GNU bug report logs - #16304
Upcoming clang-3.4 apparently miscompiles coreutils.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Markus Trippelsdorf <markus <at> trippelsdorf.de>
To: bug-coreutils <at> gnu.org
Subject: Upcoming clang-3.4 apparently miscompiles coreutils.
Date: Mon, 30 Dec 2013 13:32:19 +0100

coreutils-8.22 build with clang-3.4 doesn't copy permissions correctly:

markus <at> x4 tmp % touch test1
markus <at> x4 tmp % chmod 600 test1
markus <at> x4 tmp % ls -al test1
-rw------- 1 markus markus 0 Dec 30 13:25 test1
markus <at> x4 tmp % /var/tmp/coreutils-8.22/src/cp test1 test2
markus <at> x4 tmp % ls -al test2
---------- 1 markus markus 0 Dec 30 13:25 test2
markus <at> x4 tmp %


-- 
Markus

Message #8 received at 16304 <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: Markus Trippelsdorf <markus <at> trippelsdorf.de>
Cc: 16304 <at> debbugs.gnu.org
Subject: Re: bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils.
Date: Mon, 30 Dec 2013 18:47:11 +0000

On 12/30/2013 12:32 PM, Markus Trippelsdorf wrote:
> coreutils-8.22 build with clang-3.4 doesn't copy permissions correctly:
> 
> markus <at> x4 tmp % touch test1
> markus <at> x4 tmp % chmod 600 test1
> markus <at> x4 tmp % ls -al test1
> -rw------- 1 markus markus 0 Dec 30 13:25 test1
> markus <at> x4 tmp % /var/tmp/coreutils-8.22/src/cp test1 test2
> markus <at> x4 tmp % ls -al test2
> ---------- 1 markus markus 0 Dec 30 13:25 test2
> markus <at> x4 tmp %

Ouch.

Note as part of the 8.22 release process
I did verify that `make check` passed with
clang-3.3-3.fc20.x86_64

I've again verified that clang-3.3 passes your test above.

Can you pinpoint the erroneous code?
It does seem like a clang regression TBH.

thanks,
Pádraig.

Message #11 received at 16304 <at> debbugs.gnu.org (full text, mbox):

From: Markus Trippelsdorf <markus <at> trippelsdorf.de>
To: Pádraig Brady <P <at> draigBrady.com>
Cc: Andrew Trick <atrick <at> apple.com>, 16304 <at> debbugs.gnu.org
Subject: Re: bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils.
Date: Mon, 30 Dec 2013 22:47:05 +0100

On 2013.12.30 at 18:47 +0000, Pádraig Brady wrote:
> On 12/30/2013 12:32 PM, Markus Trippelsdorf wrote:
> > coreutils-8.22 build with clang-3.4 doesn't copy permissions correctly:
> > 
> > markus <at> x4 tmp % touch test1
> > markus <at> x4 tmp % chmod 600 test1
> > markus <at> x4 tmp % ls -al test1
> > -rw------- 1 markus markus 0 Dec 30 13:25 test1
> > markus <at> x4 tmp % /var/tmp/coreutils-8.22/src/cp test1 test2
> > markus <at> x4 tmp % ls -al test2
> > ---------- 1 markus markus 0 Dec 30 13:25 test2
> > markus <at> x4 tmp %
> 
> Ouch.
> 
> Note as part of the 8.22 release process
> I did verify that `make check` passed with
> clang-3.3-3.fc20.x86_64
> 
> I've again verified that clang-3.3 passes your test above.
> 
> Can you pinpoint the erroneous code?
> It does seem like a clang regression TBH.

Started with LLVM r192750 (Enable MI Sched for x86).
I've opened a LLVM bug here:
http://llvm.org/bugs/show_bug.cgi?id=18346

(I will try to come up with a testcase after the holidays)

-- 
Markus

Message #14 received at 16304 <at> debbugs.gnu.org (full text, mbox):

From: Andrew Trick <atrick <at> apple.com>
To: Markus Trippelsdorf <markus <at> trippelsdorf.de>
Cc: Pádraig Brady <P <at> draigBrady.com>, 16304 <at> debbugs.gnu.org
Subject: Re: bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils.
Date: Tue, 31 Dec 2013 11:12:15 -0800

On Dec 30, 2013, at 1:47 PM, Markus Trippelsdorf <markus <at> trippelsdorf.de> wrote:

> On 2013.12.30 at 18:47 +0000, Pádraig Brady wrote:
>> On 12/30/2013 12:32 PM, Markus Trippelsdorf wrote:
>>> coreutils-8.22 build with clang-3.4 doesn't copy permissions correctly:
>>> 
>>> markus <at> x4 tmp % touch test1
>>> markus <at> x4 tmp % chmod 600 test1
>>> markus <at> x4 tmp % ls -al test1
>>> -rw------- 1 markus markus 0 Dec 30 13:25 test1
>>> markus <at> x4 tmp % /var/tmp/coreutils-8.22/src/cp test1 test2
>>> markus <at> x4 tmp % ls -al test2
>>> ---------- 1 markus markus 0 Dec 30 13:25 test2
>>> markus <at> x4 tmp %
>> 
>> Ouch.
>> 
>> Note as part of the 8.22 release process
>> I did verify that `make check` passed with
>> clang-3.3-3.fc20.x86_64
>> 
>> I've again verified that clang-3.3 passes your test above.
>> 
>> Can you pinpoint the erroneous code?
>> It does seem like a clang regression TBH.
> 
> Started with LLVM r192750 (Enable MI Sched for x86).
> I've opened a LLVM bug here:
> http://llvm.org/bugs/show_bug.cgi?id=18346
> 
> (I will try to come up with a testcase after the holidays)

To determine whether a bug exists in MI scheduler pass (or downstream) you can do this:
-mllvm -enable-misched=false.

Duncan committed a post-3.4 fix, r197503, for a varargs bug exposed by changes to the SD scheduling policy.

-Andy

Message #17 received at 16304 <at> debbugs.gnu.org (full text, mbox):

From: Markus Trippelsdorf <markus <at> trippelsdorf.de>
To: Andrew Trick <atrick <at> apple.com>
Cc: Pádraig Brady <P <at> draigBrady.com>, 16304 <at> debbugs.gnu.org
Subject: Re: bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils.
Date: Tue, 31 Dec 2013 20:39:02 +0100

On 2013.12.31 at 11:12 -0800, Andrew Trick wrote:
> 
> On Dec 30, 2013, at 1:47 PM, Markus Trippelsdorf <markus <at> trippelsdorf.de> wrote:
> 
> > On 2013.12.30 at 18:47 +0000, Pádraig Brady wrote:
> >> On 12/30/2013 12:32 PM, Markus Trippelsdorf wrote:
> >>> coreutils-8.22 build with clang-3.4 doesn't copy permissions correctly:
> >>> 
> >>> markus <at> x4 tmp % touch test1
> >>> markus <at> x4 tmp % chmod 600 test1
> >>> markus <at> x4 tmp % ls -al test1
> >>> -rw------- 1 markus markus 0 Dec 30 13:25 test1
> >>> markus <at> x4 tmp % /var/tmp/coreutils-8.22/src/cp test1 test2
> >>> markus <at> x4 tmp % ls -al test2
> >>> ---------- 1 markus markus 0 Dec 30 13:25 test2
> >>> markus <at> x4 tmp %
> >> 
> >> Ouch.
> >> 
> >> Note as part of the 8.22 release process
> >> I did verify that `make check` passed with
> >> clang-3.3-3.fc20.x86_64
> >> 
> >> I've again verified that clang-3.3 passes your test above.
> >> 
> >> Can you pinpoint the erroneous code?
> >> It does seem like a clang regression TBH.
> > 
> > Started with LLVM r192750 (Enable MI Sched for x86).
> > I've opened a LLVM bug here:
> > http://llvm.org/bugs/show_bug.cgi?id=18346
> > 
> > (I will try to come up with a testcase after the holidays)
> 
> To determine whether a bug exists in MI scheduler pass (or downstream) you can do this:
> -mllvm -enable-misched=false.
> 
> Duncan committed a post-3.4 fix, r197503, for a varargs bug exposed by
> changes to the SD scheduling policy.

Yes, r197503 fixes the issue. Would be nice to get the fix applied
before 3.4 gets released...

-- 
Markus

Message #20 received at 16304 <at> debbugs.gnu.org (full text, mbox):

From: Andrew Trick <atrick <at> apple.com>
To: Markus Trippelsdorf <markus <at> trippelsdorf.de>
Cc: Pádraig Brady <P <at> draigBrady.com>,
 Bill Wendling <wendling <at> apple.com>, 16304 <at> debbugs.gnu.org
Subject: Re: bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils.
Date: Tue, 31 Dec 2013 11:42:59 -0800

On Dec 31, 2013, at 11:39 AM, Markus Trippelsdorf <markus <at> trippelsdorf.de> wrote:

> On 2013.12.31 at 11:12 -0800, Andrew Trick wrote:
>> 
>> On Dec 30, 2013, at 1:47 PM, Markus Trippelsdorf <markus <at> trippelsdorf.de> wrote:
>> 
>>> On 2013.12.30 at 18:47 +0000, Pádraig Brady wrote:
>>>> On 12/30/2013 12:32 PM, Markus Trippelsdorf wrote:
>>>>> coreutils-8.22 build with clang-3.4 doesn't copy permissions correctly:
>>>>> 
>>>>> markus <at> x4 tmp % touch test1
>>>>> markus <at> x4 tmp % chmod 600 test1
>>>>> markus <at> x4 tmp % ls -al test1
>>>>> -rw------- 1 markus markus 0 Dec 30 13:25 test1
>>>>> markus <at> x4 tmp % /var/tmp/coreutils-8.22/src/cp test1 test2
>>>>> markus <at> x4 tmp % ls -al test2
>>>>> ---------- 1 markus markus 0 Dec 30 13:25 test2
>>>>> markus <at> x4 tmp %
>>>> 
>>>> Ouch.
>>>> 
>>>> Note as part of the 8.22 release process
>>>> I did verify that `make check` passed with
>>>> clang-3.3-3.fc20.x86_64
>>>> 
>>>> I've again verified that clang-3.3 passes your test above.
>>>> 
>>>> Can you pinpoint the erroneous code?
>>>> It does seem like a clang regression TBH.
>>> 
>>> Started with LLVM r192750 (Enable MI Sched for x86).
>>> I've opened a LLVM bug here:
>>> http://llvm.org/bugs/show_bug.cgi?id=18346
>>> 
>>> (I will try to come up with a testcase after the holidays)
>> 
>> To determine whether a bug exists in MI scheduler pass (or downstream) you can do this:
>> -mllvm -enable-misched=false.
>> 
>> Duncan committed a post-3.4 fix, r197503, for a varargs bug exposed by
>> changes to the SD scheduling policy.
> 
> Yes, r197503 fixes the issue. Would be nice to get the fix applied
> before 3.4 gets released...

Yep, it would be nice. But the fix was considered too late 2 weeks ago, so it’s even less likely now. I don’t think there’s any way to rerun validation at this point. I’m copying Bill who is the authority.

-Andy

Message #23 received at 16304 <at> debbugs.gnu.org (full text, mbox):

From: Andrew Trick <atrick <at> apple.com>
To: Markus Trippelsdorf <markus <at> trippelsdorf.de>
Cc: Bill Wendling <isanbard <at> gmail.com>,
 Pádraig Brady <P <at> draigBrady.com>, 16304 <at> debbugs.gnu.org
Subject: Re: bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils.
Date: Tue, 31 Dec 2013 11:46:18 -0800

My previous reply didn’t have Bill’s correct email.

On Dec 31, 2013, at 11:42 AM, Andrew Trick <atrick <at> apple.com> wrote:

> 
> On Dec 31, 2013, at 11:39 AM, Markus Trippelsdorf <markus <at> trippelsdorf.de> wrote:
> 
>> On 2013.12.31 at 11:12 -0800, Andrew Trick wrote:
>>> 
>>> On Dec 30, 2013, at 1:47 PM, Markus Trippelsdorf <markus <at> trippelsdorf.de> wrote:
>>> 
>>>> On 2013.12.30 at 18:47 +0000, Pádraig Brady wrote:
>>>>> On 12/30/2013 12:32 PM, Markus Trippelsdorf wrote:
>>>>>> coreutils-8.22 build with clang-3.4 doesn't copy permissions correctly:
>>>>>> 
>>>>>> markus <at> x4 tmp % touch test1
>>>>>> markus <at> x4 tmp % chmod 600 test1
>>>>>> markus <at> x4 tmp % ls -al test1
>>>>>> -rw------- 1 markus markus 0 Dec 30 13:25 test1
>>>>>> markus <at> x4 tmp % /var/tmp/coreutils-8.22/src/cp test1 test2
>>>>>> markus <at> x4 tmp % ls -al test2
>>>>>> ---------- 1 markus markus 0 Dec 30 13:25 test2
>>>>>> markus <at> x4 tmp %
>>>>> 
>>>>> Ouch.
>>>>> 
>>>>> Note as part of the 8.22 release process
>>>>> I did verify that `make check` passed with
>>>>> clang-3.3-3.fc20.x86_64
>>>>> 
>>>>> I've again verified that clang-3.3 passes your test above.
>>>>> 
>>>>> Can you pinpoint the erroneous code?
>>>>> It does seem like a clang regression TBH.
>>>> 
>>>> Started with LLVM r192750 (Enable MI Sched for x86).
>>>> I've opened a LLVM bug here:
>>>> http://llvm.org/bugs/show_bug.cgi?id=18346
>>>> 
>>>> (I will try to come up with a testcase after the holidays)
>>> 
>>> To determine whether a bug exists in MI scheduler pass (or downstream) you can do this:
>>> -mllvm -enable-misched=false.
>>> 
>>> Duncan committed a post-3.4 fix, r197503, for a varargs bug exposed by
>>> changes to the SD scheduling policy.
>> 
>> Yes, r197503 fixes the issue. Would be nice to get the fix applied
>> before 3.4 gets released...
> 
> Yep, it would be nice. But the fix was considered too late 2 weeks ago, so it’s even less likely now. I don’t think there’s any way to rerun validation at this point. I’m copying Bill who is the authority.
> 
> -Andy

Message #26 received at 16304 <at> debbugs.gnu.org (full text, mbox):

From: Bill Wendling <isanbard <at> gmail.com>
To: Andrew Trick <atrick <at> apple.com>
Cc: Pádraig Brady <P <at> draigBrady.com>,
 Markus Trippelsdorf <markus <at> trippelsdorf.de>, 16304 <at> debbugs.gnu.org
Subject: Re: bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils.
Date: Tue, 31 Dec 2013 19:01:48 -0800

It really is too late now. The release has been put to bed, as it were. We’re now waiting for Chris to announce it.

-bw

On Dec 31, 2013, at 11:46 AM, Andrew Trick <atrick <at> apple.com> wrote:

> My previous reply didn’t have Bill’s correct email.
> 
> On Dec 31, 2013, at 11:42 AM, Andrew Trick <atrick <at> apple.com> wrote:
> 
>> 
>> On Dec 31, 2013, at 11:39 AM, Markus Trippelsdorf <markus <at> trippelsdorf.de> wrote:
>> 
>>> On 2013.12.31 at 11:12 -0800, Andrew Trick wrote:
>>>> 
>>>> On Dec 30, 2013, at 1:47 PM, Markus Trippelsdorf <markus <at> trippelsdorf.de> wrote:
>>>> 
>>>>> On 2013.12.30 at 18:47 +0000, Pádraig Brady wrote:
>>>>>> On 12/30/2013 12:32 PM, Markus Trippelsdorf wrote:
>>>>>>> coreutils-8.22 build with clang-3.4 doesn't copy permissions correctly:
>>>>>>> 
>>>>>>> markus <at> x4 tmp % touch test1
>>>>>>> markus <at> x4 tmp % chmod 600 test1
>>>>>>> markus <at> x4 tmp % ls -al test1
>>>>>>> -rw------- 1 markus markus 0 Dec 30 13:25 test1
>>>>>>> markus <at> x4 tmp % /var/tmp/coreutils-8.22/src/cp test1 test2
>>>>>>> markus <at> x4 tmp % ls -al test2
>>>>>>> ---------- 1 markus markus 0 Dec 30 13:25 test2
>>>>>>> markus <at> x4 tmp %
>>>>>> 
>>>>>> Ouch.
>>>>>> 
>>>>>> Note as part of the 8.22 release process
>>>>>> I did verify that `make check` passed with
>>>>>> clang-3.3-3.fc20.x86_64
>>>>>> 
>>>>>> I've again verified that clang-3.3 passes your test above.
>>>>>> 
>>>>>> Can you pinpoint the erroneous code?
>>>>>> It does seem like a clang regression TBH.
>>>>> 
>>>>> Started with LLVM r192750 (Enable MI Sched for x86).
>>>>> I've opened a LLVM bug here:
>>>>> http://llvm.org/bugs/show_bug.cgi?id=18346
>>>>> 
>>>>> (I will try to come up with a testcase after the holidays)
>>>> 
>>>> To determine whether a bug exists in MI scheduler pass (or downstream) you can do this:
>>>> -mllvm -enable-misched=false.
>>>> 
>>>> Duncan committed a post-3.4 fix, r197503, for a varargs bug exposed by
>>>> changes to the SD scheduling policy.
>>> 
>>> Yes, r197503 fixes the issue. Would be nice to get the fix applied
>>> before 3.4 gets released...
>> 
>> Yep, it would be nice. But the fix was considered too late 2 weeks ago, so it’s even less likely now. I don’t think there’s any way to rerun validation at this point. I’m copying Bill who is the authority.
>> 
>> -Andy
> 

Message #29 received at 16304 <at> debbugs.gnu.org (full text, mbox):

From: Assaf Gordon <assafgordon <at> gmail.com>
To: 16304 <at> debbugs.gnu.org
Subject: Re: bug#16304: Upcoming clang-3.4 apparently miscompiles coreutils.
Date: Fri, 19 Oct 2018 17:30:09 -0600

tags 16304 notabug
close 16304
stop

(triaging old bugs)
This clang-3.4 bug has been fixed some time ago
(and it's not a coreutils bug).

Closing.

-assaf

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