[Bug libc/10071] New: 2.9.90 (2009-04-14) libio/genops.c : __underflow() does not handle NULL FP

["jason dot vas dot dias at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

After building and installing the latest glibc from CVS, 
programs that link to 'libselinux.so' via GTK (ie. because
libgtk-x11-2.0.so.0.1400.8 links to libselinux) get a SEGV
in libio/genops.c:GI__underflow during the CRT startup BEFORE main() is entered.
I recompiled ALL the libraries this app links to afresh from latest SCM source,
but the problem remains: 

$ ldd ./my_gtk_app
        linux-vdso.so.1 =>  (0x00007fffec9fd000)
        libDayGUI.so.1 => /home/jason/DayGUI/libDayGUI.so.1 (0x00007f5fe4185000)
        libgtk-x11-2.0.so.0 => /usr/lib64/libgtk-x11-2.0.so.0 (0x00007f5fe3bad000)
        libgio-2.0.so.0 => /usr/lib64/libgio-2.0.so.0 (0x00007f5fe393a000)
        libgdk-x11-2.0.so.0 => /usr/lib64/libgdk-x11-2.0.so.0 (0x00007f5fe369e000)
        libgdk_pixbuf-2.0.so.0 => /usr/lib64/libgdk_pixbuf-2.0.so.0
(0x00007f5fe3484000)
        libpangocairo-1.0.so.0 => /usr/lib64/libpangocairo-1.0.so.0
(0x00007f5fe3278000)
        libcairo.so.2 => /usr/lib64/libcairo.so.2 (0x00007f5fe2ff4000)
        libpangoft2-1.0.so.0 => /usr/lib64/libpangoft2-1.0.so.0 (0x00007f5fe2dc8000)
        libatk-1.0.so.0 => /usr/lib64/libatk-1.0.so.0 (0x00007f5fe2ba9000)
        libpango-1.0.so.0 => /usr/lib64/libpango-1.0.so.0 (0x00007f5fe2961000)
        libm.so.6 => /lib64/libm.so.6 (0x00007f5fe26e2000)
        libgobject-2.0.so.0 => /usr/lib64/libgobject-2.0.so.0 (0x00007f5fe249f000)
        libgmodule-2.0.so.0 => /usr/lib64/libgmodule-2.0.so.0 (0x00007f5fe229c000)
        libglib-2.0.so.0 => /usr/lib64/libglib-2.0.so.0 (0x00007f5fe1fbc000)
        libfreetype.so.6 => /usr/lib64/libfreetype.so.6 (0x00007f5fe1d36000)
        libfontconfig.so.1 => /usr/lib64/libfontconfig.so.1 (0x00007f5fe1b05000)
        libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f5fe18cd000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f5fe16b9000)
        librt.so.1 => /lib64/librt.so.1 (0x00007f5fe149f000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f5fe1284000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007f5fe1081000)
        libc.so.6 => /lib64/libc.so.6 (0x00007f5fe0d29000)
        libXinerama.so.1 => /usr/lib64/libXinerama.so.1 (0x00007f5fe0b27000)
        libXrandr.so.2 => /usr/lib64/libXrandr.so.2 (0x00007f5fe091f000)
        libXcursor.so.1 => /usr/lib64/libXcursor.so.1 (0x00007f5fe0715000)
        libXcomposite.so.1 => /usr/lib64/libXcomposite.so.1 (0x00007f5fe0513000)
        libXext.so.6 => /usr/lib64/libXext.so.6 (0x00007f5fe0301000)
        libXdamage.so.1 => /usr/lib64/libXdamage.so.1 (0x00007f5fe00ff000)
        libXfixes.so.3 => /usr/lib64/libXfixes.so.3 (0x00007f5fdfefa000)
        libpixman-1.so.0 => /usr/lib64/libpixman-1.so.0 (0x00007f5fdfcb4000)
        libpng12.so.0 => /usr/lib64/libpng12.so.0 (0x00007f5fe4818000)
        libXrender.so.1 => /usr/lib64/libXrender.so.1 (0x00007f5fdfaab000)
        libX11.so.6 => /usr/lib64/libX11.so.6 (0x00007f5fdf772000)
        libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x00007f5fdf557000)
        libXau.so.6 => /usr/lib64/libXau.so.6 (0x00007f5fdf355000)
        libXdmcp.so.6 => /usr/lib64/libXdmcp.so.6 (0x00007f5fdf150000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f5fdef34000)
        libz.so.1 => /lib64/libz.so.1 (0x00007f5fded1f000)
        libexpat.so.1 => /usr/lib64/libexpat.so.1 (0x00007f5fdeaf6000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f5fe4756000)

$ gdb  ./my_gtk_app
GNU gdb 6.8.0.20090412-cvs
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu"...
(gdb) start
Breakpoint 1 at 0x44b181: file R_0.c, line 9021.
Starting program: /home/jason/D/Dupdate_TEST/DG_TEST/Dupdate_DG_TEST
[Thread debugging using libthread_db enabled]
[New Thread 0x7f6b8a1cc790 (LWP 26058)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f6b8a1cc790 (LWP 26058)]
*__GI___underflow (fp=<value optimized out>) at genops.c:361
361       return _IO_UNDERFLOW(fp);
(gdb) where
#0  *__GI___underflow (fp=<value optimized out>) at genops.c:361
#1  0x0000000a00000001 in ?? ()
#2  0x00007fff9232bc20 in ?? ()
#3  0x00007fff9232bc28 in ?? ()
#4  0x0000000000000000 in ?? ()
(gdb) info reg pc
pc: 0x7f6b86755898
(gdb) disass 0x7f6b86755890 0x7f6b86755900
Dump of assembler code from 0x7f6b86755890 to 0x7f6b86755900:
0x00007f6b86755890 <*__GI___underflow+80>:      fadds  (%rax)
0x00007f6b86755892 <*__GI___underflow+82>:      add    %al,(%rax)
0x00007f6b86755894 <*__GI___underflow+84>:      mov    %rbx,%rdi
0x00007f6b86755897 <*__GI___underflow+87>:      pop    %rbx
0x00007f6b86755898 <*__GI___underflow+88>:      mov    0x20(%rax),%r11
0x00007f6b8675589c <*__GI___underflow+92>:      jmpq   *%r11
0x00007f6b8675589f <*__GI___underflow+95>:      nop
(gdb) info reg rax
rax            0x0      0
(gdb)

Somehow, GI__underflow is getting a NULL `_IO_FILE *fp' parameter.

Any ideas anyone ?
TIA, Jason

-- 
           Summary: 2.9.90 (2009-04-14) libio/genops.c : __underflow() does
                    not handle NULL FP
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: jason dot vas dot dias at gmail dot com
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: lx86_64-pc-linux-gnu under linux-2.gcc-4.3.4(2009-04-10)
                    glibc-2
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=10071

------- You are receiving this mail because: -------
You are on the CC list for the bug, or are watching someone who is.