https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78548
Zhendong Su <su at cs dot ucdavis.edu> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |su at cs dot ucdavis.edu
--- Comment #2 from Zhendong Su <su at cs dot ucdavis.edu> ---
I can still reproduce it with r242892 with "-Wall -w -O3 -m64". Interestingly,
without "-m64", GCC hangs, instead of crashing.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20161127 (experimental) [trunk revision 242892] (GCC)
$
$ gcc-trunk -Wall -w -O3 -m64 small.c
*** Error in `/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/cc1':
double free or corruption (fasttop): 0x00000000038273b0 ***
small.c: In function ‘main’:
small.c:6:5: internal compiler error: Aborted
int main ( ) {
^~~~
0xbfe10f crash_signal
../../gcc-source-trunk/gcc/toplev.c:333
0xe1c630 xcallocator<gimple*>::data_free(gimple**)
../../gcc-source-trunk/gcc/hash-table.h:273
0xe1c630 ~hash_table
../../gcc-source-trunk/gcc/hash-table.h:627
0xe1c630 ~hash_set
../../gcc-source-trunk/gcc/hash-set.h:25
0xe1c630 find_def_preds
../../gcc-source-trunk/gcc/tree-ssa-uninit.c:775
0xe1c630 is_use_properly_guarded
../../gcc-source-trunk/gcc/tree-ssa-uninit.c:2375
0xe1da0a find_uninit_use
../../gcc-source-trunk/gcc/tree-ssa-uninit.c:2434
0xe1da0a warn_uninitialized_phi
../../gcc-source-trunk/gcc/tree-ssa-uninit.c:2504
0xe1da0a execute
../../gcc-source-trunk/gcc/tree-ssa-uninit.c:2612
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$
