http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48318
--- Comment #3 from Markus Elfring <Markus.Elfring at web dot de> 2011-03-29 13:10:41 UTC --- (In reply to comment #2) I can not generate a backtrace myself by the tool "GNU debugger" on my system at the moment because of the issue "GDB or dependency python not properly configured?". https://bugzilla.novell.com/show_bug.cgi?id=677225#c1 I have tried the build again. Now I get a result that is different from yesterday. dmesg: ... [10656.313658] genmddeps[9790]: segfault at 607bb0 ip 0000000000607bb0 sp 00007fff77ba4d38 error 15 in genmddeps[607000+1000] [11339.164308] conftest[20445]: segfault at 600ae0 ip 0000000000600ae0 sp 00007fff009794e8 error 15 in conftest[600000+1000] [11500.528057] genmodes[29951]: segfault at 608320 ip 0000000000608320 sp 00007fff10bfc488 error 15 in genmodes[608000+1000] elfring@Sonne:~/Projekte/GNU/GCC/erzeugt/4.6.0/Auswahl1/gcc> valgrind --verbose --trace-children=yes --log-file=vg_log48318_%p.txt build/genmddeps /home/elfring/Projekte/GNU/GCC/Quellen/4.6.0/gcc/config/i386/i386.md > tmp-mddeps Speicherzugriffsfehler ... ==394== Process terminating with default action of signal 11 (SIGSEGV) ==394== Bad permissions for mapped region at address 0x607BB0 ==394== at 0x607BB0: ??? (in /home/elfring/Projekte/GNU/GCC/erzeugt/4.6.0/Auswahl1/gcc/build/genmddeps) ==394== by 0x4036D2: read_md_files (read-md.c:1125) ==394== by 0x4012B2: main (genmddeps.c:50) ... elfring@Sonne:~/Projekte/GNU/GCC/erzeugt/4.6.0/Auswahl2/gcc> valgrind --verbose --trace-children=yes --log-file=vg_log48318_%p.txt build/genmodes -h > tmp-modes.h Speicherzugriffsfehler ... ==31666== Process terminating with default action of signal 11 (SIGSEGV) ==31666== Bad permissions for mapped region at address 0x608320 ==31666== at 0x608320: ??? (in /home/elfring/Projekte/GNU/GCC/erzeugt/4.6.0/Auswahl2/gcc/build/genmodes) ==31666== by 0x4E4BBFC: (below main) (in /lib64/libc-2.11.3.so) ... It seems that some files which names will be generated with the prefix "tmp-" have got a "high" probability for unexpected behaviour in the corresponding programs here.