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Date: Thu, 14 Nov 2013 17:29:00 -0000
Message-ID: <CAFULd4YedhuGWb2f30EW12tWR0PqjCY7XuKs=whOK0Zbm6iZ8w@mail.gmail.com>
Subject: Re: Signal handling broken on alpha since glibc-2.16
From: Uros Bizjak <ubizjak@gmail.com>
To: Matt Turner <mattst88@gmail.com>
Cc: Richard Henderson <rth@twiddle.net>, libc-ports@sourceware.org, 	Mike Frysinger <vapier@gentoo.org>, Gentoo alpha AT <alpha@gentoo.org>
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On Thu, Nov 14, 2013 at 5:43 PM, Matt Turner <mattst88@gmail.com> wrote:

>>>>> A test from the gcc test suite shows that signal handling is broken on
>>>>> alpha since glibc-2.16. Bisecting before the glibc-ports merge is
>>>>> rather hard.
>>>>>
>>>>> See: https://bugs.gentoo.org/show_bug.cgi?id=480740 (includes test case)
>>>>>
>>>>> Off hand, do any changes between 2.15 and 2.16 seem to be likely
>>>>> candidates to cause this bug?
>>>>
>>>> It's likely to be change 7d1feb5693be7e606104cc2b6657c746a93e5926.
>>>>
>>>> Please try this.
>>>
>>> Looks like it works here. Thanks!
>>>
>>> RA = 0x120000c44, CFA = 0x11fc9e800
>>> RA = 0x120000c78, CFA = 0x11fc9e810
>>> RA = 0x200000b49d0, CFA = 0x11fc9e820
>>> RA = 0x120000aac, CFA = 0x11fc9eb58
>>> RA = 0x120000b38, CFA = 0x11fc9eb90
>>> RA = 0x120000b58, CFA = 0x11fc9ec30
>>> RA = 0x1200008e8, CFA = 0x11fc9ec40
>>> RA = 0x2000009ad00, CFA = 0x11fc9ec50
>>> Aborted
>>
>> The test should not abort. Did you compiled it with -fexceptions
>> -fnon-call-exceptions?
>
> Whoops. Compiling with the proper CFLAGS leads to better results:
>
> RA = 0x120000bdc, CFA = 0x11f8f8f00
> RA = 0x120000c14, CFA = 0x11f8f8f00
> RA = 0x120000c38, CFA = 0x11f8f8f10
> RA = 0x120000c5c, CFA = 0x11f8f8f10
> RA = 0x2000009e9d0, CFA = 0x11f8f8f20
> RA = 0x120000aec, CFA = 0x11f8f9258
> RA = 0x120000b84, CFA = 0x11f8f9280
> RA = 0x120000d28, CFA = 0x11f8f9320

Yes, this is the correct sequence (the signal frame is the 5th frame),
and we are able to unwind through the signal frame again.

Thanks,
Uros.