https://bugzilla.novell.com/show_bug.cgi?id=756235
https://bugzilla.novell.com/show_bug.cgi?id=756235#c0
Summary: gcc hangs
Classification: openSUSE
Product: openSUSE 12.1
Version: Final
Platform: x86-64
OS/Version: openSUSE 12.1
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Development
AssignedTo: bnc-team-screening@forge.provo.novell.com
ReportedBy: bart@bartvanassche.be
QAContact: qa-bugs@suse.de
Found By: ---
Blocker: ---
Created an attachment (id=485279)
--> (http://bugzilla.novell.com/attachment.cgi?id=485279)
Test input t.c
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20100101
Firefox/11.0
gcc never finishes for certain input.
Reproducible: Always
Steps to Reproduce:
1. Make sure that the RPM gcc-4.6-15.1.3.x86_64 is installed.
2. Start gcc as follows:
gcc -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing
-fno-common -Werror-implicit-function-declaration -Wno-format-security
-fno-delete-null-pointer-checks -O2 -m64 -march=core2 -mno-red-zone
-mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -Wno-sign-compare
-fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
-Wframe-larger-than=1024 -fno-stack-protector -Wno-unused-but-set-variable
-fno-omit-frame-pointer -fno-optimize-sibling-calls -g
-femit-struct-debug-baseonly -pg -Wdeclaration-after-statement
-Wno-pointer-sign -fno-strict-overflow -fconserve-stack -fno-inline
-fno-inline-functions -S t.c
Actual Results:
gcc hangs: compilation never finishes and CPU usage is 100%. According to gdb,
gcc hangs in the following code:
(gdb) bt
#0 canonicalize_values_star (slot=0x19118d0, data=0x180f088) at
../../gcc/var-tracking.c:3144
#1 0x0000000000af84e8 in htab_traverse_noresize (htab=<optimized out>,
callback=0x7ccb50 , info=0x180f088) at
../../libiberty/hashtab.c:784
#2 0x00000000007cfc49 in compute_bb_dataflow (bb=<optimized out>) at
../../gcc/var-tracking.c:6015
#3 0x00000000007d3a43 in vt_find_locations () at ../../gcc/var-tracking.c:6155
#4 0x00000000007d4105 in variable_tracking_main_1 () at
../../gcc/var-tracking.c:8563
#5 variable_tracking_main () at ../../gcc/var-tracking.c:8608
#6 0x0000000000614724 in execute_one_pass (pass=0x10364a0) at
../../gcc/passes.c:1556
#7 execute_one_pass (pass=0x10364a0) at ../../gcc/passes.c:1499
#8 0x00000000006149a5 in execute_pass_list (pass=0x10364a0) at
../../gcc/passes.c:1611
#9 0x00000000006149b7 in execute_pass_list (pass=0x10331e0) at
../../gcc/passes.c:1612
#10 0x00000000006149b7 in execute_pass_list (pass=0x1033240) at
../../gcc/passes.c:1612
#11 0x00000000006df6d4 in tree_rest_of_compilation (fndecl=0x7fdb188c4400) at
../../gcc/tree-optimize.c:422
#12 0x000000000081fc8f in cgraph_expand_function (node=0x7fdb188cd2c0) at
../../gcc/cgraphunit.c:1576
#13 0x00000000008218ea in cgraph_expand_all_functions () at
../../gcc/cgraphunit.c:1635
#14 cgraph_optimize () at ../../gcc/cgraphunit.c:1899
#15 0x0000000000821caa in cgraph_finalize_compilation_unit () at
../../gcc/cgraphunit.c:1096
#16 0x000000000042cbc5 in c_write_global_declarations () at
../../gcc/c-decl.c:9871
#17 0x00000000006a458b in compile_file () at ../../gcc/toplev.c:591
#18 do_compile () at ../../gcc/toplev.c:1902
#19 toplev_main (argc=46, argv=0x7fff9f4496c8) at ../../gcc/toplev.c:1965
#20 0x00007fdb1a47f3bd in __libc_start_main () from /lib64/libc.so.6
#21 0x000000000041c5e9 in _start () at ../sysdeps/x86_64/elf/start.S:113
Expected Results:
Either an error message is printed or compilation finishes after some time.
$ rpm -q gcc
gcc-4.6-15.1.3.x86_64
$ rpm --verify gcc; echo $?
0
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib64/gcc/x86_64-suse-linux/4.6/lto-wrapper
Target: x86_64-suse-linux
Configured with: ../configure --prefix=/usr --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib64 --libexecdir=/usr/lib64
--enable-languages=c,c++,objc,fortran,obj-c++,java,ada
--enable-checking=release --with-gxx-include-dir=/usr/include/c++/4.6
--enable-ssp --disable-libssp --disable-plugin
--with-bugurl=http://bugs.opensuse.org/ --with-pkgversion='SUSE Linux'
--disable-libgcj --disable-libmudflap --with-slibdir=/lib64 --with-system-zlib
--enable-__cxa_atexit --enable-libstdcxx-allocator=new --disable-libstdcxx-pch
--enable-version-specific-runtime-libs --program-suffix=-4.6
--enable-linux-futex --without-system-libunwind --with-arch-32=i586
--with-tune=generic --build=x86_64-suse-linux
Thread model: posix
gcc version 4.6.2 (SUSE Linux)
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