>>>>> cancel_jmp_buf.
>>>>>
>>>>> Isn't that an ABI change?
>>>>>
>>>>
>>>> Yes, this change is exposed to application via <phread.h>.  The backward
>>>> binary compatibility is provided by
>>>>
>>>> https://sourceware.org/ml/libc-alpha/2017-12/msg00208.html
>>>
>>> This doesn't seem to work:
>>>
>>> <https://sourceware.org/ml/libc-alpha/2018-01/msg00178.html>
>>>
>>> I have no idea what is going on, but if we can't find the root cause, I
>>> think we should revert all the setjmp changes.
>>
>> Commit f81ddabffd also breaks software like vlc or amarok, they crash
>> with a segmentation fault during startup. Reverting the commit
>> f81ddabffd fixes the issue.
>>
>> See debian bugs #887078 and #887886.
>>
> 
> Hi Andrew,
> 
> This may be easier to track.  Please investigate.
 
This is now the last remaining release blocker IMO.

I'm going to start investigating this on Monday.

-- 
Cheers,
Carlos.