Re: [creduce-bugs] oscillation in creducing

[Дмитрий Дьяченко <dimhen@gmail.com>]

Hi Yang,
I compile creduce by gcc-8 from Fedora distro, not by clang-7

Dmitry

$ gcc -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap
--enable-languages=c,c++,fortran,objc,obj-c++,ada,go,lto --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared
--enable-threads=posix --enable-checking=release --enable-multilib
--with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-gnu-unique-object
--enable-linker-build-id --with-gcc-major-version-only
--with-linker-hash-style=gnu --enable-plugin --enable-initfini-array
--with-isl --enable-libmpx --enable-offload-targets=nvptx-none
--without-cuda-driver --enable-gnu-indirect-function --enable-cet
--with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 8.3.1 20190223 (Red Hat 8.3.1-2) (GCC)

чт, 18 апр. 2019 г. в 11:36, Yang Chen <chenyang@cs.utah.edu>:
>
> Hi Dmitry,
>
> It looks like the erroneous behavior was triggered by some bad
> transformation in copy propagation pass. If possible, could you send us
> the "best" reduced file after you hit Ctrl-C? Probably I could reproduce
> the behavior locally. Thanks!
>
> - Yang
>
>
> On 4/18/19 1:02 AM, Дмитрий Дьяченко wrote:
> > Hi!
> >
> > I hit a strange situation -- creducing start "oscillate" at some point
> > -- end of log follow.
> >
> > May be due inconsistency? -- from script I return `100' at some
> > situation (gcc ICE), but run creduce w/o `--also-interesting 100'
> >
> > After ^C and restarting, reduction continues as usual w/o "oscillations".
> >
> > Do you have a suggestion how I can bugreport it?
> > And 'll it be helpful to bugreport?
> >
> > Thanks,
> > Dmitry
> >
> > Fedora 29 x86_64
> > creduce/master compiled from sources,
> > clang-7.0.1 from Fedora 29 distro
> >
> >
> > creduce --sllooww --n 3 .. ...
> > [...]
> > (98.9 %, 6075 bytes)
> > (98.9 %, 5985 bytes)
> > ===< pass_clang :: aggregate-to-scalar >===
> > ===< pass_clang :: param-to-global >===
> > (98.9 %, 5942 bytes)
> > (98.9 %, 5916 bytes)
> > (98.9 %, 5973 bytes)
> > (98.9 %, 6016 bytes)
> > (98.9 %, 5998 bytes)
> > shell-init: error retrieving current directory: getcwd: cannot access
> > parent directories: No such file or directory
> > (98.9 %, 5974 bytes)
> > (98.9 %, 5962 bytes)
> > (98.9 %, 5992 bytes)
> > (98.9 %, 6018 bytes)
> > (98.9 %, 6073 bytes)
> > ===< pass_clang :: param-to-local >===
> > (98.9 %, 6091 bytes)
> > ===< pass_clang :: remove-nested-function >===
> > (98.8 %, 6135 bytes)
> > (98.8 %, 6189 bytes)
> > ===< pass_clang :: union-to-struct >===
> > ===< pass_clang :: return-void >===
> > (98.8 %, 6181 bytes)
> > (98.8 %, 6181 bytes)
> > ===< pass_clang :: simple-inliner >===
> > (98.8 %, 6148 bytes)
> > (98.8 %, 6209 bytes)
> > (98.8 %, 6318 bytes)
> > (98.8 %, 6652 bytes)
> > (98.7 %, 6685 bytes)
> > (98.7 %, 6965 bytes)
> > ===< pass_clang :: reduce-pointer-level >===
> > clang_delta: ReducePointerLevel.cpp:877: void
> > ReducePointerLevel::getNewLocalInitStr(const clang::Expr*,
> > std::__cxx11::string&): Assertion `0 && "Uncaught initializer!"'
> > failed.
> > sh: line 1: 31078 Aborted                 (core dumped)
> > "/usr/local/creduce/libexec/clang_delta"
> > --transformation=reduce-pointer-level --counter=1
> > /tmp/creduce-u2bwLK/a.ii > /tmp/97sto66S0m
> >
> > ***************************************************
> >
> > pass_clang::reduce-pointer-level has encountered a bug:
> > crashed: "/usr/local/creduce/libexec/clang_delta"
> > --transformation=reduce-pointer-level --counter=1
> > /tmp/creduce-u2bwLK/a.ii
> >
> > Please consider tarring up /home/dimhen/errs/gcc9/x2/creduce_bug_000
> > and mailing it to creduce-bugs@flux.utah.edu and we will try to fix
> > the bug.
> >
> > This bug is not fatal, C-Reduce will continue to execute.
> >
> > ***************************************************
> >
> > ===< pass_clang :: lift-assignment-expr >===
> > ===< pass_clang :: copy-propagation >===
> > (98.7 %, 6975 bytes)
> > (98.7 %, 6965 bytes)
> > (98.7 %, 6975 bytes)
> > shell-init: error retrieving current directory: getcwd: cannot access
> > parent directories: No such file or directory
> > (98.7 %, 6965 bytes)
> > (98.7 %, 6975 bytes)
> > (98.7 %, 6965 bytes)
> > (98.7 %, 6975 bytes)
> > [...]
> >
> > ... I terminate it by pressing ^C after 10-15 minutes seeing 6965 / 6975 lines