|
From: Peter S. <Pet...@gm...> - 2003-10-16 12:52:00
|
Hello, is the following problem really a valgrind problem (and maybe resolved in the latest snapshot)? I did not read anything about it in the news section, but had the same problem using the new gdb-6.0 version. http://sources.redhat.com/cgi-bin/gnatsweb.pl?database=gdb&user=guest&password=guest&cmd=query And then go to bug number 1406 (the direct link to bug entry was way to long). Peter gdb bug 1406: [...] Description: gdb 5.3 or gdb 6.0 won't display the stack frame [ "Previous frame identical to this frame (corrupt stack?)" ] when is has been invoked by valgrind --gdb-attach=yes. I did not have this problem with gdb 5.2, and it does not seem to be related to a particular valgrind version or gcc version. [...] From the answer As you probably realised, the duplicate frame check isn't the real probelm here. If you look at the backtrace you provided: (gdb) where #0 vg_do_syscall3 (syscallno=4294966784, arg1=3161, arg2=0, arg3=0) at vg_mylibc.c:92 #1 0x40191b7d in vgPlain_system (cmd=0xbffff040 "/usr/bin/gdb -nw /proc/3160/exe 3160") at vg_mylibc.c:1277 #2 0x4018d727 in vgPlain_start_GDB_whilst_on_client_stack () at vg_main.c:1821 #3 0x40194e48 in vgPlain_swizzle_esp_then_start_GDB() from /usr/lib/valgrind/valgrind.so #4 0xbffff0d8 in ?? () #5 0x08048401 in coin () at k.c:5 Previous frame identical to this frame (corrupt stack?) (gdb) There's something rather suspicious about frame #4; I doubt that you're really executing code on the stack. It's defenitely more likely that GDB is unable to properly unwind frame #3. I took a quick look at valgrind, and vgPlain_swizzle_esp_then_start_GDB() is hand-coded assembler that fiddles with the stack. I'm not surprised that GDB chockes on this, and teaching GDB to properly unwind this particular frame is very difficult. It's properly a better idea to ask the author of valgrind to add DWARF Call Frame Info (DWARF CFI) to this particular bit of code. -- NEU FÜR ALLE - GMX MediaCenter - für Fotos, Musik, Dateien... Fotoalbum, File Sharing, MMS, Multimedia-Gruß, GMX FotoService Jetzt kostenlos anmelden unter http://www.gmx.net +++ GMX - die erste Adresse für Mail, Message, More! +++ |