Debian Bug report logs - #871514
gcc-7: miscompiles stack spills on mips64el

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

To: submit@bugs.debian.org

Subject: clamav: FTBFS on mips64el

Date: Tue, 8 Aug 2017 20:34:37 +0200

Package: clamav
Version: 0.99.2+dfsg-6
Severity: serious

The last build of clamav (0.99.3~beta1+dfsg-1) failed on mips64el.
However the build in experimtal (0.99.3~snapshot…) succeeded and code
change is very minimal (almost non-existing). The I tried 0.99.2+dfsg-6
on eller and it failed, too but passed in the past.

I looked slightly more closely on eller. After a complete build, the
command
|clamscan/clamscan --gen-json --quiet -dunit_tests/test-1/test-db \
|	unit_tests/input/phish-test-clean unit_tests/input/phish-test-cloak \
|	unit_tests/input/phish-test-ssl  --log=clamscan2.log --debug

returned (the important part):
|LibClamAV debug: parseEmailBody() rc 1 infect 0
|LibClamAV debug: parseEmailBody() returning 3

the matching C code by the end of parseEmailBody():
|         cli_dbgmsg("parseEmailBody() rc %d infect %d\n", (int)rc, infected);
|         if ((rc != FAIL) && infected)
|                 rc = VIRUS;
| 
|         cli_dbgmsg("parseEmailBody() returning %d\n", (int)rc);
 
and rc is type mbox_status:
| typedef enum {
|         FAIL,
|         OK,
|         OK_ATTACHMENTS_NOT_SAVED,
|         VIRUS,
|         MAXREC,
|         MAXFILES
| } mbox_status;

So rc is != FAIL and infected is 0 but the compiler manages to set rc to
VIRUS / 3.

The exp build passed with gcc-6_6.4.0-1 [0]. Is there an easy way to
downgrade the compiler on eller/porterbox? Or could a porter double
check this please?

[0] https://buildd.debian.org/status/fetch.php?pkg=clamav&arch=mips64el&ver=0.99.3~snapshot20170704%2Bdfsg-1&stamp=1499981584&raw=0

Sebastian

Message #10 received at 871514@bugs.debian.org (full text, mbox, reply):

From: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

To: 871514@bugs.debian.org

Cc: debian-mips@lists.debian.org, debian-gcc@lists.debian.org

Subject: Re: Bug#871514: clamav: FTBFS on mips64el

Date: Tue, 8 Aug 2017 20:41:26 +0200

On 2017-08-08 20:34:37 [+0200], To submit@bugs.debian.org wrote:
…
> returned (the important part):
> |LibClamAV debug: parseEmailBody() rc 1 infect 0
> |LibClamAV debug: parseEmailBody() returning 3
…
> The exp build passed with gcc-6_6.4.0-1 [0]. Is there an easy way to
> downgrade the compiler on eller/porterbox? Or could a porter double
> check this please?

on eller in a buster chroot:
|LibClamAV debug: parseEmailBody() rc 1 infect 0
|LibClamAV debug: parseEmailBody() returning 1

further suggestions?

Sebastian

Message #15 received at 871514@bugs.debian.org (full text, mbox, reply):

From: Aurelien Jarno <aurelien@aurel32.net>

To: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

Cc: 871514@bugs.debian.org, debian-mips@lists.debian.org, debian-gcc@lists.debian.org

Subject: Re: Bug#871514: clamav: FTBFS on mips64el

Date: Wed, 9 Aug 2017 16:43:29 +0200

On 2017-08-08 20:41, Sebastian Andrzej Siewior wrote:
> On 2017-08-08 20:34:37 [+0200], To submit@bugs.debian.org wrote:
> …
> > returned (the important part):
> > |LibClamAV debug: parseEmailBody() rc 1 infect 0
> > |LibClamAV debug: parseEmailBody() returning 3
> …
> > The exp build passed with gcc-6_6.4.0-1 [0]. Is there an easy way to
> > downgrade the compiler on eller/porterbox? Or could a porter double
> > check this please?
> 
> on eller in a buster chroot:
> |LibClamAV debug: parseEmailBody() rc 1 infect 0
> |LibClamAV debug: parseEmailBody() returning 1
> 
> further suggestions?

I got a quick look. It's indeed a regression introduced by GCC 7. It can
be workarounded by building the file with -O0, but already appears with
-O1 optimization.

I got a quick look with gdb and it seems that loading either the rc
(enum) or infect (bool variable to test it against 0, the load is done 
with the ld instruction instead of the lw instruction. It means garbage
from another local variable is loaded into the high 32 bits, which
causes the comparison against 0 to be false instead of true.

Aurelien

-- 
Aurelien Jarno                          GPG: 4096R/1DDD8C9B
aurelien@aurel32.net                 http://www.aurel32.net

Message #20 received at 871514@bugs.debian.org (full text, mbox, reply):

From: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>

To: 871514@bugs.debian.org, debian-mips@lists.debian.org, debian-gcc@lists.debian.org

Subject: Re: Bug#871514: clamav: FTBFS on mips64el

Date: Wed, 9 Aug 2017 21:29:56 +0200

control: reassign -1 gcc-7 7.1.0-12
control: affects -1 clamav

On 2017-08-09 16:43:29 [+0200], Aurelien Jarno wrote:
> I got a quick look. It's indeed a regression introduced by GCC 7. It can
> be workarounded by building the file with -O0, but already appears with
> -O1 optimization.
> 
> I got a quick look with gdb and it seems that loading either the rc
> (enum) or infect (bool variable to test it against 0, the load is done 
> with the ld instruction instead of the lw instruction. It means garbage
> from another local variable is loaded into the high 32 bits, which
> causes the comparison against 0 to be false instead of true.

Thanks for looking at this. I reassinged this bug to gcc-7. Would
forwarding the bug gcc upstream with the mbox.i be any help? I could a
label around the check so the comparison could be located in .S easier,
just don't know if this helps.

> Aurelien
> 

Sebastian

Message #57 received at 871514@bugs.debian.org (full text, mbox, reply):

From: James Cowgill <jcowgill@debian.org>

To: 871514@bugs.debian.org

Subject: Bug#871514: clamav: FTBFS on mips64el

Date: Wed, 23 Aug 2017 17:42:44 +0100

[Message part 1 (text/plain, inline)]

Control: forcemerge -1 872438

Hi,

Just a brief update on this bug. Unfortunately there is still no "good" fix.

As I have written in a few places now, the bug occurs on mips64el where
a "small" variable gets spilled to the stack. It is possible that GCC
writes the variable to the stack using a small instruction (like sw for
a 32-bit store) and then reloads it as a 64-bit integer (using ld). This
means that the upper bits of the loaded value will contain garbage
causing chaos later when the value is used.

The bug is almost certainly in the LRA part of the compiler which
handles spilling values to the stack. One possible temporary workaround
(originally suggested by Adrian Bunk) would be to disable LRA on
mips64el. I have tested the attached patch which does seem to work. The
disadvantage of this is that non-LRA hasn't really been tested on MIPS
for ages so it might introduce some other bugs. Given the scale of this
issue it might be worth it?

This bug is very closely related to an earlier GCC bootstrap failure on
mips64el: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78660
In comment 17 Matthew sent a patch and applying it also fixes this bug.
However, he tells me it has some other issues and isn't suitable to be
applied (which is presumably why it was reverted).

James

[disable-lra.patch (text/x-patch, attachment)]

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Message #86 received at 871514@bugs.debian.org (full text, mbox, reply):

From: James Cowgill <jcowgill@debian.org>

To: 871514@bugs.debian.org

Subject: Re: Bug#871514: gcc-7: miscompiles stack spills on mips64el

Date: Fri, 1 Sep 2017 11:59:06 +0100

[Message part 1 (text/plain, inline)]

Control: tags -1 patch

Hi,

On 23/08/17 17:42, James Cowgill wrote:
> This bug is very closely related to an earlier GCC bootstrap failure on
> mips64el: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78660
> In comment 17 Matthew sent a patch and applying it also fixes this bug.
> However, he tells me it has some other issues and isn't suitable to be
> applied (which is presumably why it was reverted).

Matthew has now had a better look at the bug and has posted a patch to
fix it which is a tweaked version of the patch above:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81803#c9

I've done some testing, and it seems to solve all the known package
failures (at least the ones on my list) caused by this bug and I haven't
noticed any failures with it. I also tested it on armhf and it causes no
regressions there (this was one of the issues with the earlier patch).

So I think the attached debdiff should be applied to gcc-7. Currently
the patch is applied everywhere, but if you want you could limit it to
mips64el.

Thanks,
James

[mips64-stack-spilling.debdiff (text/plain, attachment)]

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Message #93 received at 871514-close@bugs.debian.org (full text, mbox, reply):

From: Matthias Klose <doko@debian.org>

To: 871514-close@bugs.debian.org

Subject: Bug#871514: fixed in gcc-7 7.2.0-3

Date: Sat, 02 Sep 2017 12:19:30 +0000

Source: gcc-7
Source-Version: 7.2.0-3

We believe that the bug you reported is fixed in the latest version of
gcc-7, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 871514@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Matthias Klose <doko@debian.org> (supplier of updated gcc-7 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


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Format: 1.8
Date: Sat, 02 Sep 2017 13:55:18 +0200
Source: gcc-7
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Architecture: source
Version: 7.2.0-3
Distribution: unstable
Urgency: high
Maintainer: Debian GCC Maintainers <debian-gcc@lists.debian.org>
Changed-By: Matthias Klose <doko@debian.org>
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 libx32cilkrts5 - Intel Cilk Plus language extensions (x32)
 libx32cilkrts5-dbg - Intel Cilk Plus language extensions (x32 debug symbols)
 libx32gcc-7-dev - GCC support library (x32 development files)
 libx32gcc1 - GCC support library (x32)
 libx32gcc1-dbg - GCC support library (debug symbols)
 libx32gfortran-7-dev - Runtime library for GNU Fortran applications (x32 development fil
 libx32gfortran4 - Runtime library for GNU Fortran applications (x32)
 libx32gfortran4-dbg - Runtime library for GNU Fortran applications (x32 debug symbols)
 libx32go11 - Runtime library for GNU Go applications (x32)
 libx32go11-dbg - Runtime library for GNU Go applications (x32 debug symbols)
 libx32gomp1 - GCC OpenMP (GOMP) support library (x32)
 libx32gomp1-dbg - GCC OpenMP (GOMP) support library (x32 debug symbols)
 libx32gphobos-7-dev - Phobos D standard library (x32 development files)
 libx32gphobos71 - Phobos D standard library (runtime library)
 libx32gphobos71-dbg - Phobos D standard library (debug symbols)
 libx32itm1 - GNU Transactional Memory Library (x32)
 libx32itm1-dbg - GNU Transactional Memory Library (x32 debug symbols)
 libx32lsan0 - LeakSanitizer -- a memory leak detector (x32)
 libx32lsan0-dbg - LeakSanitizer -- a memory leak detector (x32 debug symbols)
 libx32objc-7-dev - Runtime library for GNU Objective-C applications (x32 development
 libx32objc4 - Runtime library for GNU Objective-C applications (x32)
 libx32objc4-dbg - Runtime library for GNU Objective-C applications (x32 debug symbo
 libx32quadmath0 - GCC Quad-Precision Math Library (x32)
 libx32quadmath0-dbg - GCC Quad-Precision Math Library (x32 debug symbols)
 libx32stdc++-7-dev - GNU Standard C++ Library v3 (development files)
 libx32stdc++6 - GNU Standard C++ Library v3 (x32)
 libx32stdc++6-7-dbg - GNU Standard C++ Library v3 (debugging files)
 libx32ubsan0 - UBSan -- undefined behaviour sanitizer (x32)
 libx32ubsan0-dbg - UBSan -- undefined behaviour sanitizer (x32 debug symbols)
Closes: 871514
Changes:
 gcc-7 (7.2.0-3) unstable; urgency=high
 .
   * Update to SVN 20170901 (r251583) from the gcc-7-branch.
     - Fix PR target/81504 (PPC), PR c++/82040.
   * Apply proposed patch for PR target/81803 (James Cowgill), conditionally
     for mips* targets. Closes: #871514.
   * Bump standards version.
Checksums-Sha1:
 ffc809349b8c457d49649929c97828754f058446 26355 gcc-7_7.2.0-3.dsc
 d8228b19822f051796d04ceb573b39ca5fe606ec 2974422 gcc-7_7.2.0-3.diff.gz
 64164cc805bed4d08029c65317995870afb159ac 11654 gcc-7_7.2.0-3_source.buildinfo
Checksums-Sha256:
 8ee75ae9f696c1077a7dd1e4f9672d56a62532345cd5a51ce636df8a442be8e9 26355 gcc-7_7.2.0-3.dsc
 71357aa5b7959ea56e3c348d91fc0ec42fe1b83e668ea5d995a9100d2efdc2fd 2974422 gcc-7_7.2.0-3.diff.gz
 3f81dde0cf07dfa207cacc89cefff8b38a4faa15fe7a76e02aa4730d8cd09638 11654 gcc-7_7.2.0-3_source.buildinfo
Files:
 45835ea321b19a49e9c2325fae6bf35e 26355 devel optional gcc-7_7.2.0-3.dsc
 5fe03ec93a44ed7f7677591c0327ae47 2974422 devel optional gcc-7_7.2.0-3.diff.gz
 64b703badff7a00a15d06859097ce78d 11654 devel optional gcc-7_7.2.0-3_source.buildinfo

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